Performance Test Engineer

Who we are:

Engenious is a US-based consulting agency with a global presence. Although Engenious’ main area of expertise is mobile development, it is a home for more than 40+ talented world-class engineers with domain experience in Web, Backend, and Test Automation.

Open Role:

We 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 will you do?

• Design and maintain performance test harnesses and load-simulation solutions from scratch with Playwright + Chrome DevTools Protocol instrumentation (JS heap, FPS, editortimeToDone/timeToIdle) or other tools.
• 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.

Skills, Experience and Role Expectations:

• 4+ years of experience building automated test infrastructure or performance and reliability tooling for production systems with TypeScript and Node.js strongly preferred.
• Experience with sharded or parallelized performance test execution.
• Experience designing load, stress, or concurrency test harnesses from scratch, including synthetic traffic generation, multi-client orchestration, and result analysis.
• 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 for ui performance testing scenarios.
• 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.

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.
   

Our benefits:

• Flexible & remote jobPaid vacation and sick leave
• Development opportunities in any IT direction
• Fun and friendly team
• Personal professional growth
• Up to 100% reimbursement of the participation in core courses and conferences