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Performance Test Engineer - Defence & Security

Locations: Bristol, Manchester, or Leeds (hybrid working model)

Salary: £55,000 - £80,000 per annum (depending on experience & clearance level)

Security Requirement: Active UK SC or DV clearance

Role Overview

Join a dynamic Technology & Transformation team working on critical Defence & 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 Responsibilities

• Design, 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.
  
  

• Active 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 expertise with performance testing tools (e.g., JMeter, LoadRunner, Gatling) and monitoring platforms.
• Good understanding of cloud-based architectures, API technologies, CI/CD pipelines, and performance engineering best practices.
• Excellent stakeholder engagement skills to bridge the gap between technical teams and product or service owners.
• Strong analytical and diagnostic capabilities, with a focus on quality and operational reliability.
  
  

• Competitive salary: £55k - £80k, reflective of experience and clearance level.
• Flexible hybrid working-company-supported presence across designated office cities with remote working options.
• Opportunity to work on high-impact Defence & Security technology programmes.
• Professional growth through collaboration with senior engineers, performance architects, and transformation leaders.
  
  

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Quality Assurance

• Industries

  Staffing and Recruiting

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