Senior Performance Test Engineer - k6 & JavaScript

Our client is a technology-focused organisation operating across global markets. They specialise in building scalable, high-performance systems and are committed to quality engineering and developer enablement. With distributed teams working across multiple regions, they foster a culture of continuous learning and technical excellence. The company invests in modern tooling and infrastructure, including cloud platforms, containerisation and observability solutions, to deliver robust applications that meet demanding performance standards.

• 8-10 years of experience in performance testing and quality engineering
• Strong proficiency in JavaScript (ES6+) with proven experience developing automated tests
• Hands-on expertise with k6 performance testing framework
• Experience testing REST APIs, GraphQL APIs and web applications
• Knowledge of performance engineering methodologies and performance tuning techniques
• Experience with CI/CD pipelines (GitHub Actions, GitLab CI, Azure DevOps, Jenkins)
• Proficiency using Git and collaborative development workflows
• Practical experience with Docker and Kubernetes
• Familiarity with cloud platforms (AWS, Azure, or GCP)
• Experience using observability tools (Grafana, Prometheus, Application Insights or similar)
• Excellent problem-solving and analytical skills
• Strong communication and stakeholder management abilities
• Ability to influence technical direction and drive quality initiatives
• Passion for quality engineering and developer enablement
• Continuous learning mindset and curiosity about emerging technologies
• Ability to work effectively across global, distributed teams

• Design and develop automated performance test frameworks using k6 and JavaScript (ES6+)
• Test REST APIs, GraphQL APIs and web applications to identify performance bottlenecks
• Implement performance engineering methodologies and recommend tuning strategies
• Integrate performance tests into CI/CD pipelines using GitHub Actions, GitLab CI, Azure DevOps, or Jenkins
• Collaborate with engineering teams using Git and established development workflows
• Deploy and manage tests using Docker and Kubernetes in cloud environments
• Monitor system performance using observability tools such as Grafana, Prometheus, or Application Insights
• Communicate findings and recommendations clearly to technical and non-technical stakeholders
• Influence technical direction and quality standards without direct authority
• Support global teams across different time zones and geographical locations
• Continuously learn and adopt emerging performance testing tools and techniques