Five9, Inc., together with its subsidiaries, provides cloud software for contact centers in the United States and internationally. The company offers virtual contact center cloud platform that delivers a suite of applications, which enables the breadth of contact center-related customer service, sales, and marketing functions. Its solution enables its clients to manage these customer interactions across various channels, including voice, video, chat, email, website, social media, click-to-call, callback, and mobile channels, as well as through APIs; and provides natural language processing and automatic speech recognition solutions. The company serves customers in various industries comprising banking and financial services, business process outsourcers, consumer, healthcare, technology, and education. Five9, Inc. was incorporated in 2001 and is headquartered in San Ramon, California.

five9

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp;&nbsp; About the Role We are actively looking for a Senior Software Engineer with experience working with Auth Systems, Security &amp; Google Cloud Platform, to join our team. Five9 delivers market-leading up-time for its Contact Center application while constantly delivering new features and capabilities to highly demanding enterprise customers. This requires that Five9 continually enhances, updates and modernizes the Platform Services that the Contact Center Application runs on. This position requires excellent understanding of cloud software: how it's built, deployed, tested and managed. Key Responsibilities Contribute to the next generation of Five9’s modern SaaS platform enabling AI-driven customer engagement. Design and develop highly available, scalable, and reliable microservices infrastructure. Build and enhance Identity &amp; Access Management (IAM) systems supporting OAuth, security tokens, SSO, federation, and customer/partner identities. Apply cloud and open-source technologies to solve complex platform challenges. Gain deep understanding of existing systems and contribute to architectural improvements. Troubleshoot production issues and provide operational support across the software stack. Collaborate with cross-functional engineering teams and drive technical excellence. Required Skills &amp; Experience Strong expertise in Java, APIs, Spring Security, and Web Authentication. Hands-on experience with SSO, SAML, OAuth, Federation, IDP, and CI/CD for identity platforms. Experience managing Ping Identity (architecture, configuration, and operations). Ownership of production uptime, reliability, SLAs/SLOs, and incident response. Participation in 24/7 on-call rotation for identity-related systems. Experience in performance tuning microservices and database queries. Familiarity with distributed databases such as CockroachDB or Cassandra. Experience with cloud platforms (GCP preferred). Good to Have Experience with Okta IAM. Exposure to large-scale SaaS environments and platform modernization initiatives. &nbsp;Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Sr Software Engineer - IDP | India

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp;Role Overview Design, build, and operate the server-side systems that power our screen recording platform. This role focuses on developing scalable, reliable backend services and APIs that support recording session orchestration, large file ingestion, and secure data handling. You will be a core contributor to a Java-based, cloud-native microservices architecture that supports real-time and asynchronous workloads at scale. Key Responsibilities Service &amp; API Development Design, develop, and maintain performant backend services using Java and Spring Boot. Build and evolve RESTful APIs for core platform capabilities, including recording session lifecycle, file and chunk uploads, and user/account management. Implement reliable ingestion pipelines for large video chunks with retries, idempotency, and failure handling. Ensure secure, efficient data storage and retrieval using cloud-managed databases. Implement robust authentication and authorization mechanisms to protect platform resources and APIs. Architecture, Quality &amp; Reliability Contribute to the design and evolution of a microservices-based architecture, balancing scalability, maintainability, and operational simplicity. Write clean, well-structured, and thoroughly tested code, including unit, integration, and API-level tests. Participate actively in code and design reviews, maintaining a high engineering bar. Implement structured logging, metrics, monitoring, and alerting to support production observability. Continuously optimize performance and scalability to handle increasing traffic and data volume. Collaboration &amp; Operations Work closely with desktop, frontend, and data engineering teams to deliver end-to-end features. Participate in the full software development lifecycle, from design and implementation to deployment and ongoing maintenance. Contribute to a strong DevOps culture, including CI/CD pipelines and automated deployments. Assist in debugging, incident response, and root-cause analysis for production issues. Technical Stack Language Java Frameworks Spring Boot Spring Security Spring Data Cloud Google Cloud Platform (GCP) or Amazon Web Services (AWS) Databases NoSQL (e.g., Google Cloud Datastore, DynamoDB) Relational (e.g., PostgreSQL, MySQL) Messaging &amp; Async Processing Pub/Sub, Kafka, or similar distributed messaging systems Testing JUnit Mockito Spring Test Containerization &amp; Orchestration Docker Kubernetes Required Qualifications 3+ years of experience in backend software development. Strong proficiency in Java and the Spring Boot ecosystem. Hands-on experience designing and implementing RESTful APIs. Experience working with cloud platforms (GCP or AWS). Familiarity with both SQL and NoSQL databases. Solid understanding of testing, debugging, and production readiness. Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Staff Software Engineer_AQM Media

