Klaviyo™ is a unified customer platform that gives online brands direct ownership of their consumer data and interactions, empowering them to turn transactions with customers into long-term relationships—at scale. With Klaviyo, brands can combine unlimited customer data with more than 250 native integrations to automate personalized email and SMS communications that make customers feel seen. Klaviyo makes it easy—no need to start from scratch, piece together multiple platforms, or rely on third-party marketplaces and ad networks. From mom-and-pop shops to established companies, innovative brands like Unilever, Taylor Made, Citizen Watches, and more than 90K other paying users leverage Klaviyo to acquire, engage, and retain customers—and grow on their own terms. See our social media community guidelines: www.klaviyo.com/legal/social-terms #Klaviyo

klaviyo

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.Senior Software Engineer, AI &amp; Analytics Data Enablement Location: Boston, MA &nbsp; As a Senior Software Engineer on Klaviyo’s AI &amp; Analytics Data Enablement team, you’ll build and own the data foundations that power our Analytics &amp; AI engine. You’ll design resilient pipelines and analytics models that turn billions of events and domain objects into trusted, actionable insights for Analytics and AI product features. “Your work will help our customers understand the performance of their marketing and power AI &amp; Analytics experiences for our customers.” &nbsp; About the Role &nbsp; You’ll join a cross-functional R&amp;D team focused on the availability, quality, and usability of AI and Analytics data for our customers. In this Senior-level role, you’ll lead complex software and data engineering projects across multi-component systems, from shaping requirements to design, implementation, and long-term operation. You’ll be a go-to expert for AI and analytics data, collaborating with product managers, AI, analytics, and other engineering teams to ensure our data is accurate, observable, and ready to drive insights and enable AI/ML products at scale. &nbsp; You’ll also help evolve our technical standards for data engineering, raising the bar on data modeling, performance, and reliability, while mentoring other engineers on best practices and modern data tooling. &nbsp; What You’ll Do &nbsp; Lead the design and implementation of robust, scalable data pipelines and core tables for Klaviyo. These pipelines are crucial for powering customer facing analytics features and powering AI models to unlock the next stage of Klaviyo's products &nbsp; Partner with Product, Engineering, and AI/ML teams to define clear, consistent metrics and data contracts that align to business goals and product outcomes. &nbsp; Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up for example, using AI to generate tests, detect anomalies, summarize data issues, or accelerate analysis. &nbsp; Mentor other engineers in data engineering best practices, code quality, observability, and system design; contribute to shared libraries, patterns, and tooling that improve developer velocity across R&amp;D. &nbsp; Who You Are &nbsp; 6+ years of software engineering with at least 4 or those being data engineering experience, with a strong track record building and operating data pipelines and analytics models in production. &nbsp; Deep proficiency in large-scale SQL and data modeling for analytics.&nbsp; &nbsp; Strong programming skills in a modern language commonly used for data engineering (e.g. Python), and familiarity with orchestration and transformation tooling (e.g., Airflow, EMR, Spark/pyspark, or equivalents). &nbsp; Experience working with modern data platforms (e.g., columnar data warehouses, object storage) and processing frameworks (batch and/or streaming). &nbsp; Demonstrated ability to lead complex projects spanning multiple components and engineers—driving clarity, making tradeoffs, and delivering measurable impact on reliability, performance, or business outcomes. &nbsp; Comfortable owning systems in production: you think about observability, incident response, incremental rollouts, and long-term maintainability as part of the design. &nbsp; Excellent communication skills; you can explain data tradeoffs and constraints to non-technical partners and influence decisions with clear reasoning. &nbsp; You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. &nbsp; Inclusive, low-ego collaborator who values diverse perspectives and is motivated by helping the team succeed, not just shipping your own code. &nbsp; Nice to Haves &nbsp; Experience in a product-led SaaS environment with large-scale event data &nbsp; Experience in a customer facing data engineering role supports AI/ML features and Analytics Dashboards. &nbsp; Hands-on work with analytics engineering tools and practices (e.g., dbt, metrics layers, semantic models). &nbsp; Experience building near real-time or streaming pipelines for user-facing analytics or monitoring. &nbsp; Domain experience in martech, marketing automation, or customer engagement platforms.Massachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$152,000&mdash;$228,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Senior Software Engineer - Analytics Data Engineering

