What's the position?We are looking for a Senior Java Developer to join our Performance Engineering team and take ownership of expanding our load testing capabilities. This role is both hands-on and hands-off-keyboard: you will be the primary developer standing up Gatling as a new addition to our load testing toolbox (which currently includes Locust and k6), while also serving as a technical mentor for the team, helping developers at every level, including senior engineers new to Java, grow their skills and adopt strong development practices.
This is a high-visibility role for someone who enjoys building tooling, solving performance problems, and multiplying their impact by levelling up the people around them.
Key ResponsibilitiesLoad Testing & Tooling- Own the Gatling rollout: Design, build, and productionize a Gatling-based load testing framework from the ground up, integrating it into our existing performance engineering toolbox alongside Locust and k6.
- Design and execute load tests: Build realistic load, stress, soak, and scalability test scenarios that reflect real-world traffic patterns and business-critical workflows.
- Analyze and report on performance: Interpret test results, identify bottlenecks (application, database, infrastructure), and work with engineering teams to resolve them.
- Build reusable frameworks: Develop maintainable, well-documented Gatling simulations and supporting utilities/libraries that other engineers can extend.
- Integrate with CI/CD: Automate load test execution and reporting as part of the deployment pipeline.
Mentorship & Engineering Practices- Mentor engineers: Provide structured and informal mentorship to mid-level, junior, and senior engineers, including senior engineers from other language backgrounds, on Java fundamentals, idiomatic patterns, framework usage, and best practices.
- Champion best practices: Establish and evangelize coding standards, testing strategy, and performance-engineering best practices across teams.
- Collaborate cross-functionally: Partner with development, QA, DevOps/SRE, and architecture teams to embed performance testing earlier in the development lifecycle.
Success Measures- Gatling is fully integrated into the performance engineering toolbox with documented frameworks/patterns other engineers can use independently.
- Mid, junior, and non-Java-background senior engineers show measurable growth in Java proficiency and testing practices as a result of your mentorship.
- Load testing is a standard, automated part of the release process rather than a manual afterthought.
What are we looking for?- 5+ years of professional Java development experience, with deep knowledge of the language, JVM internals, and common frameworks (e.g., Spring/Spring Boot).
- Strong, demonstrable experience with load/performance testing concepts (throughput, latency, concurrency, ramp-up strategies, think time, correlation, etc.).
- Hands-on experience with Gatling (or very strong ability to quickly become the team's go-to Gatling expert). Scala DSL familiarity is a plus.
- Experience with at least one other load testing tool (e.g., Locust, k6, JMeter, LoadRunner) and the ability to compare trade-offs between tools.
- Solid understanding of CI/CD pipelines and integrating automated performance tests into them.
- Proven experience mentoring other engineers, comfortable explaining concepts clearly to people with widely varying experience levels, including non-Java engineers learning Java.
Skills & Competencies
- Strong communication skills; able to translate performance data into actionable recommendations for both technical and non-technical stakeholders.
Preferred qualifications
- Experience with distributed systems, microservices, and cloud infrastructure (AWS and/or Cloudflare).
- Familiarity with APM/observability tooling (e.g., Datadog, New Relic, Grafana/Prometheus) to correlate load test results with system telemetry.
- Experience building internal developer tools or frameworks used by multiple teams.
- Background in relational/NoSQL databases and how they behave under load.
- Prior experience formally leading a tooling migration or adoption effort.
- Python development experience; our existing load testing toolbox includes Locust, so familiarity with Python-based test scenarios is a plus.
- JavaScript/TypeScript development experience; we also use k6, so comfort reading/writing JS-based test scripts is a plus.
What's in it for you?We offer our employees more than just competitive compensation. Our team benefits include:
- Competitive pay and benefits
- Flexible vacation allowance
- A hybrid / remote working environment
- Startup culture backed by a secure, global brand
