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; The Team The Core Applications team takes pride in providing exceptional support and innovative solutions for a diverse range of essential applications and tools, including Agent Desktop Plus, Supervisor Plus, Admin Console, Freedom Application Platform, Internal Admin (Shell), Agent Assist UI, Nimbus, and Unified Portal / Login. We have a passion for excellence. Our dedicated team is committed to optimizing user experiences, streamlining workflows, and enhancing productivity across the board. Whether empowering agents with intuitive interfaces, empowering supervisors with powerful management tools, or enabling seamless access to critical applications via multiple platforms, we strive to deliver with utmost efficiency and customer satisfaction. Our mission is to shape the future of Five9, where innovation and collaboration go hand in hand as we strive to build a world-class ecosystem of integrated solutions that cater to the ever-evolving needs of our valued users. Role Purpose The role of a Senior Software Engineer in the Core Applications team is to design, develop, and maintain software solutions across the Core Applications software suite. Responsibilities include software architecture, design and development, testing and documentation across our backend and front-end platforms to deliver end-to-end features, working with product owners and designers to design and deliver new features and create high-quality user interfaces, taking operational responsibility for the performance and quality of services owned by the team, including taking part in an on-call rotation, deep diving into cutting edge technologies and working with the products team to transfer ideas into products. The role is also responsible for mentoring other developers at Five9. How You Contribute Understands various programming languages, frameworks, and development methodologies, which allow you to make informed decisions and solve complex technical challenges. Writing high-quality, efficient, and maintainable code. Should follow coding best practices and contribute to the development of software modules, features, and functionalities. Troubleshoot and resolve complex technical issues. When problems arise, you use your experience and problem-solving skills to identify the root causes and implement effective solutions. Ensure that the development stays on track, milestones are met, and the project aligns with business objectives. Collaborate with cross-functional teams, including product managers, designers, and quality assurance professionals, to ensure that everyone is aligned on project goals and progress. Follows and contributes to processes, documentation, specifications, and APIs. Skills, Competencies and Qualifications Required Highly proficient in a variety of programming languages, including but not limited to TypeScript/JavaScript, Java, PHP, or others as required. Strong experience with web development technologies such as HTML, CSS, TypeScript/JavaScript, and modern front-end frameworks like React. Strong experience with server-side technologies, REST API design and implementation, microservice architecture, databases (SQL, NoSQL, and Redis), and back-end frameworks like Java Spring Boot. Awareness of web security best practices and the ability to implement security measures to protect applications and data. A portfolio of past projects showcasing full-stack design and development skills. Ability to work independently and as part of a collaborative team. Strong commitment to delivering high-quality, performant, and scalable code and solutions on time and within scope. Ability to mentor other developers directly and via code reviews. Bachelor’s degree (or equivalent) in relevant discipline. Desirable Experience with Contact Centre, IVR, Virtual Agents, VoIP and telecommunications service providers is advantageous. Experience with Google Cloud Platform, Kubernetes, and CI/CD. Other Requirements This position requires the ability to be On Call. Key Relationships There are no direct reports to this role.&nbsp;Key stakeholders include: Service owners and their teams Technical leadership and senior management, including VPs Engineering teams Network and Telecom teams Customer service teams Compliance and infosec teams This is not a customer-facing role. &nbsp; &nbsp; &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 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;&nbsp; The Team&nbsp;&nbsp;&nbsp; CRM &amp; SDK team is focusing on integrating Five9 dialer into&nbsp;multiple&nbsp;CRM systems&nbsp;and works&nbsp;with variety of&nbsp;backend and&nbsp;frontend&nbsp;technologies&nbsp;&nbsp;&nbsp;&nbsp;The&nbsp;Role Purpose&nbsp; Be part of an agile team to develop a scalable,&nbsp;highly available&nbsp;global voice platform&nbsp; Collaborate with Product