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp;Our team is looking for an energetic Java Software Engineer who is passionate about creating high-performing, scalable, and resilient mission critical back-end services that are the foundation of Five9’s contact center platform. As a member of the team you will take end-to-end ownership of a solution to deliver services enriching our Contact Center platform and applications. In this highly visible and influential role your work will build the foundation to support the efforts of multiple teams. Your work in building APIs will set the standard across the organization by eliminating inconsistencies and streamlining the efficiency of our core services. &nbsp; Key Responsibilities: Be part of an agile team to develop scalable, highly available core platform services. Participate and contribute to requirements analysis. Collaborate with product managers, architects, engineering leaders and test engineers. Understand performance and scalability principles and apply when developing software. Troubleshoot and support current platform in production. This position requires the ability to be part of on-call rotation, troubleshooting issues. &nbsp; Requirements 3+ years of industry experience in server-side development and integrations. 3+ years of experience in Java. Strong Computer Science fundamentals in design, data structures, problem solving. Experience with any public cloud platform and microservices is a plus. Deep knowledge and experience in building Spring Framework applications. Experience in&nbsp;implementing RESTful and RPC interfaces. Experience in applying design patterns and separating concerns in a distributed system. Experience developing and deploying internet scale, distributed services. Experience working with SQL and NoSQL databases and caches. Experience working within an Agile/Scrum team. Positive, self-motivated and enthusiastic attitude with a strong-sense of ownership. Strong communication skills, both verbal and written. &nbsp; Benefits: Five9 Shares Bonus Scheme 10% Flexi Benefit Meal Allowance Medical Insurance Life Insurance&nbsp; 25 day Annual Leave + Public Holidays &nbsp;Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Software Engineer II - Backend

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp; About the Role Five9 is seeking a Senior Software Engineer with deep expertise in API Gateways, API security, cloud-native systems, and Google Cloud Platform (GCP). In this role, you will help shape the next generation of Five9’s modern SaaS platform that powers our industry‑leading Contact Center solutions. You’ll be instrumental in building highly available microservices with a strong focus on API Gateway architecture, API Developer Portal development, platform reliability, and secure service communication. Key Responsibilities Contribute to the evolution of Five9’s modern SaaS platform that enables enterprises to deliver exceptional customer service powered by AI. Design, develop, and maintain highly available, scalable microservices, with a core focus on: API Gateway architecture (APIGEE) API Developer Portal design and enhancements Implement and manage API Gateway policies, authentication flows, routing, throttling, and access controls. Ensure APIs are secure, well‑documented, and easily consumable by internal and external developers. Monitor API performance, analyze traffic patterns, and identify bottlenecks to optimize system efficiency. Drive improvements by staying current with industry best practices in API management, security models, and cloud platform modernization. Develop deep understanding of existing systems and contribute meaningfully to architectural decisions. Troubleshoot critical issues across the software stack and provide production support as part of the 24/7 on‑call rotation. Collaborate cross-functionally with platform engineering, product teams, and architects to deliver robust cloud capabilities. Apply strong problem‑solving abilities and broad technology expertise to resolve complex platform challenges. Required Skills &amp; Experience 7+ years of hands-on software development experience. Strong expertise in: API Gateway technologies (APIGEE required) API development using Java, Spring / Spring Boot Microservices architecture Proven experience building and maintaining API Developer Portals. Strong understanding of API security frameworks, policies, and standards. Experience with OAuth2, authentication/authorization standards, and identity systems. Practical knowledge of GCP or another major cloud provider (GCP strongly preferred). Strong debugging skills with ability to dive deep into complex system interactions. Experience supporting production systems, monitoring, and participating in on‑call rotations. Excellent communication skills and ability to work effectively in a collaborative, high‑performance engineering culture. Nice to Have Hands‑on experience with: Service mesh Kubernetes CI/CD pipeline orchestration API analytics &amp; observability tools Contribution to open-source tools or cloud-native platform components. Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Sr. Software Engineer - API Gateway | India