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.Why You Should Join the Internationalisation Platform Team The i18n Platform team owns all the ways we create, process and deliver internationalisation features for our users at Klaviyo.&nbsp; As a Senior Software Engineer, you will be a key contributor and mentor leading complex, multi-component projects across the i18n platform. You will be involved in how we manage translations, deliver new localisation features, handle multiple currencies, and improve our internationalisation processes. You can look forward to being a part of a highly technical team with significant domain expertise. We oversee tools and services that are leveraged across the organization from the frontend UI to backend data.&nbsp; The team also owns and orchestrates several services to manage the pipeline of translations with our localisation team. As we look toward the next 6-12 months, we aim to focus on delivering LLM workflows to improve our translation capabilities, increase the availability of our Smart Translations product, and develop new features for handling different currencies in multiple regions. &nbsp; Why you should join We foster a culture of psychological safety, collaboration, and work/life balance through flexible hours and structured on-call rotations. We practice a “you make it, you support it” attitude to our products and provide on-call support in case of incidents.&nbsp; We offer compensation for on-call rotations and expect to maintain a very low number of incidents requiring call-out.&nbsp; New engineers are onboarded to the on-call rotation gradually, typically joining the active rotation after their first 6 months and thorough training.We are committed to your growth. You will be paired with a dedicated mentor and given time for focused skill development, including opportunities to attend relevant industry conferences and a growing suite of learning &amp; development opportunities. We enjoy a high degree of autonomy to generate innovative solutions across the entire system, learning directly from customers and suggesting cool new approaches. Free lunch at our Aldgate office three times a weekHighly competitive salary, equity package, and comprehensive health benefits. How You Will Make a Difference You will lead and drive the design and execution of complex, business-critical projects across the Internationalisation platform. You will be responsible for implementing new functionality and establishing design patterns for complex, multi-component systems. You will take full lifecycle ownership of features and projects, driving requirement refinement and setting the pace for all phases of execution. You will proactively collaborate with cross-functional partners to influence product requirements and communicate technical needs to other teams. You will be an active participant in all team processes and accountable for meeting the health and operational excellence (SLOs) of your area of ownership. You will help interview new engineering team members and actively mentor junior engineers in your product area. What we are looking for A strong interest in internationalisation, localisation, and translation. A desire to serve our international customers and expand Klaviyo’s capabilities. 5+ years of demonstrable experience delivering high-quality, customer-facing software. Deep understanding of complex systems (or similar large-scale distributed systems) and strong systems thinking, with a proven ability to scale, observe, and maintain services. Familiarity with full stack development concepts and a strong aptitude to learn. Experience working with both monolithic and microservices architectures Experience with database design that can withstand high query volumes Experience debugging performance issues and improving application performance An interest and aptitude for collaboration across teams and disciplines An understanding of challenges in developing software across multiple languages and catering to non-English speaking users Thrives in a fast paced, customer focused, and strategic environment. A track record of prioritizing the needs and success of the company overall above the immediate needs of the team. Nice to Have Proven experience with large-scale system design and driving the technical/architectural evolution of a product area. Experience with AWS or any similar cloud provider Experience with billing systems in multiple currencies Technologies we use (not exhaustive): React, TypeScript, JavaScript, HTML, CSS Babel, Webpack, Eslint, Prettier REST, GraphQL, JSON Schema, JSON:API CDNs (Fastly, Cloudflare) GitHub, BuildKite MySQL, Redis, Pulsar, Memcache Python, Django, FastAPI, Go, Gin, React, RabbitMQ, Celery, MySQL, DynamoDB, Cassandra, Redis DeepL, Smartling, Stripe Amazon Web Services (EC2, RDS, Aurora, AWS Translate, etc.), Terraform, Kubernetes, Splunk, Chronosphere, Cortex, DX, and other modern DevOps tools Bedrock, Claude, Cursor, LangChain, OpenAI, Gemini, Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE&nbsp; range for your preferred location during the hiring process.Base Pay Range in Local Currency:£88,000&mdash;£132,000 GBPGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Senior Software Engineer, Internationalisation Platform

