Senior Performance Test Engineer (k6)

Over deze vacature

The Role:   We are looking for a Senior Performance Test Engineer to join our high-performing team and contribute to the performance, scalability, and reliability of our trading platforms. This role involves hands-on performance testing and analysis in a high-throughput, low-latency environment, collaborating closely with development and infrastructure teams to ensure system efficiency and stability.    You will work with modern tools and practices, leveraging K6 with JavaScript/TypeScript, containerized environments (Docker, Kubernetes), and cloud-native performance strategies. While this is a technical role, there may be opportunities to mentor and guide engineers on the team as your role evolves. The main responsibilities of the position include: • Define and refine performance testing strategy across the company • Develop and maintain performance testing scripts using K6 and JavaScript/TypeScript, focusing on reusable and scalable testing approaches • Execute various types of performance tests (load, stress, soak) on REST and GraphQL APIs • Monitor and analyze test results using tools like Grafana and Prometheus, providing actionable recommendations • Collaborate with engineering teams to identify and troubleshoot system performance bottlenecks • Apply performance best practices in Spring Boot, JVM, and microservice-based environments • Integrate performance tests into CI/CD pipelines (GitLab, Jenkins) to enable continuous validation • May take on mentorship or leadership responsibilities over engineers within the team over time Main requirements: • BSc/MSc in Computer Science, or related discipline • 5+ years of hands-on experience in QA • 2+ years of experience in performance testing using tools like K6 or Gatling • Proficiency in JavaScript/TypeScript for writing test scripts • Strong experience in API performance testing (REST, GraphQL), including rate limiting and caching strategies • Familiarity with Spring Boot applications and microservices architecture • Experience working in Docker/Kubernetes environments, including performance-related configurations (HPA, resource limits, etc.) • Proficiency with monitoring/observability tools such as Grafana, Prometheus, etc. • Experience integrating testing into CI/CD pipelines (GitLab CI, Jenkins) The following will be considered an advantage: • Experience with gRPC, WebSockets, and HTTP/2 performance testing • JVM tuning and database performance optimization expertise • Familiarity with cloud-native performance strategies and service mesh technologies (Istio, Linkerd) • Exposure to distributed tracing tools like Jaeger or OpenTelemetry • Experience in managing/leading a team Benefit from: • Attractive remuneration package • Intellectually stimulating work environment • Continuous personal development and international training opportunities The Hiring Experience: What Awaits You • Let’s Connect – Intro Chat with Talent Acquisition • Deep Dive – First Interview with Your Future Team • Final Connection – Final Interview All applications will be treated with strict confidentiality!   By submitting this application, I confirm that I have read and agree to the terms of the Privacy Policy and the Confidentiality Undertaking.