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp; The Team The Product Engineering team drives the development and realization of practical AI solutions for the contact‑centre environment. Our existing Studio product stack is built on PHP/Laravel, Python, and Vue.js, deployed across both private and public clouds. We leverage leading cloud AI services, including Azure OpenAI, Google AI APIs, IBM Watson, and Amazon Lex. Our vision is to reimagine the connection experience between end users and the brands that serve them. Our AI agents will deliver delightful, efficient self‑service at super‑human speeds, while seamlessly integrating live human agents whenever a human touch is required. These AI agents will also assist live agents and help supervisors and managers optimize the blend of human and AI workforce. The Staff Software Engineer role is part of the Studio Innovations team, which focuses on modernizing the existing Studio product. This team ensures our production systems remain stable, secure, and high‑performing, and is responsible for enhancements that transition the Studio platform into Java microservices on GCP. This position is based out of an affiliate office of Acqueon Technologies in India, following the hybrid work model of that location. Role Purpose The Staff Software Engineer in the R&amp;D AI Automation Team is responsible for designing, developing, and maintaining the Studio product — a drag‑and‑drop flow builder and execution engine that integrates multiple channels such as voice, SMS, and chatbots with the Five9 contact‑centre voice platform. This role plays a key part in modernizing and re‑architecting the Studio product into Java-based microservices on GCP. Responsibilities include: Software design, development, testing, and documentation across backend, frontend, and interaction management platforms. Collaborating with product owners and designers to expand the feature set and deliver high‑quality user experiences. Taking operational ownership of service performance and quality, including possible participation in an on‑call rotation. Exploring cutting-edge technologies and partnering with product teams to convert ideas into production‑ready solutions. How You Contribute Lead the design, development, and implementation of new features and change requests. Write high-quality, efficient, and maintainable code with a focus on scalability and multi‑tenancy, while adhering to coding best practices. Serve as the go‑to expert for ambiguous or time‑sensitive challenges. Contribute to production incident management and debugging of complex issues using monitoring, logging, and APM tools such as New Relic, Grafana, and Prometheus. Conduct thorough code reviews and maintain high coding standards. Identify technical debt and propose actionable improvements. Apply strong understanding of multiple programming languages, frameworks, and development methodologies to solve complex technical problems. Act as a natural coach and mentor, providing technical guidance and support to peers. Fill functional gaps across engineering and cross‑functional teams to maintain continuity and efficiency. Ensure project milestones are met and development aligns with business objectives. Contribute to documentation, specifications, processes, and APIs. Skills, Competencies, and Qualifications Required 8+ years of experience designing and developing high‑traffic, distributed, and scalable systems on cloud platforms such as GCP, AWS, or Azure within a SaaS environment. Hands-on expertise in cloud‑native backend microservices development using Java and frameworks like Spring Boot. High proficiency in multiple programming languages, including but not limited to Java, PHP, JavaScript, and Python. Experience with web technologies such as HTML, CSS, JavaScript, and modern front-end frameworks like Vue.js or React. Strong experience with observability and monitoring tools: New Relic, Grafana, Prometheus, and similar systems. Expertise in SQL and NoSQL databases, along with optimization techniques. Expertise in CI/CD, containerization, and Kubernetes. Solid understanding of web security best practices and the ability to implement application and data protection measures. Ability to deploy, monitor, and troubleshoot applications in production. A portfolio demonstrating experience in architecture, design, and full-stack development. Ability to work both independently and collaboratively. Strong commitment to on-time delivery of high-quality code and solutions. Educational Qualifications Bachelor’s degree in Computer Science, Engineering, or a related field (Master’s preferred). Desirable Experience with PHP. Experience working on multi-tenant systems. Expertise with sharding using MySQL, Redis, or MongoDB. Experience in Contact Centre, IVR, Virtual Agents, VoIP, or telecom service provider environments. Other Requirements This role requires participation in an on‑call rotation. Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Staff Software Engineer | R&D AI Automation

