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Performance Engineer

Technology

Performance Engineers hunt latency regressions, throughput ceilings, and memory leaks in production systems — turning p99 tail spikes and GC pause dumps into shipped fixes. The job is a mix of scientific investigation and low-level systems craft: run k6 / Gatling load tests until the service buckles, capture flamegraphs with async-profiler or Linux perf, tune JVM GC flags and thread-pool sizes, rewrite hot SQL paths after reading EXPLAIN ANALYZE, and own Apdex / p99 SLO targets that the business ties to revenue. In India the role is concentrated at high-traffic product companies that simply cannot afford latency: Flipkart (Big Billion Days), Hotstar/JioCinema (IPL concurrency: 50M+ simultaneous viewers in 2023), PhonePe (UPI), Razorpay, CRED, Zepto, Walmart Global Tech Bengaluru, and Adobe India — plus FAANG GCCs (Amazon, Google, Microsoft) where perf engineering is a formal discipline. A Performance Engineer is specifically hired when a DevOps or SRE generalist cannot go deep enough; this is the role that finds the 200ms extra latency hiding in an L3 cache miss, not just the one that reads the Grafana dashboard.