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.Why You Should Join the Internationalisation Platform Team The i18n Platform team owns all the ways we create, process and deliver internationalisation features for our users at Klaviyo.&nbsp; As a Software Engineer on the team, you will be involved in how we manage translations, deliver new localisation features, handle multiple currencies, and improve our internationalisation processes. You can look forward to being a part of a highly technical team with significant domain expertise. We oversee tools and services that are leveraged across the organization from the frontend UI to backend data.&nbsp; The team also owns and orchestrates several services to manage the pipeline of translations with our localisation team. As we look toward the next 6-12 months, we aim to focus on delivering LLM workflows to improve our translation capabilities, increase the availability of our Smart Translations product, and develop new features for handling different currencies in multiple regions. Why you should join We foster a culture of psychological safety, collaboration, and work/life balance through flexible hours and structured on-call rotations. We practice a “you make it, you support it” attitude to our products and provide on-call support in case of incidents.&nbsp; We offer compensation for on-call rotations and expect to maintain a very low number of incidents requiring call-out.&nbsp; New engineers are onboarded to the on-call rotation gradually, typically joining the active rotation after their first 6 months and thorough training.We are committed to your growth. You will be paired with a dedicated mentor and given time for focused skill development, including opportunities to attend relevant industry conferences and a growing suite of learning &amp; development opportunities. We enjoy a high degree of autonomy to generate innovative solutions across the entire system, learning directly from customers and suggesting cool new approaches. Free lunch at our Aldgate office three times a weekHighly competitive salary, equity package, and comprehensive health benefits. How You Will Make a Difference You will collaborate closely with the team to build the next generation of i18n features for our customers and fellow engineers. You will be responsible for implementing new functionality into complex systems. You will work closely with engineers from other teams across Klaviyo to bring internationalisation processes and features to their code. You will be an active participant in all team processes including standups, backlog refinement, retrospectives, on call, and more. You will help interview new engineering team members as we continue to grow our organization. You will own and deliver features end-to-end, learning to scope and execute small-to-medium-sized projects under the guidance of your mentor. What we are looking for A strong interest in internationalisation, localisation, and translation. A desire to serve our international customers and expand Klaviyo’s capabilities. 2-5 years of experience in a software engineering discipline (We are keen to support growth for candidates at the lower end of this range). Familiarity with full stack development concepts and a strong aptitude to learn. Experience working with both monolithic and microservices architectures Experience with database design that can withstand high query volumes Experience with CI/CD pipelines Experience debugging performance issues and improving application performance An interest and aptitude for collaboration across teams and disciplines An understanding of challenges in developing software across multiple languages and catering to non-English speaking users Thrives in a fast paced, customer focused, and strategic environment. Nice to Have Experience creating new services with scalability in mind. Exposure to large-scale system design Experience with AWS or any similar cloud provider Experience with billing systems in multiple currencies Technologies we use (not exhaustive): React, TypeScript, JavaScript, HTML, CSS Babel, Webpack, Eslint, Prettier REST, GraphQL, JSON Schema, JSON:API CDNs (Fastly, Cloudflare) GitHub, BuildKite MySQL, Redis, Pulsar, Memcache Python, Django, FastAPI, Go, Gin, React, RabbitMQ, Celery, MySQL, DynamoDB, Cassandra, Redis DeepL, Smartling, Stripe Amazon Web Services (EC2, RDS, Aurora, AWS Translate, etc.), Terraform, Kubernetes, Splunk, Chronosphere, Cortex, DX, and other modern DevOps tools Bedrock, Claude, Cursor, LangChain, OpenAI, Gemini, Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE&nbsp; range for your preferred location during the hiring process.Base Pay Range in Local Currency:£68,000&mdash;£102,000 GBPGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Software Engineer, Internationalisation Platform

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.At Klaviyo, Product Managers have mastered the craft of product management. They are highly skilled practitioners who have driven significant business outcomes, and they thrive in a high-growth environment that offers unlimited potential. As a Senior Product Manager, you’ll not only be responsible for delivering impact through your own work, but you’ll also mentor the next generation of product leaders.&nbsp;Please note that this is a hybrid role that requires 3 days/week in our Boston office. Fully remote candidates will not be considered at this time.