Mechanical Commissioning Engineer

Job Title: Mechanical Commissioning Engineer

Location: Portsmouth Naval Base – fully site based

Salary: Up to £46,000 depending on skills and experience

Who we are:

Join BAE Systems and you’ll be part of something bigger. As a valued member of our global colleague network, you’ll bring your unique skills and perspectives to help pioneer progress and protect what matters most. You’ll be trusted to play your part in delivering the advanced, technology-led defence, aerospace and security solutions of tomorrow, shaping a safer future, for all of us.

From the depths of the ocean, to the far reaches of space, there’s no limit to where a career at BAE Systems could take you.

Role description:

Responsible to the relevant Senior Mechanical Engineer for the commissioning, servicing, defect rectification and maintenance of marine systems on board Royal Navy Queen Elizabeth Class (QEC) Aircraft Carriers, Type 45 (T45) Destroyers, Type 23 (T23) Frigates and Hunt Class Platforms and any contracted tasking.

Core duties:

• Completing commissioning and setting to work mechanical systems such as sea water cooling systems, freshwater systems, steering and stabilising systems

• Defect diagnosis and rectification work on a variety of equipment and systems

• Providing technical guidance and support to Royal Navy personnel on the operation of their equipment to ensure optimal performance

• Being part of a team delivering designated trials and commissioning activities

• Providing support globally to the Royal Navy

Essential skills:

• Knowledge of mechanical marine systems

• Commissioning of mechanical systems within a marine environment

• Ability to fault find and diagnose defects on mechanical systems

• NVQ Level 3 & 4 to support inspection and maintenance engineering activities

The Marine Systems Services team:

The Marine Systems Services Team (MSST) carry out commissioning, setting to work and defect diagnosis of complex mechanical systems on-board Royal Navy vessels in Portsmouth Naval Base & Globally. Working as part of MSST as a commissioning engineer will provide a rewarding environment where your engineering output makes a huge difference. MSST is a small team of 8 engineers who have developed a great reputation with different project teams within BAE as well as industry partners such as the MoD and OEMs. MSST provide multiple training and educational opportunities to hone in your mechanical engineering knowledge and achieve your full potential as an engineer.

Why BAE Systems?

Here you’ll build a career with purpose and limitless possibilities. With lifelong learning and meaningful work, this is a place where you can grow your career with confidence and be empowered to be your best. You’ll be recognised for your contribution and enjoy rewards tailored to what’s most important to you and your family, support for your financial and personal wellbeing, as well as a balanced lifestyle. In an environment embracing sustainable ways of working and with a strong sense of shared purpose, our supportive culture is a place you can feel you belong and proud of the difference you make.

A place where everyone can thrive:

We’re committed to building an inclusive workplace where everyone feels valued and supported. We know that a diversity of backgrounds, perspectives and experiences strengthens our teams and is vital to the work we do.

Please be aware that many roles at BAE Systems are subject to both security and export control restrictions. These restrictions mean that factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict the roles you are eligible to perform within the organisation. All applicants must as a minimum achieve Baseline Personnel Security Standard. Many roles also require higher levels of National Security Vetting where applicants must typically have 5 to 10 years of continuous residency in the UK depending on the vetting level required for the role, to allow for meaningful security vetting checks.

Closing Date: 30th July 2026

We reserve the right to close this vacancy early if we receive sufficient applications for the role. Therefore, if you are interested, please submit your application as early as possible.

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