Sezzle (ASX: SZL) is a fintech company founded in 2016 that is revolutionizing the way consumers make payments. By offering interest-free installment plans at online stores, Sezzle is empowering shoppers to budget their purchases effectively while providing retailers with a tool to increase sales and customer loyalty. With a mission to financially empower the next generation, Sezzle is changing the landscape of online shopping and payment solutions.

sezzle

The salary range for this role is $5,000 - $9,500 per month (Gross in USD)&nbsp;
About Sezzle:
With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!
Compensation:
For this senior development role, with 8+ years of experience, the compensation range is $5,000 - $9,500 &nbsp;USD per month. This range acknowledges the extensive expertise, leadership capabilities, and significant contributions expected at this level, offering a competitive salary to reflect the value of advanced skills and experience.
About the Role:&nbsp;
We are seeking a talented and motivated Senior Software Engineer who is best in class with a high IQ plus a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement. As a Senior Software Engineer with Sezzle, you will work with a highly-motivated team to tackle interesting and challenging problems across multiple areas of the organization. Your experience and guidance will help other members of the team level-up their own skills as well.
In this backend focused role, you will work closely with stakeholders from Product, Support and the business. You’ll also partner with other engineering teams to provide high-quality, scalable, and innovative solutions to internal and customer problems. Your day-to-day responsibilities will include designing, developing, and delivering new features, as well as unblocking and mentoring your teammates.
This role has both an internal and external focus, your contributions will make a meaningful difference in the day-to-day lives of your peers at Sezzle, enhancing their ability to support our business and customers, and you will have opportunities to take any feedback and iterate.
Interview Process
We believe transparency is important at Sezzle. Regularly providing feedback while setting expectations is part of our culture starting with the interview process. Advancement through each step is not guaranteed.
<ul>
<li>Application submitted (you are here)</li>
<li>Cognitive test (12 min)</li>
<li>Coding assessment (~1.5 hours)</li>
<li>Interview with recruiters (30 min)</li>
<li>Interview with engineers (1 hour)</li>
<li>Interview with engineering leadership (30-45 min)</li>
<li>Offer!</li>
</ul>
What you'll do:&nbsp;
<ul>
<li>Design software applications and features in Golang and React</li>
<li>Help build out a distributed architecture, creating solutions that work within it, maintaining consistency while scaling highly</li>
<li>Coordinate with internal company stakeholders to design market winning products</li>
<li>Develop and collect metrics to drive continuous improvement of existing products</li>
<li>Deliver high quality features which can be tested and adheres to reporting standards</li>
<li>As needed, lead small development teams to bring a project to market</li>
<li>Mentor other engineering teammates to help elevate their experience and knowledge</li>
</ul>
What We Look For:&nbsp;
<ul>
<li>At least 7 years of full-stack software engineering experience</li>
<li>Experience bringing new ideas and building consensus on the path forward</li>
<li>Experience with building and serving REST APIs using Go (preferably) and Java Python or a similar language.</li>
<li>Experience working in a distributed, cloud-based architecture, with either design patterns like transactional outboxes, or queuing tools like RabbitMQ, SQS, Kafka</li>
<li>BS in Computer Science or similar degree.</li>
</ul>
Preferred Knowledge and Skills:
<ul>
<li>Experience with SQL based RDMS through an ORM tool</li>
<li>Comfortable using observability platforms like Prometheus, or vendor solutions like NewRelic or Datadog to instrument your code for production monitoring and alerting.</li>
<li>DevOps experience with CI/CD pipelines</li>
<li>Familiarity with containerized micro-service architecture deployed with Kubernetes on AWS</li>
<li>Demonstrated history of delivering commercial APIs and web applications</li>
<li>A clear record of getting products to market and prioritizing solutions and improvements based on stakeholder/customer feedback.</li>
</ul>
About You:&nbsp;
<ul>
<li>You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.</li>
<li>You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things</li>
<li>You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.</li>
<li>You earn trust - you listen attentively, speak candidly, and treat others respectfully.</li>
<li>You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly.</li>
<li>You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle.</li>
</ul>
Sezzle’s Technology Stack:
<ul>
<li>Languages: Golang, Typescript, Python</li>
<li>Frontend: Typescript - React and React Native</li>
<li>Backend: Golang</li>
<li>Database: MySQL, Postgres, Elasticsearch</li>
<li>DevOps &amp; Cloud: AWS, Kubernetes</li>
<li>Version Control: Git</li>
<li>CI/CD: Gitlab</li>
<li>Testing: Developer-driven, focus on automated unit, integration, and end-to-end tests</li>
<li>Sezzle is focused on using open source, and we build what we can before buying!</li>
</ul>
What Makes Working at Sezzle Awesome?&nbsp;
At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators; we are skilled musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers. We believe in surrounding ourselves with not only the best and the brightest individuals, but those that are unique and purpose-driven in all that they do. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.&nbsp;
#Li-remote #Full-time

