Senior Commissioning Engineer - Mechanical

As a Senior Commissioning Engineer – Mechanical (Propulsion), you’ll play a key role in delivering the commissioning of mechanical propulsion systems on the first-of-class Dreadnought submarines. Working in a highly regulated environment, you’ll ensure systems are safely commissioned, tested and brought into service while collaborating with engineering teams, build operations, the Royal Navy and the Ministry of Defence.

• Carry out commissioning activities safely and in accordance with company procedures and legislative requirements
• Liaise with Engineering, Build Operations, the Royal Navy, MoD and other stakeholders to ensure safe and compliant delivery
• Produce, review and maintain commissioning, design and test documentation to the required standard
• Mentor and support less experienced members of the team within your area of expertise
• Maintain accurate records of commissioning activities in line with company policy and regulatory requirements
• Represent BAE Systems during Factory Acceptance Tests, Contractors Sea Trials and other offsite testing activities, including opportunities for overseas travel
• Deliver assigned commissioning activities within agreed timescales and quality standards

• Knowledge of mechanical system operation, ideally including steam and condensate systems, lubricating oil systems and cooling systems
• Experience commissioning complex heavy machinery, such as diesel engines, turbo generators or steam turbine plants
• Understanding of commissioning test equipment and associated test activities
• Awareness of Nuclear Site Licence or Authorisation Conditions
• Knowledge of mechanical flushing, pressure testing, endurance testing and system setting to work
• Ability to work safely within a high-risk, highly regulated engineering environment

You’ll join the team responsible for commissioning the secondary propulsion plant on the first-of-class Dreadnought submarines. The Dreadnought programme will deliver four ballistic missile submarines to the Royal Navy, ensuring the continuation of the UK's Continuous At Sea Deterrent (CASD). This is an opportunity to contribute to one of the UK's most significant engineering programmes while working alongside experienced commissioning specialists. Relocation support packages are available across all Submarines roles, subject to meeting 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: 5th November 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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