Sr Software Engineer | Engineering

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 Bangalore, India, and are seeking a Senior 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 & Experience

• Must Have: Strong debugging and problem-solving skills, with the ability to dive deep into complex production issues.
• Must Have: 3–6 years of software development experience building Java microservices.
• Must Have: Deep expertise in Java with strong experience in Spring Framework or Spring Boot.
• Proven ability to build and operate distributed, cloud-native microservices at scale.
• Must Have: Strong experience with Google Cloud Platform (GCP) services, including GKE, CockroachDB, and Redis.
• Desired: Experience with Kubernetes, containerization, and CI/CD pipelines (GitLab or similar).
• Solid understanding of system design, data structures, algorithms, and performance optimization.
• Understanding of product architecture.

Preferred Skills

• Exposure to voice and telephony systems (SIP, RTP, IVR, call routing) or real-time communication platforms.
• Experience building latency-sensitive, high-throughput systems.
• Familiarity with Looker, analytics pipelines, and large-scale reporting systems.
• Familiarity with Agile methodologies and tools such as Jira, Confluence, and end-to-end testing frameworks.

Technology & Tools

Languages & Frameworks

• Java
• Spring Framework
• Spring Boot

Cloud & Infrastructure

• Google Cloud Platform (GKE, Pub/Sub, BigQuery, CockroachDB, Redis)
• Kubernetes

DevOps & CI/CD

• Git
• GitLab CI/CD

Collaboration & Documentation

• Swagger
• Jira
• Confluence

Hardware

• Apple MacBook options available

Why Five9?

As a Senior Software Engineer at Five9, you will work on the core backend services that power our global cloud contact center platform. You will have the opportunity to solve complex engineering challenges at scale while remaining deeply involved in hands-on software development. Working alongside a highly talented engineering team, you will help build highly scalable cloud-native services, mentor fellow engineers, and contribute to a culture that values craftsmanship, innovation, technical excellence, and continuous learning.