Managers, Architects, Engineering&nbsp;leaders&nbsp;and Test Engineers Understand performance and scalability principles and apply them when developing software&nbsp; Troubleshoot and support current platform in production (we embrace DevOps) Designs, develops, troubleshoots, debugs, and implements software code using JavaScript, Java, Spring, and related technologies&nbsp; Write unit and functional tests, be able to document and communicate clearly&nbsp;&nbsp; Skills, Competencies and Qualifications Required&nbsp; 5+ years of industry experience in backend development (Java)&nbsp; 5+ years of industry experience in frontend development (JavaScript, TypeScript, React)&nbsp; Deep knowledge and experience with frameworks such as Spring&nbsp; Hands on Experience in designing and implementing scalable, high performing Microservices providing REST APIs&nbsp; Strong&nbsp;expertise&nbsp;in web development technologies, including HTML, CSS, and modern front-end frameworks.&nbsp; Experience working with cloud platforms such as GCP or AWS.&nbsp; Expertise&nbsp;server-side technologies and databases (SQL or NoSQL).&nbsp; Experience working on complex problems spanning multiple products and systems&nbsp; Experience working within an Agile/Scrum team Positive,&nbsp;self-motivated&nbsp;and enthusiastic attitude with&nbsp;a&nbsp;strong sense&nbsp;of ownership&nbsp; Strong communication&nbsp;skills, both verbal and written&nbsp;&nbsp; Desirable&nbsp; Hands-on experience with Kubernetes for container orchestration.&nbsp; Knowledge of real-time communications (SIP, RTP, etc.) is a plus.&nbsp; Experience&nbsp;with&nbsp;Backbone,&nbsp;Handlebars.&nbsp; Experience with automated testing frameworks (Nightwatch)&nbsp; &nbsp; Other Requirements&nbsp; This position requires the ability to be On Call.&nbsp; &nbsp; Key Relationships&nbsp; There are no direct reports&nbsp;to&nbsp;this role. 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; This is not a customer-facing role.&nbsp; &nbsp; &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;The team The Voice Application &amp; Configuration Services (VACS) team delivers crucial voice call control and AMD capabilities for Five9 customer call/contact centre solutions. Our focus is on 99.999% up time and robust application that enables real-time communication. We develop application for Linux platform using Java and Kotlin languages, use Kafka &amp; Kafka Connect for robust and scalable architecture, as well as interface with multiple AMD vendors. The accuracy and fine tuning of AMD plays a critical role in efficient utilization of contact centre resources by our customers while ensuring best customer experience. In addition, the services we develop serves as backbone in providing holistic solution for our customers.&nbsp;&nbsp; Role purpose&nbsp; This role&nbsp;aims&nbsp;to&nbsp;identify&nbsp;customers’&nbsp;business&nbsp;problems, master the&nbsp;VoIP&nbsp;(Voice over IP) domain, implementation of advanced features and through continuous enhancement of Five9’s&nbsp;call control&nbsp;services,&nbsp;help realize customer value&nbsp;and&nbsp;provide&nbsp;ongoing support.&nbsp;This role requires an excellent understanding of&nbsp;Object Oriented&nbsp;Programming, VoIP&nbsp;technologies and involves close collaboration with other teams in&nbsp;Five9 organization.&nbsp;&nbsp; Key Responsibilities: Manage the day-to-day operational and tactical aspects of multiple customer services issues and escalations.&nbsp; Effectively communicate plans,&nbsp;progress&nbsp;and status.&nbsp; Implement, troubleshoot, and support the&nbsp;Five9 Voice&nbsp;call control &amp; configuration services.&nbsp; Be part of an agile team to develop a scalable,&nbsp;highly available&nbsp;global voice platform. &nbsp; Understand performance and scalability principles and apply when developing software. &nbsp; Required Skills and Qualifications: 2&nbsp;years of industry experience in software development.&nbsp; &nbsp; Hands on experience&nbsp;with Object Oriented Programming using&nbsp;Java&nbsp;and Kotlin.&nbsp; Experience with&nbsp;VoIP&nbsp;technologies and their integration.&nbsp; Experience in troubleshooting tools&nbsp;and good debugging skills. &nbsp; Strong analytical and fault-finding skills and an ability to work under pressure&nbsp;&nbsp; Experience working within an Agile/Scrum team. &nbsp; Positive,&nbsp;self-motivated&nbsp;and enthusiastic attitude with a&nbsp;strong-sense&nbsp;of ownership. &nbsp; Strong communication&nbsp;skills, both verbal and written.&nbsp; Bachelor’s degree (or equivalent&nbsp;/above) in relevant discipline.&nbsp; Good to have:&nbsp; Good understanding of VoIP protocols like SIP, RTP, RTCP, WebRTC.&nbsp; Experience with&nbsp;MySQL or PostgreSQL.&nbsp; Experience with Contact Centre, IVR, Virtual Agents&nbsp;and telecommunications service providers is&nbsp;advantageous.