Performance Test Engineer

About the Role We’re looking for a Performance Test Engineer to design, build, and own our performance testing solution. You’ll work on a scalable performance framework, simulate real-world workloads, identify system bottlenecks, and integrate performance validation into the engineering lifecycle. What You’ll Do Design and maintain performance test harnesses and load-simulation solutions from scratch. Build load, stress, endurance, scalability, and concurrency tests for complex web applications and backend services. Create realistic multi-user and high-scale scenarios using synthetic traffic and multi-client orchestration. Define performance baselines, SLOs, regression thresholds, and automated quality gates in CI/CD pipelines. Integrate performance testing with analytics and observability platforms to provide actionable insights. Analyze metrics, logs, traces, CPU, heap, and memory profiles to identify bottlenecks. Work with engineering teams to drive performance improvements and turn findings into permanent regression coverage. What We’re Looking For Required 4+ years of experience building automated test infrastructure or performance and reliability tooling for production systems with TypeScript and Node.js strongly preferred. Experience designing load, stress, or concurrency test harnesses from scratch, including synthetic traffic generation, multi-client orchestration, and result analysis. Experience with sharded or parallelized performance test execution. Solid understanding of web performance, including rendering and interaction latency, main-thread and event-loop contention, memory and garbage collection behavior, and the use of Chrome DevTools or V8 profilers to localize bottlenecks. Experience testing distributed, service-oriented backends, including gRPC microservices, PostgreSQL, and Redis or Valkey caching, and reasoning about latency under concurrent load. Experience using Playwright to drive real end-to-end user journeys. Experience with sharded or parallelized performance test execution. A strong quality mindset that treats flaky and non-reproducible tests as bugs and turns performance findings into permanent regression coverage. Experience working in a monorepo environment, ideally with Bazel. Hands-on experience using AI coding tools such as Claude Code, Cursor, or similar tools. English: Upper-intermediate (B2) + Nice to Have Experience testing spreadsheet, formula, query, or reactive dependency-graph systems. Experience testing real-time collaboration systems using Operational Transform or CRDT. Experience testing rules, automation, or trigger-action workflow engines. Experience with performance testing tools such as k6, Gatling, Locust, or Artillery. Experience with observability tools such as Grafana, VictoriaMetrics, Tempo, Prometheus, or Datadog. We offer: Flexible & remote job Paid vacation and sick leave Development opportunities in any IT direction Personal professional growth Up to 100% reimbursement of the participation in core courses and conferences