Senior Software Engineer (Argentina)

The salary range for this role is $1,500 - $4,000 per month (Gross in USD)&nbsp;
About Sezzle:
With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!
About the Role:
We are seeking a talented and motivated&nbsp;Junior Software Engineer with a unique blend of&nbsp;accounting experience&nbsp; who is best in class with a high IQ plus a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement.&nbsp;This role is tailored for professionals who started their careers in accounting but pivoted to engineering and now want to leverage their domain expertise to solve technical challenges in fintech.&nbsp;This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement. The Junior Software Engineer will assist us with the design, development, and installation of software solutions. Your duties will include development, writing code, and documenting functionality. You should be able to build high-quality, innovative and fully performing software in compliance with coding standards and technical design.
Interview Process
We believe transparency is important at Sezzle. Regularly providing feedback while setting expectations is part of our culture starting with the interview process. Advancement through each step is not guaranteed.
<ul>
<li data-stringify-indent="0" data-stringify-border="0">Application submitted (you are here)</li>
<li data-stringify-indent="0" data-stringify-border="0">Wonderlic test (30-40 min)</li>
<li data-stringify-indent="0" data-stringify-border="0">Coding assessment (~1.5 hours)</li>
<li data-stringify-indent="0" data-stringify-border="0">Interview with recruiters (30 min)</li>
<li data-stringify-indent="0" data-stringify-border="0">Interview with engineers (1 hour)</li>
<li data-stringify-indent="0" data-stringify-border="0">Interview with engineering leadership (30-45 min)</li>
<li data-stringify-indent="0" data-stringify-border="0">Offer!</li>
</ul>
Sezzle Technical Stack:
<ul>
<li>Golang backend, React / React Native front-end</li>
<li>Grafana / Loki / Prometheus metrics</li>
<li>Kubernetes</li>
<li>AWS</li>
<li>Amazon Aurora (MySQL) RDS</li>
<li>Gitlab CI/CD deployments</li>
<li>Unit, Integration, and end-to-end testing</li>
</ul>
What You'll Do:
<ul>
<li>Collaborate with cross-functional teams to enhance and maintain software solutions for financial processes.</li>
<li>Be an integral part of the software development lifecycle.</li>
<li>Work as an integrated team member developing new features.</li>
<li>Leverage accounting background to identify gaps and&nbsp;improve automation and reconciliation workflows.</li>
<li>Evaluate and deploy software tools, processes, and metrics.</li>
<li>Provide support and consulting on software systems usage.</li>
<li>Ensure compliance with project plans and industry standards.</li>
</ul>
What We Look For:
<ul>
<li>Prior experience as an accountant or financial analyst.</li>
<li>Solid understanding of financial operations such as&nbsp;reconciliation, reporting, and compliance.</li>
<li>Proficient in at least one programming language (e.g., Python, Java, Go) and familiar with database systems like MySQL or PostgreSQL.</li>
<li>Experience with backend API development.</li>
<li>Experience with relational database storage and retrieval.</li>
<li>Familiarity with software engineering tools, software development methodology, and release processes.</li>
<li>Demonstrated experience working with Claude or equivalent large language model tools is required; candidates must be comfortable leveraging AI to enhance productivity, research, and communication.</li>
<li>Bachelor’s degree in Accounting, Computer Science, or a related field.</li>
</ul>
Sezzle’s Technology Stack:
<ul>
<li>Languages:&nbsp;Golang, Typescript, Python</li>
<li>Frontend:&nbsp;Typescript - React and React Native</li>
<li>Backend:&nbsp;Golang</li>
<li>Database:&nbsp;MySQL, Postgres, Elasticsearch</li>
<li>DevOps &amp; Cloud:&nbsp;AWS, Kubernetes</li>
<li>Version Control:&nbsp;Git</li>
<li>CI/CD:&nbsp;Gitlab</li>
<li>Testing:&nbsp;Developer-driven, focus on automated unit, integration, and end-to-end tests</li>
<li>Sezzle&nbsp;is focused on using open source, and we build what we can before buying!</li>
</ul>
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<div class="flex w-full flex-col gap-1 empty:hidden first:pt-[3px]">
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About You:
<ul>
<li>You have relentlessly high standards&nbsp;- many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.</li>
<li>You’re not bound by convention&nbsp;- your success—and much of the fun—lies in developing new ways to do things</li>
<li>You need action&nbsp;- speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.</li>
<li>You earn trust&nbsp;- you listen attentively, speak candidly, and treat others respectfully.</li>
<li>You have backbone; disagree, then commit&nbsp;- you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly.</li>
<li>You deliver results&nbsp;- you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle.</li>
</ul>
What Makes Working at Sezzle Awesome:
At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators. We believe in surrounding ourselves with only the best and the brightest individuals. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.&nbsp;
</div>
</div>
</div>
</div>
#Li-remote #Full-time