&nbsp; About the Team: Klaviyo’s Data Infrastructure pillar is responsible for maintaining a centralized, scalable data store with flexible, low-latency reads for all of an organization’s customer and related data. As part of this team, you’ll play a critical role in ensuring our integrations empower merchants to grow faster and connect seamlessly across systems. This role focuses on owning the product strategy, execution, and business results for Klaviyo’s first-party integrations with self-hosted eCommerce platforms — specifically Magento 2, Salesforce Commerce Cloud (SFCC), WooCommerce, and PrestaShop. You’ll build enterprise-grade, reliable integrations that directly impact revenue, upmarket growth, and merchant success. Senior Product Managers at Klaviyo are measured by the outcomes they drive. In this role you’ll: Deliver business impact by setting and executing a roadmap that advances our integrations and drives measurable results. Champion customer needs by spending significant time with merchants and partners, building a deep understanding of their workflows and challenges. Think deeply and analytically to break down complex problems, explore multiple solutions, and ensure every edge case is addressed. Communicate exceptionally well in writing and verbally, ensuring clarity across all stakeholders. Lead by example as a mentor and coach, raising the bar for other PMs on the team. What You’ll Do: Collaborate across product, engineering, research, design, sales, partnerships, and external stakeholders to deliver high-impact outcomes. Own and prioritize the roadmap for self-hosted integrations, focusing on the projects with the greatest business impact. Write detailed specifications that anticipate use cases, solve problems elegantly, and leave no ambiguity. Ship features quickly and iteratively, getting value into customers’ hands while continuing to improve. Mentor other product managers, sharing your experience and raising the overall standard of product excellence. Continuously learn and dive deep into new areas, becoming an expert in self-hosted eCommerce platforms and extensibility. Who You Are: 5-7+ years of product management experience, ideally with technical products or infrastructure. Proven track record of owning products end-to-end and delivering measurable business outcomes. Strong technical expertise in system integrations (REST APIs, webhooks, authentication, data pipelines, cloud architecture). Experience with products where extensibility is a core requirement, enabling customization and integrations across ecosystems. Background working with enterprise/upmarket merchants, mapping technical and business requirements across multi-system environments. Experience collaborating with external partners and aligning on joint strategic priorities. Passionate about building B2B SaaS products, with a hustler mindset, resourcefulness, and bias toward action. Exceptional written and verbal communication skills. Nice to Have: Familiarity with extensions and plugins, especially in the eCommerce space. Experience with internationalization and how it affects integrations and content. Your First 90 Days In your first 30 days, you will get acclimated to Klaviyo and our product: During the first two weeks, you will be immersed in an onboarding program that introduces you to the company and the product. Spend time in Support, helping customers work through issues.&nbsp; There’s no better way to get a holistic understanding of the product, and to get to know our customers. Be introduced to everyone you will need to know in order to be successful in your role. In your first 60 days, you will become a valuable member of the team: Take ownership of a key area of the product, and become the go-to expert for that area. Have a quick impact by spec’ing and building your first product features. In your first 90 days, you will continue to increase your influence: Formulate the strategy and roadmap for your product area. Start contributing to knowledge sharing with the larger product team.&nbsp; We value learning and growth very highly. Start coaching and mentoring other Product Managers at Klaviyo, helping them benefit from your experience and knowledge. &nbsp; We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025. Please see the independent bias audit report covering our use of Covey hereMassachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$140,000&mdash;$210,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Senior Product Manager - Self-Hosted Ecommerce Integrations

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building, owning &amp; scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone, learn new technologies and work hard to ensure each day is better than the last. Klaviyo operates a real-time data platform built for massive scale on Amazon Web Services (AWS). Engineers come to Klaviyo with experience in a variety of languages and from a number of disciplines. **This role is based in Boston and requires working onsite three days per week** Your role with this team The Profiles, Identity, and Consent teams are responsible for processing and storing profile-related data at Klaviyo. This data represents Klaviyo’s customers’ own customers (known as profiles) and the reachability of those profiles across all messaging channels. We work closely with teams responsible for segmentation, messaging channels, data warehousing, data exchange, etc. to make this data available throughout Klaviyo to support Klaviyo’s core product capabilities. We store tens of billions of records around a billion reads and writes against those records every day. &nbsp; This team is a key contributor to the evolution of Klaviyo’s data platform, bridging the gap between foundational platform capabilities and critical customer-facing business logic within Klaviyo’s product suite.