Principal Systems Engineer

Job Title: Principal Systems Engineer

Location: Frimley, Hybrid, 3 days on site weekly

We offer a range of hybrid and flexible working arrangements – please speak to your recruiter about the options for this particular role

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.

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.

What you’ll be doing:

In this role, you will provide technical ownership of CCS design, supporting the Engineering Manager in delivering in-service programmes and leading key design decisions. You will oversee project scope, manage design changes and work closely with stakeholders and suppliers to identify and address risks early. You will lead programme-level design reviews, coordinate stakeholders and manage design baselines while ensuring design governance is maintained and Certificates of Design are produced where required. You will also review and influence technical requirements and architecture to support effective system integration across sub-systems and specialist areas, while providing subject matter expertise in the integration, validation and verification of systems.

Core duties:

You’ll have extensive experience in network or software engineering, ideally with a background in operations

You’ll have the ability to take the lead on technical matters and provide expert guidance

You’ll have Chartered Engineer status or be working towards it

You’ll have familiarity with DOORS and prior hands-on experience using it

You’ll have proven experience in change management processes

The In-Service Programme team:

You will be joining the In-Service Programme team, working on the V Class, where you’ll thrive in a fast-paced environment, delivering high-quality results within tight enterprise timelines. As part of a medium-sized core team of 6-12, you’ll also collaborate with a wider group of around 30, engaging with a broad stakeholder network. This role demands technical leadership, owning challenges, proactively solving problems, and working with the right stakeholders to drive solutions forward. We offer relocation support packages across all Submarines 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.

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: 20th 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.

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