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp;Our global voice team is looking for a committed, experienced Senior Software Engineer who is passionate about creating high performing, scalable, and resilient mission critical services that are the foundation of Five9’s next generation contact center platform. You will have the opportunity to combine what you already know with new learnings, crafting a bespoke solution that serves our customers and partners. &nbsp; Responsibilities: Participate in an Agile scrum team which practices DevOps. Write clean and well-documented code and tests. Deliver your code as part of an overall solution running in the public cloud. &nbsp; Required Skills: 5+ years professional experience in software development, with some being written in C and/or C++. Hands-on experience writing software for real-time communications signaling and media protocols (SIP, RTP, etc.). Ability to methodically troubleshoot complex systems. Excellent communication and organization skills, and a sense of ownership. &nbsp; &nbsp;Technical Skills: Modern C++ (C++17+), RTP/SIP, audio codecs, SIP/SDP, ASR/TTS integration, AI APIs, cloud platforms (AWS/Azure/GCP), CI/CD, containers, SRE principlesb &nbsp; Benefits: Five9 Shares Bonus Scheme 10% Flexi Benefit Meal Allowance Medical Insurance Life Insurance&nbsp; 25 day Annual Leave + Public Holidays &nbsp;Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Senior C++ Software Engineer - Global Voice

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp;Senior Software Engineer (Bengaluru) Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic self.&nbsp; &nbsp; The team&nbsp; &nbsp; The product engineering team drives the realization of practical AI solutions for the contact centre environment. Our existing Studio product stack is built on PHP/Laravel, Python and Vue.js technology deployed in private and public clouds. We leverage the latest cloud AI services such as Azure OpenAI, Google AI APIs, IBM Watson and Amazon Lex.&nbsp; Our vision is nothing less than to reimagine the experience of connection between end users and the brands which serve them. Our AI agents will offer self-service which delights and accomplishes tasks at super-human speeds, while also blending in live human agents for the many cases when a human touch is needed. Our AI agents will assist the live agents too and help supervisors and managers get the most out of their mix of human and AI labor. The role of Senior Software Engineer is for the Studio Innovations team, which modernizes existing Studio product. This team keeps our production systems stable, secure, and performing at their best, handling everything from enhancement of the existing studio product to modernize it into Java microservices on the GCP cloud. &nbsp; This position is based out of one of the offices of our affiliate Acqueon Technologies in India and will adopt the hybrid work arrangements of that location. Role purpose&nbsp; The role of a Senior Software Engineer in the R&amp;D AI Automation Team is to design, develop, and maintain the software solution (Studio) with drag-drop flow builder and execution engine that integrates multiple channels like voice, SMS, and chatbot with the Five9 contact centre voice solution. This role would be a key developer role to modernize and re-architect the existing Studio product to use Java microservices on GCP. The Senior engineer's responsibilities include software design and development, testing and documentation across our backend, front-end and interaction management platforms to deliver end-to-end features, work with product owners and designers to expand the feature set and create high-quality user interfaces, take operational responsibility for the performance and quality of services owned by your team, potentially including taking part in an on-call rotation, deep dive into cutting edge technologies and work with the products team to transfer ideas into products. &nbsp; How you contribute&nbsp; Understands various programming languages, frameworks, and development methodologies, which allow you to make informed decisions and solve complex technical challenges. Help create blueprints that outline how different components of the system will interact, ensuring scalability, maintainability, and performance Writing high-quality, efficient, and maintainable code that serves the purpose of scaling and tenancy management. Should follow coding best practices and contribute to developing software modules, features, and functionalities. Contribute to production incident management and debugging complex issues using knowledge of monitoring tools, logging systems, and application performance management like New Relic, Grafana, Prometheus etc. Mentor junior engineers, helping them develop their skills and grow as professionals. This fosters a culture of continuous learning and collaboration within the team. Ensure that the development stays on track, milestones are met, and the project aligns with business objectives.&nbsp; Collaborate with cross-functional teams, including product managers, designers, and quality assurance professionals, to ensure that everyone is aligned on project goals and progress. Skills, competencies and qualifications&nbsp; &nbsp; Required:&nbsp; 5+ years of designing and developing high traffic distributed and scalable systems on a cloud-based platform (GCP. AWS or Azure) in a SaaS company. Hands-on expertise in cloud-native backend microservices with Java &amp; backend frameworks like Spring Boot. Highly proficient in a variety of programming languages, including but not limited to Java, PHP, Javascript, Python or others as required.