&nbsp; &nbsp; As an engineer on this team, you will be responsible for designing, building, and maintaining systems to support core product areas in Klaviyo. You will work with a cross functional team to help refine feature specifications, write technical design documents, create system infrastructure, write high quality code, and operate large scale systems in production. You will partner with others on the team to review technical designs and code, and provide technical mentorship to other engineers on the team and in the broader engineering organization. Team tech stack We’re looking for a backend-focused engineer. You’ll be working with the following tech stack: Python, Django Aurora MySQL, ProxySQL, Redis Apache Kafka, Pulsar, Spark, Iceberg, and other tech from the big data stack Graphite, statsd AWS, Terraform, Docker, Kubernetes, Buildkite, and other modern DevOps tools Required skills Must have 4+ years of experience in a software engineering discipline Strong programming skills in at least one modern language Experience building backend, service-oriented applications Experience with queuing and/or streaming systems (e.g., SQS, RabbitMQ, Kafka) Foundational understanding of distributed systems Able to communicate well, both verbally and in writing Able to work with others on a team Able to learn continuously and adapt to a high growth environment Able to stick with and solve difficult problems BA or BS Degree in Computer Science, related field, or equivalent experience Massachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$120,000&mdash;$180,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Software Engineer II - Profiles, Identity, Consent

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.About the Role Klaviyo is looking for a Full Stack Engineer to support key initiatives that enhance our product offerings and drive company growth. In this role, you'll play a critical part in delivering end-to-end solutions using both front-end and back-end technologies. You’ll improve existing products and develop new capabilities that push the boundaries of what’s possible for our customers. As a Software Engineer II, you’ll tackle complex challenges, explore multiple solutions, and weigh business and technical trade-offs to determine the best path forward. You’ll actively contribute to team discussions and help shape important technology decisions. You'll also be responsible for shipping well-designed, thoroughly tested solutions that prioritize reliability and performance. The WhatsApp team builds the end-to-end experience for Klaviyo’s WhatsApp channel, making it easy and powerful for customers to use our newest messaging channel effectively. We own the core WhatsApp product surface across Klaviyo, ensuring it’s available wherever customers expect it, while building and operating WhatsApp-specific capabilities like outbound and inbound pipelines and Meta template management. We work cross-functionally by default. Partnering closely with teams across the org gives us broad exposure to the product, lets us unblock other teams, and allows us to drive impact well beyond our immediate scope. The work is fast-moving, varied, and forces us to constantly learn and adapt. Looking ahead, our focus is on scaling WhatsApp across Klaviyo. That means closing feature gaps, rapidly integrating new Meta capabilities, and running targeted adoption experiments to drive usage. The goal is simple: deliver the most complete, high-quality WhatsApp integration in the market—and set the bar for what a marketing platform can do with this channel What We’re Looking For A proven track record of building high-quality products and systems, with a focus on writing clean, maintainable code 3+ years of experience in a software engineering role Experience building end-to-end software solutions or deep experience with both front-end and back-end technologies Familiarity with code reviews and leading or participating in robust testing practices Experience working in agile, fast-paced environments Nice to Have Experience with Python and related technologies Experience with React and related technologies Background in digital marketing or customer data software Exposure to machine learning concepts or applications Experience building cloud-native solutions, ideally on AWS &nbsp; We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025. Please see the independent bias audit report covering our use of Covey hereMassachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$120,000&mdash;$180,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Software Engineer II - WhatsApp

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.About the team When you hear billing, chances are you might think of a dusty corner office with several decade old file cabinets. Klaviyo’s Billing &amp; Monetization team is not that! We oversee the payments and enforcement infrastructure that allow hundreds of thousands of companies to send billions of emails and text messages on BFCM weekend. The team is responsible for tracking all product usage to bill customers, managing customer subscriptions and payments, and pricing for new and existing products. As Klaviyo continues to scale, our team will play an instrumental role in capturing revenue (both domestic and international), building features that help users understand where their dollar spend goes, complying with regulatory requirements, facilitating internationalization and assisting in all pricing related changes at Klaviyo. About the role The Billing &amp; Monetization team is seeking a Senior Software Engineer to help drive Klaviyo forward in its mission to offer entrepreneurs the best possible tooling at the lowest possible price. You will drive outcomes and decisions directly related to Klaviyo’s growth in international markets, its relationship with large customers with multiple subsidiaries and unique payment requests, how new products are priced and packaged and more. How you’ll make an impact Own customer facing products that help customers better understand how they are billed on Klaviyo.