Commissioning Engineer - Mechanical

As a Commissioning Engineer – Mechanical you will work on the commissioning documentation for complex mechanical systems within a high-risk engineering environment, ensuring safe, compliant delivery in line with company procedures and legislation. Supporting the Dreadnought Submarine programme, you will create technical documentation, be a part of activities with key stakeholders including the Royal Navy, MoD and Build Operations.

• Commissioning activities for complex mechanical systems, ensuring safe, compliant and efficient delivery of assigned work packages
• Work on commissioning documentation with engineering teams, Royal Navy, MoD, Build Operations and other key stakeholders
• Research, author, review and maintain technical design documentation, test documentation and commissioning records to the required standards
• Understand mechanical testing activities, including flushing, pressure and endurance testing, and system setting to work
• Understanding the appropriate test equipment / tools for activities so these can be specified for Testing
• Represent BAE Systems during Factory Acceptance Tests, offsite test facilities, Contractors Sea Trials and other outworking requirements, including potential overseas travel

• Knowledge of mechanical system operations, Including Fluid systems and Air Systems
• Experience commissioning complex systems and plant within an engineering environment
• Experience creating technical documentation for the use of testing and commissioning
• Experience choosing test equipment and tools for specific tasks
• Understanding of mechanical flushing, pressure and endurance testing, and system setting to work
• Ability to interpret technical documentation, drawings and engineering information
• Strong understanding of safety controls, procedures and compliance requirements within a high-risk environment
• HNC qualification in Mechanical Engineering or equivalent relevant experience

As a Commissioning Engineer – Mechanical you will join a highly skilled commissioning team supporting the delivery of the Dreadnought Submarine programme, one of the UK’s largest and most complex engineering projects. You will have the opportunity to work on a first-in-class submarine programme, contribute to major commissioning milestones and develop your technical expertise within a world-class engineering environment. Relocation support packages are available across Submarines roles, subject to eligibility criteria..

We’re committed to building an inclusive workplace where everyone feels valued and supported. We welcome applications from all suitably qualified people and encourage discussion of reasonable adjustments where needed.

Please be aware that many roles at BAE Systems are subject to security and export control restrictions. Applicants must meet Baseline Personnel Security Standard, and many roles require higher levels of National Security Vetting, including 5–10 years continuous UK residency depending on the role.

Here you’ll build a career with purpose and limitless possibilities. Lifelong learning, meaningful work, and a supportive culture enable you to grow with confidence. You’ll be recognised for your contribution and supported with rewards that matter most to you.

Closing Date: 29th October 2026

We reserve the right to close this vacancy early if we receive sufficient applications. If you are interested, please apply as early as possible.

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