Junior Software Engineer with Accounting Experience (Peru)

<h3>Software Engineer Intern</h3>
Job Title: Software Engineer Intern Location: Remote / Peru
About Sezzle:
Sezzle is a cutting-edge fintech company dedicated to financially empowering the next generation. Through our payment platform, we provide interest-free installment plans to consumers, driving sales for thousands of eCommerce merchants. Our mission is to bridge the gap between consumers' needs and modern payment solutions.
About the Role:
We are seeking a passionate Software Engineer Intern to join our innovative technology team. This is a great opportunity to gain hands-on experience and work within a highly skilled group of developers to build and maintain features for Sezzle’s platform. As a Software Engineer Intern, you’ll contribute to real-world projects, participate in code reviews, and gain exposure to Sezzle’s technology stack.
What You'll Do:
<ul>
<li>Assist in developing and maintaining backend and frontend services.</li>
<li>Write clean, scalable code and participate in code reviews.</li>
<li>Collaborate with the engineering team to implement new features and resolve bugs.</li>
<li>Work on performance tuning, debugging, and scaling of Sezzle's platform.</li>
<li>Document software functionalities and contribute to the knowledge base.</li>
</ul>
Sezzle’s Technology Stack:
<ul>
<li>Languages: Golang, Typescript, Python</li>
<li>Frontend: Typescript - React and React Native</li>
<li>Backend: Golang</li>
<li>Database: MySQL, Postgres, Elasticsearch</li>
<li>DevOps &amp; Cloud: AWS, Kubernetes</li>
<li>Version Control: Git</li>
<li>CI/CD: Gitlab</li>
<li>Testing: Developer-driven, focus on automated unit, integration, and end-to-end tests</li>
<li>Sezzle is focused on using open source, and we build what we can before buying!</li>
</ul>
What We Look For:
<ul>
<li>Experience with Golang, Python, or any backend language.</li>
<li>Familiarity with Javascript/Typescript, and React or similar framework.</li>
<li>Basic understanding of databases and SQL.</li>
<li>Eagerness to learn and adapt to new technologies quickly.</li>
<li>Problem-solving mindset and attention to detail.</li>
<li>Demonstrated experience working with Claude or equivalent large language model tools is required; candidates must be comfortable leveraging AI to enhance productivity, research, and communication.</li>
</ul>
About You:
<ul>
<li>You are curious, eager to learn, and not afraid to ask questions.</li>
<li>You are passionate about technology and eager to develop your skills.</li>
<li>You enjoy working collaboratively and contributing to a fast-paced team.</li>
<li>You have a strong desire to solve complex problems.</li>
</ul>
What Makes Working at Sezzle Awesome:
At Sezzle, you’ll be part of a dynamic team, work on real-world fintech solutions, and get mentorship from experienced engineers. We offer flexible working conditions, making it an ideal internship for motivated students or graduates who want to kickstart their tech careers.
Compensation: The salary for the Software Engineer Intern is 800 USD monthly gross.&nbsp;
#Li-remote #Full-time