&nbsp;&nbsp; Experience with web development technologies such as HTML, CSS, JavaScript, and modern front-end frameworks like Vue.js or React.&nbsp; Strong observability and monitoring exposure by monitoring tools, logging systems, and application performance management like New Relic, Grafana, Prometheus etc. Expertise in databases (SQL and NoSQL), and their optimization techniques. Expertise in CI/CD, Containerization and Kubernetes. Awareness of web security best practices and the ability to implement security measures to protect applications and data.&nbsp; Ability to deploy and monitor applications in production along with diagnosing any technical issues.&nbsp; A portfolio of past projects showcasing full-stack development skills.&nbsp; Ability to work independently and as part of a collaborative team.&nbsp; Strong commitment to delivering high-quality code and solutions on time and within scope.&nbsp; &nbsp; Educational qualifications Bachelor's degree in computer science, engineering, or related field &nbsp; &nbsp; &nbsp; Desirable:&nbsp; Experience with PHP.&nbsp; Experience with Contact Centre, IVR, Virtual Agents, VoIP and telecommunications service providers is advantageous.&nbsp; Other requirements&nbsp; This position requires the ability to be On Call.&nbsp; &nbsp; Key relationships&nbsp; There are no direct reports to this role.&nbsp; Key stakeholders include:&nbsp; Service owners and their teams.&nbsp; Technical leadership and senior management, including VPs.&nbsp; Engineering teams.&nbsp; Network and Telecom teams.&nbsp; Customer service teams.&nbsp; Compliance and infosec teams.&nbsp; Reporting Structure This position reports to the Senior Engineering Manager Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Sr Software Engineer

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp;populate JD &nbsp;Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp; Role Purpose As a Senior Software Engineer on the Cortex Management Team at Five9, you will design, develop, and maintain backend software solutions supporting the company’s AI initiatives. This role focuses on building scalable, reliable, and high-performance backend systems that power end-to-end platform capabilities. You will be responsible for backend architecture, service design, implementation, testing, and documentation. Working closely with product owners and key stakeholders, you will translate requirements into robust backend services and APIs. The role also involves deep technical exploration of emerging technologies and partnering with product teams to bring innovative ideas into production. In addition, this position plays a key role in mentoring other engineers and driving backend engineering best practices across Five9. How You Contribute Leverage strong expertise in programming languages, frameworks, and development methodologies to solve complex backend and distributed-systems challenges. Write high-quality, efficient, and maintainable backend code by following best practices and contributing to core services, APIs, and platform capabilities. Troubleshoot and resolve complex production and architectural issues by identifying root causes and implementing scalable solutions. Ensure development stays on track, deliverables meet milestones, and solutions align with business and platform objectives. Collaborate closely with cross-functional teams including product managers, backend development teams, frontend engineers, and quality assurance to ensure alignment on requirements, functionality, and delivery. Follow and contribute to engineering processes, service documentation, technical specifications, and API contracts. Ensure development stays on track, milestones are met, and the project aligns with business objectives. Required Skills and Qualifications 5+ years of industry experience in Java backend development. Strong proficiency with server-side technologies, including: REST API design and implementation Microservice architectures Backend frameworks such as Spring Boot Databases (SQL, NoSQL, Redis) Hands-on experience designing and implementing scalable, high-performance microservices that expose REST APIs. Experience solving complex problems that span multiple services, products, or distributed systems. Solid understanding of security best practices and the ability to implement measures to protect applications and data. Ability to work both independently and as part of a collaborative engineering team. Strong commitment to delivering high-quality, performant, and scalable backend solutions on time and within scope. Proven ability to mentor other developers through direct guidance and code reviews. Bachelor’s degree (or equivalent) in a relevant discipline. Desirable Qualifications Experience with Google Cloud Platform (GCP), Kubernetes, build tools (Gradle preferred), and CI/CD pipelines (GitLab preferred). Experience with event-driven messaging systems. Experience with contact center technologies, including IVR, virtual agents, VoIP, and telecommunications service providers. Experience with AI development tools. Key Stakeholders Service owners and their teams Technical leadership and senior management Engineering teams Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Sr Software Engineer - AI Cortex team | India