&nbsp; Develop new approaches to track billions of product usage events accurately and reliably. Work with Klaviyo customers and stakeholders to build a platform that maximizes value for our customers and for Klaviyo.&nbsp; Make decisions and own outcomes around infrastructure, application logic, documentation, product changes, UI and more What we’re looking for: You have a track record of building high quality products and systems. You take pride in writing clean, high quality code.&nbsp; 4+ years of experience as a software engineer Previous experience RESTful APIs, pub/sub systems, and 3rd party integrations&nbsp; You have some experience developing full stack products.&nbsp; Experience working on team projects and/or leading projects.&nbsp; Nice to have: Experience building payment systems and or integrating with payment providers. Experience working with cross functional teams on bringing products to market, financial reconciliation, etc&nbsp; Passion for understanding and experimenting with the levers that drive business outcomes, including pricing, presentation, vendor relationships and more. Experience talking to customers and listening deeply to their wants and needs. Technologies we use (no experience necessary) We currently use the list of technologies below but are always looking to find the best tools for the jobs that help our customers (and very open to adding technologies given the right circumstances). We don’t expect you to have any experience in the tools below and we will provide whatever training you need to level up and succeed! Our current tech stack: Python, Django, React, Typescript Kafka, Celery MySQL, Redis, Memcached AWS (EC2, RDS, Aurora, S3, etc.), Kubernetes, Terraform, Jenkins Massachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$120,000&mdash;$180,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Software Engineer II - Billing

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.Why You Should Join the UCM Team: The UCM (Unified Communication Management) team sits at the core of how Klaviyo delivers messages to customers at massive scale. We own the systems responsible for sending, routing, and processing billions of messages across channels, making UCM a critical pillar of Klaviyo’s platform and customer experience. Our work directly impacts deliverability, reliability, and performance for some of the most business-critical workflows at Klaviyo. As a Lead Software Engineer on the UCM team, you’ll lead a group of engineers building and operating high-throughput, distributed systems that power message delivery end-to-end. You’ll work deeply in a microservices-oriented architecture, designing resilient, scalable infrastructure that operates at global scale. This is a hands-on leadership role where you’ll contribute to system design, implementation, and technical strategy while mentoring engineers and setting the technical direction for the team. This role offers a unique opportunity to lead one of Klaviyo’s most foundational platforms—the systems that every message flows through. Your work will shape how we scale globally, improve reliability and performance, and enable faster innovation across product teams. If you’re excited about solving complex distributed systems problems and leading a team at the heart of Klaviyo’s messaging ecosystem, UCM is the place to do it. How You Will Make a Difference: Lead a team of engineers building and evolving Klaviyo’s core messaging and communication platform Own message ingestion, routing, processing, and delivery pipelines that handle billions of messages at scale Build and operate highly available, distributed systems that support global traffic, reliability, and performance Contribute directly to system architecture and code, driving best practices in scalability, resilience, and operational excellence Collaborate closely with product, infrastructure, and partner teams to enable new channels, use cases, and platform capabilities Grow and mentor engineers while helping shape the future of Klaviyo’s messaging infrastructure Transform messaging workflows by putting AI at the center, enabling smarter routing, optimization, and operational decision-making from the ground up Who You Are: 8+ years of engineering experience with strong backend skills (Python or Go or Similar) Comfortable coding and reviewing complex systems — this is a hands-on role Skilled in system design and scaling infrastructure using AWS Experience building developer platforms or internal tooling is a strong plus Clear communicator and collaborative team player You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Technologies We Use: Python, Go AWS, Terraform, Redis, MySQL KDS, MKS, Redshift Location: This is a hybrid role based in Boston, with 3 days in office and 2 days remote per week. &nbsp; We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025. Please see the independent bias audit report covering our use of Covey hereMassachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$188,000&mdash;$282,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Lead Software Engineer - Sending Platform