Software Engineer Intern

The salary range for this role is $5,000 - $8,000 per month (Gross in USD)&nbsp; 
About Sezzle: With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!
About the Role: We are seeking a talented and motivated Senior Technical Product Manager who is best in class with a high IQ plus a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement.
Sezzle is building the platform that will carry us from a BNPL provider into a full-stack financial institution. This role owns the system at the center of that: Sezzle’s banking core — the ledger, accounts and balances, and the money movement that every future Sezzle financial product will run on.
You would own it end to end. Discovery, architecture and vendor decisions, requirements, build, launch, and everything after — not a slice of someone else’s roadmap, but the full product lifecycle for the platform itself. You’d work directly with Engineering, Finance, Compliance, Treasury, and Risk, with real authority over how this gets built.
Ideally you’ve built something like this before. If you haven’t, but you’ve owned a ledger, a payments platform, an issuing program, or other financial infrastructure — and you’re the kind of person who learns a domain properly rather than around the edges — we want to talk to you. What matters most is that you’ve owned real infrastructure and that you’re willing to go deep on the parts you don’t know yet.
What You'll Do:
<ul>
<li>Own the banking platform roadmap. Define and sequence the platform work required to support accounts, deposits, cards, and lending on a single ledger and account model.</li>
<li>Help drive the build-vs-buy decision. Evaluate core banking platforms and processors, run vendor diligence, model cost and time-to-market, and help leadership decide whether we extend what we have or integrate a third party.</li>
<li>Shape the account and ledger model. Work with Engineering and Finance on account hierarchies, sub-ledgers, chart-of-accounts mapping, posting rules, holds, interest and fee accrual, and general ledger integration.</li>
<li>Specify money movement. Own product requirements for transfers, ACH, card issuing and network settlement, real-time rails, and returns and reversals — including exception handling, cutoff windows, and settlement reconciliation.</li>
<li>Make the platform auditable. Ensure the system produces the reporting, traceability, and controls that Finance, audit, and regulators need — reconciliation breaks, balance attestation, and complete transaction history.</li>
<li>Partner on regulatory readiness. Work with Compliance and Legal to turn their requirements into platform capabilities: screening hooks, onboarding data, error resolution, disclosures and statements, and reporting. You don’t need to arrive fluent in US banking regulation — you do need to be someone who learns it properly.</li>
<li>Plan migration and cutover. If a migration is in scope, own data mapping, parallel-run strategy, validation criteria, rollback plans, and phased cutover.</li>
<li>Write the technical requirements. Own detailed specs, API contracts, event schemas, data models, user stories, and release plans end-to-end.</li>
<li>Use data to prove it works. Write your own SQL. Define platform KPIs — posting latency, reconciliation break rate, settlement accuracy, failure rates — and monitor them relentlessly.</li>
<li>Manage risk early. Anticipate technical risks, edge cases, race conditions, and dependencies before they become incidents. Money movement defects are the expensive kind.</li>
<li>Operate with urgency. Deliver against an evolving regulatory and business timeline with incomplete information.</li>
</ul>
What We Look For:
<ul>
<li>Bachelor’s or advanced degree in Engineering, Computer Science, or other technical discipline (required).</li>
<li>5–10 years of product experience, with meaningful time spent on financial infrastructure rather than only customer-facing surfaces.</li>
<li>Real ownership in at least one of the following. You do not need all of them, and we care much more about depth in one than exposure to several:</li>
</ul>
<ol>
<li>Ledgers, general ledger, or balance and transaction systems</li>
<li>Payments processing, orchestration, or money movement — ACH, card networks, transfers, settlement, or the LATAM equivalents (PIX, SPEI, PSE, CCE)</li>
<li>Card issuing or card program management</li>
<li>Deposit, wallet, or account platforms</li>
<li>Lending origination or loan servicing platforms</li>
<li>Product work at a processor, BaaS provider, or core banking vendor</li>
</ol>
<ul>
<li>Comfort with double-entry accounting concepts as they show up in software — debits and credits, sub-ledgers, accruals, reconciliation — or a genuine appetite to get comfortable with them quickly.</li>
<li>Deep technical understanding of APIs, event-driven architecture, idempotency, distributed system failure modes, batch vs. real-time processing, and data flows.</li>
<li>Strong SQL skills and comfort querying and interpreting data independently.</li>
<li>Experience working directly with Compliance, Legal, Finance, or Treasury as stakeholders — not only Engineering and Design.</li>
<li>Comfortable working in ambiguity and making sound, documented decisions with incomplete information.</li>
<li>Strong written and verbal communication — can hold your own in an engineering standup, a Finance review, and an executive discussion.</li>
<li>Hands-on familiarity with AI tools, data models, or generative AI applications—personally, professionally, or better yet, both!</li>
</ul>
Preferred Qualifications:
<ul>
<li>Direct experience with a core banking platform, in-house or vendor (Thought Machine, Mambu, 10x, Finxact, Temenos, Technisys, Galileo, Pismo, or similar).</li>
<li>Experience with a core migration, conversion, or major ledger replacement.</li>
<li>Experience at a chartered or licensed financial institution, or supporting a charter, banking licence, or deposit insurance application.</li>
<li>Familiarity with consumer finance regulation — US (Reg E, Reg DD, Reg CC, Reg Z, TILA, FCRA, BSA/AML) or equivalent local regimes.</li>
<li>Background in consumer credit or BNPL, card products, or bank-fintech sponsorship programs.</li>
<li>Experience with third-party risk management and vendor oversight in a regulated environment.</li>
</ul>
About You:
<ul>
<li>You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.</li>
<li>You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things</li>
<li>You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.</li>
<li>You earn trust - you listen attentively, speak candidly, and treat others respectfully.</li>
<li>You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly.</li>
<li>You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle.</li>
</ul>
What Makes Working at Sezzle Awesome: At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators. We believe in surrounding ourselves with only the best and the brightest individuals. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.
#Li-remote #Full-time

