Performance Test Engineer - Defence and SecurityLocations: Bristol, Manchester, or Leeds (hybrid working model) Salary: 55,000 - 80,000 per annum (depending on experience and clearance level) Security Requirement: Active UK SC or DV clearanceRole OverviewJoin a dynamic Technology and Transformation team working on critical Defence and Security programmes. As a Performance Test Engineer, you''ll support assurance and reliability of complex systems at scale-ensuring performance, resilience, and user satisfaction across mission-critical services.Key ResponsibilitiesDesign, execute, and analyse performance test scenarios for large-scale enterprise systems.Work closely with software engineers, operations teams, and stakeholders to define performance requirements and acceptance criteria.Lead or support performance testing in Agile delivery environments alongside DevOps, QA, and delivery teams.Identify performance bottlenecks, provide actionable insights, and collaborate with technical teams to implement optimisations.Advise on load testing tools and frameworks, simulate realistic production-like loads, and build out continuous testing capabilities.Communicate performance findings effectively to both technical and leadership audiences.Required Experience and QualificationsActive Security Check (SC) or Developed Vetting (DV) clearance required prior to starting.Proven track record in performance testing within regulated or public sector projects, ideally Defence-related.Technical ..... full job details .....