&nbsp; &nbsp; Other requirements&nbsp; This position requires the ability to be On Call&nbsp;(roster based).&nbsp; This position requires to be flexible to work with people from both US and Australia at least.&nbsp; &nbsp; &nbsp; &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 I | 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;The&nbsp;team The Voice Application &amp; Configuration Services (VACS) team delivers crucial voice call control and AMD capabilities for Five9 customer call/contact centre solutions. Our focus is on 99.999% up time and robust application that enables real-time communication. We develop application for Linux platform using Java and Kotlin languages, use Kafka &amp; Kafka Connect for robust and scalable architecture, as well as interface with multiple AMD vendors. The accuracy and fine tuning of AMD plays a critical role in efficient utilization of contact centre resources by our customers while ensuring best customer experience. In addition, the services we develop serves as backbone in providing holistic solution for our customers.&nbsp;&nbsp; Role purpose&nbsp; This role&nbsp;aims&nbsp;to&nbsp;identify&nbsp;customers’&nbsp;business&nbsp;problems, master the&nbsp;VoIP&nbsp;(Voice over IP) domain, implementation of advanced features and through continuous enhancement of Five9’s&nbsp;call control&nbsp;services,&nbsp;help realize customer value&nbsp;and&nbsp;provide&nbsp;ongoing support.&nbsp;This role requires an excellent understanding of&nbsp;Object Oriented&nbsp;Programming, VoIP&nbsp;technologies and involves close collaboration with other teams in&nbsp;Five9 organization.&nbsp;&nbsp; Key Responsibilities: Manage the day-to-day operational and tactical aspects of multiple customer services issues and escalations.&nbsp; Effectively communicate plans,&nbsp;progress&nbsp;and status.&nbsp; Implement, troubleshoot, and support the&nbsp;Five9 Voice&nbsp;call control &amp; configuration services.&nbsp; Be part of an agile team to develop a scalable,&nbsp;highly available&nbsp;global voice platform. &nbsp; Understand performance and scalability principles and apply when developing software. &nbsp; Mentor and train junior team members.&nbsp; Required Skills and Qualifications: 5+ years of industry experience in software development.&nbsp; &nbsp; Hands on experience&nbsp;with&nbsp;&nbsp; programming using&nbsp;Java&nbsp;(8 &amp; 17)&nbsp;and Kotlin.&nbsp; Spring and Spring Boot frameworks&nbsp; Unit and integration testing&nbsp;&nbsp; Hands on experience with Kafka, Kafka Connect and&nbsp;Debezium&nbsp;Connectors.&nbsp; Experience with&nbsp;VoIP&nbsp;technologies and their integration.&nbsp; Experience in troubleshooting tools, audio media&nbsp;analysis&nbsp;and good debugging skills. &nbsp; Strong analytical and fault-finding skills and an ability to work under pressure&nbsp;&nbsp; Experience working within an Agile/Scrum team. &nbsp; Positive,&nbsp;self-motivated&nbsp;and enthusiastic attitude with a&nbsp;strong-sense&nbsp;of ownership. &nbsp; Strong communication&nbsp;skills, both verbal and written.&nbsp; Bachelor’s degree (or equivalent&nbsp;/above) in relevant discipline.&nbsp; Good to have:&nbsp; Good understanding of VoIP protocols like SIP, RTP, RTCP, WebRTC.&nbsp; Experience with&nbsp;MySQL or PostgreSQL.&nbsp; Experience with Contact Centre, IVR, Virtual Agents&nbsp;and telecommunications service providers is&nbsp;advantageous.&nbsp; Other requirements&nbsp; This position requires the ability to be On Call&nbsp;(roster based).&nbsp; This position requires to be flexible to work with people from both US and Australia at least.&nbsp; &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 | 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; About Five9 Five9 is a leading provider of cloud contact center solutions, enabling businesses to deliver exceptional customer experiences. Our mission is to ensure reliability, scalability, and innovation in real-time communication systems. About the Team The VACS team delivers critical voice call control and AMD (Answering Machine Detection) capabilities for Five9’s global contact center solutions. We focus on 99.999% uptime, robust applications, and real-time communication. Our stack includes Linux, Java, Kotlin, Kafka, and Kafka Connect, interfacing with multiple AMD vendors to optimize resource utilization and customer experience. Role Purpose As a Senior Software Engineer, you will: Solve complex business problems in the VoIP domain. Implement advanced features and continuously enhance Five9’s call control services. Collaborate across teams to deliver scalable, highly available voice platforms. Key Responsibilities Manage operational and tactical aspects of customer service issues and escalations. Implement, troubleshoot, and support Five9 Voice call control &amp; configuration services. Develop