Senior Technical Product Manager, Banking Platform

The salary range for this role is negotiable, the range being $6,000-$11,000 per month (Gross in USD), based on location and experience level.&nbsp;&nbsp;
About Sezzle:
With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!
Compensation:
For this principal development role, with 12+ years of experience, the compensation range is $6000 - $11000 per month, negotiable based on the skills and experience being brought to the table. This range acknowledges the extensive expertise, leadership capabilities, and significant contributions expected at this level.
This is a fully remote role. We believe the best engineers can do world-class work from anywhere, and we hire accordingly. You get principal-level scope and ownership at a growing fintech, competitive compensation, and no relocation or commute attached to it. Work from where you do your best work.
About the Role:&nbsp;
We are seeking a talented and motivated best-in-class Principal Software Engineer to own and lead the evolution of authentication and authorization at Sezzle. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement.
Sezzle is investing in the next generation of its authentication and authorization platform, centered on a purpose-built API auth gateway and a clean set of identity and access management services. As the Principal Software Engineer leading this effort, you will own the technical vision, architecture, and migration strategy for this transformation.
In this backend focused role, you will work closely with stakeholders from Product, Security, Support and the business. You’ll also partner with engineering teams across the organization to deliver auth capabilities that are safe, incremental to adopt, and invisible to customers. Your day-to-day responsibilities will include designing, developing, and delivering gateway and identity services, as well as unblocking and mentoring your teammates. Your work will generally focus on foundational platform capabilities, security-critical paths, and performance at the edge.
At Sezzle, AI-assisted development is a standard part of how we build, paired with the rigorous review and security discipline the auth-critical path demands. As a principal engineer, you will help set the pattern for how AI tooling is used well on security-sensitive systems.
Key Responsibilities
<ul>
<li>Own the technical vision and roadmap for Sezzle’s authentication and authorization platform, including a dedicated API auth gateway and supporting identity services.</li>
<li>Architect, design, and build scalable, highly-available auth services and gateway components primarily in Golang, leveraging AWS, RDS (MySQL/Postgres), and modern distributed patterns.</li>
<li>Design and lead phased, zero-downtime migrations of auth traffic and functionality, with clear rollback and safety mechanisms at every step.</li>
<li>Establish and evolve authentication and authorization standards across the platform: OAuth2/OIDC flows, token strategy (JWT, opaque, refresh), service-to-service auth (mTLS, workload identity), and fine-grained authorization models (RBAC/ABAC/policy engines).</li>
<li>Drive consistency and scalability across a distributed microservices architecture while maintaining the performance, reliability, and latency budgets expected of an edge gateway.</li>
<li>Partner with Security and Compliance to ensure the new platform meets fintech-grade security and regulatory requirements, and champion secure-by-default patterns across engineering.</li>
<li>Establish and evolve engineering best practices for observability, security, and CI/CD across teams, with particular rigor on the auth-critical path.</li>
<li>Participate in the on-call rotation for the services you own, and help lead incident response and postmortems on the auth-critical path.</li>
<li>Mentor engineers and champion a culture of learning, innovation, and operational excellence.</li>
<li>Collaborate cross-functionally to translate business goals into technical roadmaps and deliver results that matter.</li>
</ul>
Minimum Requirements:
<ul>
<li>12+ years of professional software engineering experience, including significant backend experience.</li>
<li>Deployed significant changes to a production application in the past 30 days.</li>