Join us in bringing joy to customer experience. &nbsp;Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. &nbsp;&nbsp; Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.&nbsp; About the Role Five9 is seeking a Staff Software Engineer – Call Control to lead the architecture, design, and development of our real‑time Call Control platform. This platform powers mission‑critical voice capabilities, including low‑latency call control, high‑quality voice streaming, integration with AMD (Answer Machine Detection) vendors, and global voice expansion using Kafka and Kafka Connect for a scalable, distributed architecture. This core platform is essential to ensuring accuracy, scalability, reliability, and 99.999% availability, enabling efficient use of contact center resources and delivering an outstanding customer experience. As a senior individual contributor, you will be one of the most experienced engineers on the team. You will mentor engineers, guide architectural direction, collaborate with cross‑functional teams, and drive platform evolution. This role is hands‑on, involving system design, development, debugging, and production operations following DevOps practices. You will ensure the platform remains low‑latency, observable, scalable, reliable, and easy to maintain. What You’ll Do Lead architecture and end‑to‑end development of real‑time voice systems. Design and optimize low‑latency, high‑performance microservices using Java/Spring Boot and Java/Kotlin. Apply strong object‑oriented design, design patterns, clean code practices, refactoring, and code-quality standards. Build distributed, event‑driven systems with high scalability, reliability, and low latency. Design and evolve REST APIs, ensuring backward compatibility and strong service contracts. Use Redis for caching, distributed locking, application state management, and fast data access. Build observability into systems—tracing, structured logging, metrics, and profiling. Work with public cloud platforms (AWS and GCP; GCP preferred). Mentor engineers, drive technical best practices, and elevate code and design quality. Collaborate closely with Product, AI, Infrastructure, and SRE teams to deliver complete solutions. Own the full software lifecycle: design, implementation, deployment, and production operations. Ensure the platform meets Five9’s standards for scalability, reliability, performance, and observability. Required Qualifications 10+ years of professional software development experience. 5+ years building real‑time voice systems using Java/Kotlin and C++. 1+ year hands‑on experience with real‑time GenAI voice platforms. Bachelor’s degree or higher in Computer Science or a related field. Required Technical Skills Languages/Frameworks: Java, JS, Kotlin Voice &amp; Real-Time Comms: SIP, RTP, RTCP Cloud Platforms: GCP / AWS Databases: MySQL, PostgreSQL DevOps: CI/CD, Containers, SRE principles AI Integrations: AI APIs Good to Have Node.js, TypeScript, WebRTC experience Leadership &amp; Impact Lead architecture for mission‑critical, high‑availability systems Mentor and guide engineering teams Drive platform-wide technical decisions Balance trade‑offs across latency, quality, cost, and reliability &nbsp;Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.&nbsp; View our privacy policy, including our privacy notice to California residents here:&nbsp;https://www.five9.com/pt-pt/legal.&nbsp;&nbsp; Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

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