Staff Software Engineer | Core Backend

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.

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.

• →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

• Strong debugging and problem-solving skills, with an ability to dive deep into complex production issues
• 7-10 Years of development experience in Java Microservices
• Deep expertise in Java with strong experience in Spring or Spring Boot
• Proven ability to build and operate distributed, cloud-native microservices at scale
• Strong experience with GCP services (e.g., GKE, Pub/Sub, BigQuery, CockroachDB, Redis)
• 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

• 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

• Languages & Frameworks: Java, Spring, Spring Boot
• Cloud & Infrastructure: GCP (GKE, Pub/Sub, BigQuery, CockroachDB, Redis), Kubernetes
• DevOps & CI/CD: Git, GitLab CI/CD
• Collaboration & Documentation: Swagger, JIRA, Confluence
• Hardware: Apple MacBook options available