Remote Senior Performance Test Engineer at XM

Senior Performance Test Engineer

Posted 2 days ago

XM is a leading international fintech company, committed to shaping the future of online trading through innovative solutions. Established in 2009, the XM Group has grown exponentially with a global team of over 1,400 employees around the world. Headquartered in Cyprus, XM operates from offices in Greece, UK, UAE, USA, South Africa, Belize, and Uruguay, delivering innovative, reliable, and comprehensive services in currency trading in more than 30 languages to over 10 million clients worldwide.

Guided by its core values, Big. Fair. Human., XM consistently ranks as a top-rated workplace, having received Platinum accreditation from Investors In People, alongside consistent recognition as one of the top Best Workplaces™.

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Senior Performance Test Engineer – Cyprus, Greece or Remote

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 primarily a technical, individual contributor role, there may be opportunities to mentor and guide junior engineers on the team as your role evolves.

The main responsibilities of the position include:

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
Take on mentorship or leadership responsibilities over junior 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

Benefit from: