Performance Test Engineer

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Engenious

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2015

🤝 B2B

🤖 Artificial Intelligence

🔒 Cybersecurity

B2B • Artificial Intelligence • Cybersecurity

Engenious is an IT consulting and services firm that helps organizations modernize and manage their technology landscapes. The company offers cloud solutions, artificial intelligence, cybersecurity, software development, DevOps, data & analytics, QA/testing, and technical documentation. Headquartered in Kraków, Poland with an office in Zug, Switzerland, Engenious focuses on delivering technical projects and consulting services to business clients.

📋 Description

• 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.

🎯 Requirements

• 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. • 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)

🏖️ Benefits

• 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