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.Why You Should Join the Developer Infrastructure Team Our core focus is empowering engineers to ship code efficiently and safely. We own the CI/CD pipelines and infrastructure automation that drastically improves developer productivity. As the Lead for this team, you will define the technical roadmap for the software pipeline from idea to delivery, enabling every engineer in the company to ship at terminal velocity with total confidence. By building the foundational tools that streamline the path to production, you will play a pivotal role in maximizing developer throughput, minimizing deployment friction, and ensuring our organization can move fast without the fear of breaking things. What You'll Achieve: Key Responsibilities As the technical leader for this team, you will drive the evolution of our CI/CD pipeline to enable fast, seamless development and deployments across the organization: Define Architectural Vision: Lead the long-term strategy for our CI/CD pipelines and frameworks across both backend and frontend stacks. You will ensure these systems are not just reliable, but world-class in their ease of adoption. CI/CD Strategy: Architect how we execute fast, reliable deployments and rollbacks. You will own the end-to-end delivery pipelines, ensuring the highest standards of security, efficiency, and compliance from code commit to production. Set Engineering Standards: Establish the standards for our repositories. You will define the benchmarks for PRs, cycle time, velocity, code quality metrics, and systemic reliability that all teams will follow. Scalable Tooling &amp; Coverage: Design and build the next generation of tools that simplify CI/CD pipelines. You will lead efforts to help bring all teams and repos up to best in class standards at scale . AI-Driven Strategy: Spearhead our efforts to leverage AI within the CI/CD lifecycle as well as using AI to accelerate our own development efforts.&nbsp; Cross-Functional Leadership: Act as a consultant to feature teams to solve their most complex engineering challenges. You will use root-cause analysis from major incidents to propose and implement pillar-wide velocity improvements. Operational Excellence: Oversee the health and performance of our entire CI/CD pipeline, taking ultimate responsibility for the stability of the environment that hundreds of engineers rely on daily. What Makes This Role Exciting High-Leverage Leadership: You are not just building features; you are building the platform that defines the developer experience for the entire company. Innovation at the Edge: You will have the autonomy to experiment with emerging technologies like AI and LLMs to solve the age-old problems of flakiness and slow feedback loops. Pillar-Wide Influence: As a Lead, your decisions on testing standards and infrastructure will directly impact the speed and quality of every shipping team in the organization. Who You Are:&nbsp; Seasoned Technical Leader: You have 7+ years of software engineering experience with a history of leading complex, high-impact technical projects. You are a hands-on lead who stays close to the code while steering the broader vision. Master of Root-Cause Analysis: You don't just fix symptoms; you hunt down systemic failures. You excel at debugging deep-stack issues and transforming those lessons into automated preventions. Full-Stack Architect: You are comfortable designing systems across the stack. Whether it is a React-based quality dashboard or a Python service for data seeding, you understand how to build for scale. AI Visionary: You are passionate about the intersection of AI and Software Quality. You have a clear perspective on how AI can automate the mundane parts of testing and accelerate the SDLC. You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Extreme Ownership: You take pride in the end-to-end health of the platform. You are proactive in identifying technical debt and are a relentless advocate for engineering excellence. CI/CD Expert: You have deep experience with modern CI/CD tools and a sophisticated understanding of how to integrate automated testing into high-frequency deployment pipelines. Technologies we use (not exhaustive): Backend: Python, Django, Go Frontend: React, TypeScript, JavaScript Testing Frameworks: Playwright, Cypress, Pytest, Jest Infrastructure and CI: AWS, Kubernetes, Terraform, Helm, Buildkite Data: MySQL, Redis, Kafka AI Tools: Integration with Claude, Cursor, Copilot, or internal AI enablement frameworks &nbsp;Massachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$176,000&mdash;$264,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

Lead Software Engineer - CICD Tooling

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.About Klaviyo Klaviyo is a leading marketing automation platform that helps businesses grow by delivering personalized experiences. Our mission is to empower creators to own their destiny. We believe in providing an exceptional developer experience that enables our engineering teams to build and ship high-quality software efficiently and with confidence. About the Team The Developer Infrastructure team at Klaviyo is at the heart of our engineering organization, dedicated to accelerating Klaviyo development. We build and maintain the tools and processes that allow engineers to maximize their focus on business objectives by minimizing time spent on build and deployment systems, foundational software "building blocks," and development environments. We are committed to fostering open communication and collaboration with our internal customers – the