software applying performance and scalability principles. Mentor and train junior team members. Communicate plans, progress, and status effectively. Required Skills &amp; Qualifications 5+ years of software development experience. Strong expertise in Java (8 &amp; 17) and Kotlin. Experience with Spring/Spring Boot, Kafka, Kafka Connect, and Debezium Connectors. Hands-on experience with VoIP technologies and troubleshooting tools. Strong debugging and analytical skills. Agile/Scrum experience. Bachelor’s degree (or equivalent) in a relevant discipline. Preferred Skills Knowledge of VoIP protocols (SIP, RTP, RTCP, WebRTC). Experience with MySQL/PostgreSQL. Exposure to Contact Center, IVR, Virtual Agents, and telecom service providers. &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; About Five9 Five9 is a leading provider of cloud software for the enterprise contact center market, bringing the power of the cloud to thousands of customers and facilitating more than three billion customer interactions annually. Since 2001, Five9 has led the cloud revolution in contact centers, helping organizations transition from legacy premise-based solutions to the cloud. Five9 provides businesses with cloud contact center software that is reliable, secure, compliant and scalable, designed to create exceptional customer experiences, increase agent productivity, and deliver tangible business results. About the Team Our Global Voice team is looking for a committed, experienced Software Engineer II 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 your existing expertise with new learnings to craft innovative solutions that serve our customers and partners. Role Responsibilities Participate as a member of an Agile Scrum team practicing DevOps. Write clean and well-documented code and tests Deliver your code as part of an overall solution running in the public cloud Required Skills &amp; Qualifications 3+ years of hands‑on experience developing microservices using Java/Kotlin with the Spring Boot framework. Experience working with public cloud technologies (AWS or GCP). Strong experience building and deploying cloud applications. Ability to methodically troubleshoot complex systems. Excellent communication, collaboration, and organizational skills. Strong sense of ownership and accountability. Ability and willingness to participate in on‑call rotations. Preferred Skills Experience developing REST APIs, and building unit, functional, and integration tests using JUnit. Experience using Gradle and deploying applications on public cloud environments using CI/CD pipelines. Familiarity with JavaScript/TypeScript is a strong plus. &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 | 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;Sr. Software Engineer – (Java, Microservices, GCP) About Five9 Five9 is a leading provider of cloud software for the enterprise contact center market, powering billions of customer interactions annually. Since 2001, Five9 has been at the forefront of the cloud revolution, helping organizations deliver exceptional customer experiences, improve productivity, and achieve measurable business outcomes. We are expanding our engineering team in India (Bangalore) and are seeking a Staff Software Engineer to help design, implement, and scale Five9’s next-generation cloud-native services. This role is ideal for engineers who thrive on hands-on coding, technical depth, and building complex distributed systems. Key Responsibilities Design, develop, and optimize high-performance microservices using Java and Spring Boot. Write clean, maintainable, and testable code, with a strong focus on scalability, reliability, and performance. Take ownership of services end-to-end — from design and implementation to deployment, monitoring, and ongoing operations. Collaborate with architects and senior engineers on system design, technical reviews, and problem-solving. Ensure services meet SLAs, performance metrics, and security standards. Contribute to improving CI/CD pipelines, automation, and observability to reduce manual effort and improve service reliability. Provide technical guidance and mentorship to mid-level and junior engineers through code reviews, pairing, and knowledge sharing. Stay current with evolving technologies and help evaluate and adopt tools that strengthen our platform. Required Skills &amp; Experience (Must) Strong debugging and problem-solving skills, with an ability to dive deep into complex production issues. (Must) 5-7 Years of development experience in Java Microservices. (Must) Deep expertise in Java with strong experience in Spring or Spring Boot. Proven ability to build and operate distributed, cloud-native microservices at scale. (Must) Strong experience with GCP services (e.g., GKE, Pub/Sub, BigQuery, CockroachDB, Redis). Desired: Experience with