Job Title: Senior/Principal Platform Systems Mechanical Engineer Job Location: Barrow-in-Furness, Onsite This position requires full-time on-site presence. Please speak to your recruiter for further details. Salary: Competitive 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. What you will be doing: In this role, you will support the development and delivery of mechanical platform systems, ensuring robust design evidence is generated to support safe and effective solutions. You will contribute to testing and commissioning activities, support issue resolution, and work closely with engineering teams to maintain design intent across complex submarine programmes. You will also mentor junior engineers, contribute to technical outputs, and engage with stakeholders to support successful programme delivery. Core Duties: Develop and deliver design evidence to justify safe and effective engineering solutions, ensuring customer confidence in system designs Specify and support the build of prototypes, products, and systems suitable for testing and validation activities Provide timely resolution of defects and issues, ensuring corrective actions are identified, tracked, and implemented Ensure engineering commitments are defined, reviewed, and delivered in line with programme requirements Support technical presentations and communications to engineering and management audiences, while keeping up to date with emerging technologies and industry developments Author and contribute to technical reports, papers, and presentations to support engineering activities and knowledge sharing Mentor and support junior engineers, providing guidance on technical matters and professional development Apply engineering expertise supported by a degree in Mechanical Engineering, Engineering, or a relevant Science discipline, with the ability to perform complex calculations, develop technical documentation, and utilise CAD and standard IT tools The Mechanical Platform Systems Team: Being part of a team, you will have a great opportunity to be involved in the planning and reactive support to ensure that the engineering aspects of testing and commissioning activities are undertaken in a safe and appropriate way whilst ensuring design intent are maintained. It’s a fantastic opportunity to be a part of some of our most complex projects to date and to have great opportunity career development. We offer relocation support across all Submarine roles, subject to meeting eligibility criteria 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. We welcome applications from all candidates and give full, fair and open consideration to everyone. If you require any reasonable adjustments during the recruitment process, please contact our recruitment team to discuss any further support you may need. Connect with us at baesystems.com/connect Security Statement 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: 19th April 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. LI-MS1 LI-Onsite