<li>Deep, hands-on expertise in authentication and authorization systems: OAuth2, OpenID Connect, SAML, JWT and session-based auth, token lifecycle management, and modern authorization patterns (RBAC, ABAC, policy-as-code).</li>
<li>Experience designing, building, or operating an API gateway or auth proxy at scale: whether a commercial/open-source gateway (e.g., Kong, Envoy, AWS API Gateway, Traefik) or an in-house edge service.</li>
<li>Proven track record leading a large-scale service extraction or migration: decomposing a monolith or large legacy service into well-bounded services with zero or minimal customer impact.</li>
<li>Strong proficiency in Golang, with experience building and maintaining RESTful APIs.</li>
<li>Expertise with SQL-based RDBMS (MySQL, PostgreSQL) and experience optimizing schema and queries for performance at scale.</li>
<li>Solid understanding of distributed systems design patterns (e.g., transactional outbox, event-driven architecture, queues) and the specific challenges of high-throughput, low-latency edge services.</li>
<li>Demonstrated ability to bring new ideas forward, influence decisions, and lead complex technical initiatives across many teams.</li>
<li>Demonstrated AI-forward engineering: you actively use AI tooling (e.g., Claude Code, Codex, Cursor, or custom LLM integrations) in your development work today, have opinions grounded in practice about where it helps and where it doesn't, and help teammates adopt AI-assisted workflows.</li>
<li>Bachelor’s degree in Computer Science or a similar technical field (required).</li>
</ul>
Preferred Knowledge and Skills:
<ul>
<li>Experience with identity platforms and standards implementations (e.g., Keycloak, Auth0, Okta, Ory, or in-house IdPs), and familiarity with fine-grained authorization approaches (policy-as-code, relationship-based access control) as we centralize authorization over time.</li>
<li>Experience with service mesh and edge technologies (Envoy, Istio, mTLS, rate limiting, WAF integration).</li>
<li>Familiarity with threat modeling, secure design review, and common auth attack vectors (token theft, replay, CSRF, session fixation, privilege escalation).</li>
<li>Proficiency in observability tools (Prometheus, Grafana, Datadog, New Relic), especially for latency-sensitive edge services.</li>
<li>Experience with AWS cloud infrastructure, mainly AWS Aurora RDS, both MySQL and Postgres.</li>
<li>Experience in fintech, payments, BNPL, or consumer lending - familiarity with financial compliance (PCI-DSS, SOC 2), credit decisioning, or transaction processing systems.</li>
<li>Experience with CI/CD pipelines and containerized microservices (Docker, Kubernetes).</li>
<li>Track record of shipping commercial APIs and platform infrastructure in high-growth environments.</li>
<li>Proven leadership in guiding technical direction, improving system reliability, and scaling engineering organizations.</li>
</ul>
About You:
<ul>
<li>You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.</li>
<li>You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things.</li>
<li>You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.</li>
<li>You earn trust - you listen attentively, speak candidly, and treat others respectfully.</li>
<li>You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly.</li>
<li>You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle.</li>
</ul>
Sezzle’s Technology Stack:
<ul>
<li>Languages: Golang, Typescript, Python</li>
<li>Frontend: Typescript - React and React Native</li>
<li>Backend: Golang</li>
<li>Database: MySQL, Postgres, Elasticsearch</li>
<li>DevOps &amp; Cloud: AWS, Kubernetes</li>
<li>Version Control: Git</li>
<li>CI/CD: Gitlab</li>
<li>Testing: Developer and AI-driven, focus on automated end-to-end, integration, and unit tests</li>
<li>Open Source: Sezzle is focused on using open source, and we build what we can before buying!</li>
</ul>
What Makes Working at Sezzle Awesome?&nbsp;
At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators; we are skilled musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers. We believe in surrounding ourselves with not only the best and the brightest individuals, but those that are unique and purpose-driven in all that they do. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.
#Li-remote #full-time

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