engineers. As a Senior Lead Software Engineer within the Dev Infrastructure pillar, you will serve as the primary technical architect for our Dependencies and Platform domain while driving the overarching technical vision for the entire Dev Infra group. You will partner with leaders across CI/CD, Web Platform, Environments, Quality Tools &amp; Testing and AI Enablement to ensure a cohesive infrastructure strategy, acting as a key technical liaison to the broader Core Infra organization. Your leadership will ensure that our core systems, dependency lifecycles, and platform upgrades are not just maintained, but architected to accelerate engineering velocity across the entire company. What You'll Do As a Senior Lead Software Engineer, you will have an overarching responsibility for the architecture, health, and dependencies for the Klaviyo code base with a focus on the backend. Your role will involve: Technical Strategy: Define technical strategy within the scope of the Klaviyo backend and execute to improve the area's architecture, products, infrastructure, and processes.&nbsp; Strategic Planning and Architecture: Define the technical vision and architectural roadmap for the platform, ensuring all upgrades and dependency management align with long-term business goals for scalability, reliability, and security. Dependency Management: Lead efforts to determine, analyze, and optimize backend and third-party dependencies, ensuring they are secure, performant, and reliable. This includes establishing frameworks for risk assessment and contingency planning related to dependencies. Platform Upgrades and Rollouts: Oversee and assist with the planning and seamless rollout of major software releases and updates, managing the entire lifecycle from design to deployment in production environments including significant individual contributions. Enhance Developer Productivity: Drive initiatives to improve platform cycle time metrics across the board, including PR CI Speed, Human Code Review Pickup Time, and Commit Velocity by Repo. This involves a relentless focus on reducing toil and increasing engineering efficiency. Mentorship: Mentor other engineers regularly, primarily experienced lead and senior engineers. Ensure others in the area are developing skills they need to improve within the organization. Problem Solving and Reliability: Act as a go-to expert for diagnosing and resolving complex performance, scalability, and reliability issues across the platform. Implement proactive monitoring and telemetry to identify and address problems before they become critical incidents. Cross-functional Collaboration: Partner with product managers, security teams, hardware engineers, and other stakeholders to gather requirements, resolve conflicts, and ensure alignment across all teams and projects. Continuous Improvement: Stay current with emerging technologies and industry trends, evaluating new tools and practices to identify how they can improve systems and internal processes.&nbsp; Who You Are 12 years of experience in software development, strong knowledge of computer science fundamentals, domain-driven design, and extensive expertise in architectural patterns, specifically within the domain of distributed systems. BA or BS Degree in Computer Science, related field, or equivalent experience. Technical Expertise: Deep expertise in relevant programming languages (e.g., Go, Python) and cloud platforms (AWS, Azure, GCP), containerization (Kubernetes, Docker), and Infrastructure as Code (Terraform). Technical Strategy: Demonstrated experience in contributing to the product and platform vision, as well as defining the strategy within the broader scope of long-term organizational needs. Architectural Skills: Strong understanding of software architecture, design patterns, and system integration, with the ability to define technical strategies and influence architectural decisions across multiple teams. Soft Skills: Exceptional problem-solving, analytical, leadership, and communication skills, with the ability to articulate complex technical concepts to both technical and non-technical audiences. AI Enthusiast: You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Nice to Have Experience with specific tools such as Pants, FastAPI, Django, React, Terraform, Buildkite. Background in performance optimization Familiarity with complex data management for testing, including large datasets and production-like data replication. &nbsp; Our Tech Stack Python, Django, FastAPI Apache Kafka, Apache Pulsar, RabbitMQ, Spark, Airflow, and other tech from the big data stack MySQL, PostgreSQL, Clickhouse, Redis Typescript, React, Babel, Jest, Webpack Graphite, statsd, Chronosphere AWS, Terraform, Docker, Kubernetes, Pantsbuild, Argo, and other modern DevOps tools Massachusetts Applicants:It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.&nbsp; Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.Base Pay Range For US Locations:$216,000&mdash;$324,000 USDGet to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.&nbsp; By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our&nbsp;Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our&nbsp;Job Applicant Privacy Notice. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. &nbsp; By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.&nbsp; If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.&nbsp; You can find our Job Applicant Privacy Notice&nbsp;here&nbsp;and here (FR). &nbsp;

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