Kubernetes, containerization, and CI/CD pipelines (GitLab or similar). Practical knowledge of SQL and NoSQL databases and caching strategies. Solid understanding of system design, data structures, algorithms, and performance optimization. Understanding of Product Archietecture Preferred Skills (Nice to Have) Exposure to voice and telephony systems (SIP, RTP, IVR, call routing) or real-time communication platforms. Experience in latency-sensitive, high-throughput systems. Familiarity with Looker, analytics pipelines, and large-scale reporting systems. Familiarity with– Agile, Jira, Confluence, E2E test, etc Technology &amp; Tools Languages &amp; Frameworks: Java, Spring, Spring Boot Cloud &amp; Infrastructure: GCP (GKE, Pub/Sub, BigQuery, CockroachDB, Redis), Kubernetes DevOps &amp; CI/CD: Git, GitLab CI/CD Collaboration &amp; Documentation: Swagger, JIRA, Confluence Why Five9? As a Staff Engineer at Five9, you will work on&nbsp;core backend services that power our global cloud contact center platform. You’ll have the opportunity to tackle hard engineering problems at scale, remain deeply involved in coding, and contribute to a culture that values craftsmanship, innovation, and technical excellence — while mentoring others and shaping best practices along the way.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;Staff Software Engineer (Java, Microservices, GCP) About Five9Five9 is a leading provider of cloud software for the enterprise contact center market, powering billions of customer interactions annually. Since 2001, Five9 has been at the forefront of the cloud revolution, helping organizations deliver exceptional customer experiences, improve productivity, and achieve measurable business outcomes. We are expanding our engineering team in India (Bangalore) and are seeking a Staff Software Engineer to help design, implement, and scale Five9’s next-generation cloud-native services. This role is ideal for engineers who thrive on hands-on coding, technical depth, and building complex distributed systems. Key Responsibilities Design, develop, and optimize high-performance microservices using Java and Spring Boot. Write clean, maintainable, and testable code, with a strong focus on scalability, reliability, and performance. Take ownership of services end-to-end — from design and implementation to deployment, monitoring, and ongoing operations. Collaborate with architects and senior engineers on system design, technical reviews, and problem-solving. Ensure services meet SLAs, performance metrics, and security standards. Contribute to improving CI/CD pipelines, automation, and observability to reduce manual effort and improve service reliability. Provide technical guidance and mentorship to mid-level and junior engineers through code reviews, pairing, and knowledge sharing. Stay current with evolving technologies and help evaluate and adopt tools that strengthen our platform. Required Skills &amp; Experience (Must) Strong debugging and problem-solving skills, with an ability to dive deep into complex production issues. (Must) 7-10 Years of development experience in Java Microservices. (Must) Deep expertise in Java with strong experience in Spring or Spring Boot. Proven ability to build and operate distributed, cloud-native microservices at scale. (Must) Strong experience with GCP services (e.g., GKE, Pub/Sub, BigQuery, CockroachDB, Redis) Desired: Experience with Kubernetes, containerization, and CI/CD pipelines (GitLab or similar). Practical knowledge of SQL and NoSQL databases and caching strategies. Solid understanding of system design, data structures, algorithms, and performance optimization. Understanding of Product Archietecture Preferred Skills (Nice to Have) Exposure to voice and telephony systems (SIP, RTP, IVR, call routing) or real-time communication platforms. Experience in latency-sensitive, high-throughput systems. Familiarity with Looker, analytics pipelines, and large-scale reporting systems. Familiarity with– Agile, Jira, Confluence, E2E test, etc &nbsp; Technology &amp; Tools Languages &amp; Frameworks: Java, Spring, Spring Boot Cloud &amp; Infrastructure: GCP (GKE, Pub/Sub, BigQuery, CockroachDB, Redis), Kubernetes DevOps &amp; CI/CD: Git, GitLab CI/CD Collaboration &amp; Documentation: Swagger, JIRA, Confluence Hardware: Apple MacBook options available Why Five9? As a Staff Engineer at Five9, you will work on core backend services that power our global cloud contact center platform. You’ll have the opportunity to tackle hard engineering problems at scale, remain deeply involved in coding, and contribute to a culture that values craftsmanship, innovation, and technical excellence — while mentoring others and shaping best practices along the way.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

