Job

Job

Performance Tester

Job type:Contract
Town/City:London
County:London
Salary/Rate:£420 - £470 per day + Outside IR35 Hybrid working
Business Sector:IT
Job ref:BBBH153820
Post Date:February 02, 2026

Performance Tester

+6 months +
+Hybrid - London 2 days a week

+Outside IR35

+£420 - £470 a day

We are seeking an experienced Performance Tester to help ensure our systems are scalable, reliable, and meet agreed performance targets across business-critical digital services.

You will play a key role in validating system behaviour under load, identifying bottlenecks, and providing clear, actionable insight to delivery teams to drive performance improvements.

Key Responsibilities

  • Design, build, and execute performance, load, and stress tests across complex systems

  • Analyse test results and produce clear reports highlighting risks, constraints, and improvement actions

  • Work closely with developers, architects, and delivery teams to validate fixes and optimise performance

  • Contribute to performance test strategies and best practices

  • Support continuous improvement of tooling, approaches, and reporting

Essential Skills & Experience

  • Proven experience in performance testing within modern digital environments

  • Strong hands-on experience with tools such as:

    • JMeter

    • Gatling

    • Azure Load Testing or similar cloud-based load testing platforms

  • Solid understanding of performance metrics (throughput, latency, response times, error rates, etc.)

  • Experience analysing results and communicating findings clearly to both technical and non-technical stakeholders

  • Comfortable working in agile delivery teams

Desirable

  • Experience integrating performance testing into CI/CD pipelines

  • Cloud platform experience (Azure preferred)

  • Background in performance engineering or non-functional testing strategies

If you'd like to discuss this Performance Tester in more detail, please send your updated CV to chloe.manerowski@cbsbutler.com and I will get in touch.