Performance Testing Expert Architect (k6)

XM is a company focused on trading platforms, emphasizing performance, scalability, and reliability in a high-throughput, low-latency environment.

• 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
• Experience integrating testing into CI/CD pipelines (GitLab CI, Jenkins)

Nice to have:

• 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

• 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 junior engineers within the team over time