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&nbsp;&nbsp;&nbsp; CRM &amp; SDK team is focusing on integrating Five9 dialer into&nbsp;multiple&nbsp;CRM systems&nbsp;and works&nbsp;with variety of&nbsp;backend and&nbsp;frontend&nbsp;technologies&nbsp;&nbsp;&nbsp;&nbsp;The&nbsp;Role Purpose&nbsp; Be part of an agile team to develop a scalable,&nbsp;highly available&nbsp;global voice platform&nbsp; Collaborate with Product Managers, Architects, Engineering&nbsp;leaders&nbsp;and Test Engineers Understand performance and scalability principles and apply them when developing software&nbsp; Troubleshoot and support current platform in production (we embrace DevOps) Designs, develops, troubleshoots, debugs, and implements software code using JavaScript, Java, Spring, and related technologies&nbsp; Write unit and functional tests, be able to document and communicate clearly&nbsp;&nbsp; Skills, Competencies and Qualifications Required&nbsp; 5+ years of industry experience in backend development (Java)&nbsp; 5+ years of industry experience in frontend development (JavaScript, TypeScript, React)&nbsp; Deep knowledge and experience with frameworks such as Spring&nbsp; Hands on Experience in designing and implementing scalable, high performing Microservices providing REST APIs&nbsp; Strong&nbsp;expertise&nbsp;in web development technologies, including HTML, CSS, and modern front-end frameworks.&nbsp; Experience working with cloud platforms such as GCP or AWS.&nbsp; Expertise&nbsp;server-side technologies and databases (SQL or NoSQL).&nbsp; Experience working on complex problems spanning multiple products and systems&nbsp; Experience working within an Agile/Scrum team Positive,&nbsp;self-motivated&nbsp;and enthusiastic attitude with&nbsp;a&nbsp;strong sense&nbsp;of ownership&nbsp; Strong communication&nbsp;skills, both verbal and written&nbsp;&nbsp; Desirable&nbsp; Hands-on experience with Kubernetes for container orchestration.&nbsp; Knowledge of real-time communications (SIP, RTP, etc.) is a plus.&nbsp; Experience&nbsp;with&nbsp;Backbone,&nbsp;Handlebars.&nbsp; Experience with automated testing frameworks (Nightwatch)&nbsp; &nbsp; Other Requirements&nbsp; This position requires the ability to be On Call.&nbsp; &nbsp; Key Relationships&nbsp; There are no direct reports&nbsp;to&nbsp;this role. 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; This is not a customer-facing role.&nbsp; &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;&nbsp; About the Team The Voice Client Team is responsible for delivering critical voice call capabilities for our customer call and contact centre solutions. Our focus is on providing high-quality audio and seamless communication experiences. The team develops native applications for macOS and Windows, along with web-based applications using the latest web technologies. We work closely with our customers to understand their needs, quickly address concerns, and continuously enhance our products—ensuring exceptional customer experience and measurable business impact. Role Purpose The role is focused on identifying customer challenges, leveraging the Five9 Voice Platform, and delivering customer value through solution implementation and ongoing support. This position involves close collaboration with cross-functional teams and occasional direct interaction with customers. Key Responsibilities Work as part of an agile team to design and develop a scalable, highly available global voice platform. Apply performance and scalability principles in software development. Collaborate with Product Managers, Architects, Engineering Leads, and QA Engineers to deliver robust solutions. Mentor and guide junior developers to foster a culture of technical excellence. Participate in code reviews and contribute to continuous improvement initiatives. Required Skills and Qualifications 5+ years of experience in software development and VOIP system troubleshooting. Strong understanding of WebRTC (in browsers) and/or SIP signalling. Expertise in JavaScript, with at least 2 years of hands-on experience in&nbsp;Java (preferred) or C++. Experience with debugging, audio media analysis, and use of troubleshooting tools. Proven experience in solving complex technical problems within distributed systems. Familiarity with Agile/Scrum methodologies. Strong ownership mindset, proactive attitude, and excellent communication skills. Bachelor’s degree (or higher) in Computer Science, Engineering, or a related field. Preferred / Desirable Skills Understanding of VOIP protocols such as SIP, RTP, RTCP, and other network protocols. Experience in Telecom or IoT domains. Background in Contact Centre, IVR, Virtual Agents, or Telecommunication Service Provider environments. Additional Information This position requires on-call availability as part of the support 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.

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