Senior Performance Engineer

Job Description

As Senior Performance Engineer, you will own the end-to-end performance testing lifecycle for one or more product domains at MCO. You will design and execute complex load and stress scenarios, analyse results, surface root-cause insights, and collaborate directly with development and infrastructure teams to ship fixes.

Reporting to the Performance Engineering Tech Lead, you will contribute to the tooling, scripting standards, and CI/CD integration that the Performance Engineering Centre of Enablement (CoE) is building across MCO. This is a hands-on individual contributor role — the right person will love being in the data, debugging slow queries, tuning JVM heap settings, and writing clean test scripts as much as they enjoy presenting findings to engineering and product teams.

Job Benefits

Performance Testing & Execution

• Design, build, and execute realistic load, stress, soak, and spike tests against MCO’s SaaS platform and APIs
• Develop and maintain reusable, version-controlled performance test scripts (k6, Gatling, JMeter, or equivalent)
• Define workload models and test scenarios based on production traffic patterns, SLAs, and anticipated growth
• Run tests in staging and pre-production environments and validate results against agreed performance acceptance criteria
  
  

Analysis & Root-Cause Investigation

• Analyse performance metrics, APM traces, and profiling data to identify bottlenecks across application, database, and infrastructure tiers
• Produce clear, evidence-based performance reports that distinguish symptoms from root causes and recommend actionable improvements
• Collaborate with backend, frontend, and infrastructure engineers to implement and verify performance fixes
  
  

CI/CD & Tooling Integration

• Integrate performance test suites into CI/CD pipelines (Jenkins, GitLab CI, or Azure DevOps) with automated pass/fail thresholds
• Contribute to shared performance testing frameworks, libraries, and standards being established by the Performance Engineering CoE
• Help evaluate and adopt new tooling as the function matures
  
  

Observability & Monitoring

• Work with observability teams to ensure appropriate dashboards and alerts are in place for performance KPIs in production
• Use APM tools (Dynatrace, Datadog, New Relic, or AppDynamics) to correlate test results with real-world system behaviour
  
  

Knowledge Sharing & Collaboration

• Act as a performance engineering resource for feature teams, providing guidance on writing performance-conscious code and interpreting results
• Participate in design and architecture reviews to identify potential performance risks early
• Contribute to documentation, runbooks, and best-practice guides within the CoE