Sr Software Engineer - Full Stack (React, JavaScript)

Job Description Senior Software Engineer (P9) Join us at Zendesk, where we're on a mission to power exceptional service for every person on the planet. We're accelerating that ambition by building products rooted in AI, automation, and intelligent customer experiences, because behind every interaction lies an opportunity to make a human connection. Zendesk is establishing a world-class Research & Development centre in Pune and is hiring a Senior Software Engineer to design and build scalable, reliable systems that power AI-enabled customer experiences. In this role you’ll own meaningful components end-to-end, mentor peers, and partner with Product and Design to deliver high-impact features that help Zendesk scale. Summary As a Senior Software Engineer you will drive the design and delivery of medium-to-large features and services. You’ll be expected to contribute high-quality code, make strong design decisions, improve system reliability and performance, and help develop others through mentoring and technical leadership. Success means shipping customer-focused solutions with strong operational readiness and measurable impact. What you’ll be doing Design, build, and maintain robust, scalable microservices and APIs (Java 11, Vert.x), taking non-trivial features from proposal through implementation, testing, deployment, and production monitoring. Develop and integrate frontend features (TypeScript/JavaScript, React) and ensure seamless, secure API connectivity (REST, GraphQL) between frontend and backend. Drive architecture and system design discussions; propose pragmatic solutions that balance speed, scalability, long-term maintainability, and operational cost. Instrument systems and improve reliability: define SLOs/SLIs, lead post-incident reviews, reduce operational toil, and troubleshoot performance and scalability bottlenecks. Produce clear, well-tested code and maintain comprehensive automated tests, CI/CD pipelines, and maintainable documentation to ensure production readiness. Advocate and implement modern engineering practices: reactive programming, observability, security-by-design, performance profiling, automated deployments, and infrastructure-as-code. Lead code reviews, provide constructive feedback, mentor engineers, and cultivate a high-performing, learning-focused team culture. Collaborate closely with Product, Design, QA, DevOps/SRE, and frontend teams to align priorities, APIs, and cross-team dependencies and to deliver smooth user experiences. Contribute to hiring, onboarding, and defining success criteria for new hires (first 90/180 day outcomes); influence technical strategy and roadmap for sustainable, scalable infrastructure. What you bring to the role 4 years of professional software engineering experience, including at least 2 years in full‑stack development and ~1 years with senior‑level ownership of production systems. Strong computer science fundamentals: data structures, algorithms, concurrency, and system design. Proficient in JavaScript/TypeScript and React for frontend development; 2 years hands‑on backend experience in Java (preferred) or Node.js, Go, or Python. Proven track record delivering microservices‑based applications at scale and designing scalable, maintainable services on cloud platforms (AWS, GCP, or Azure). Hands‑on experience with APIs (REST, gRPC, GraphQL), containerization (Docker), orchestration (Kubernetes), CI/CD, and automated testing practices. Practical experience with observability (metrics, logs, tracing), performance profiling, production monitoring, and incident response. Solid experience with relational and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB) and caching systems (e.g., Redis). Strong analytical and debugging skills; able to produce clear technical documentation and explain complex trade‑offs to technical and non‑technical audiences. Collaborative, growth‑minded teammate who mentors others, practices agile development, and demonstra ... (truncated, view full listing at source)