Principal Engineer – Software Engineering (Software Development)

Job Description

Job Title: Principal Software Engineer

Location: Frimley, Filton, or Broad Oak. We offer a range of hybrid and flexible working arrangements – please speak to your recruiter about the options for this particular role

Salary: circa £55,000

What you’ll be doing:

• Playing a key role in software engineering activities for the development and deployment of new products
• Participating in code reviews and providing constructive feedback to team members
• Developing and documenting complex software architectures and subsystems, providing evidence of fitness for purpose and customer value
• Designing, developing, and maintaining scalable applications using .NET Core / ASP.NET Core
• Taking accountability for technical work packages and verifying that customer needs are satisfied through qualification and test activities
• Working within a diverse group of engineers, providing guidance and coaching to others
• Steering new software development through the implementation of best practices

Your skills and experiences:

Essential

• Proficiency in C# and .NET core
• Proficiency in Agile toolsets (such as Atlassian, Jira, Confluence, and Bitbucket)
• Extensive expertise in the engineering lifecycle – from requirements through to delivery

Desirable

• Awareness of Maritime Combat Systems
• Relational databases (SQL Server (Lite)) on Windows/Linux platforms

Benefits:

As well as a competitive pension scheme, BAE Systems also offers employee share plans, an extensive range of flexible discounted health, wellbeing and lifestyle benefits, including a green car scheme, private health plans and shopping discounts – you may also be eligible for an annual incentive.

The Common Infrastructure and Integration Services (CIIS) Product Development team:

You will play a key role in delivering infrastructure service components that support the development of next-generation systems. Working at the heart of a high-impact program, you will collaborate closely with dedicated engineering teams to configure and deploy these advanced solutions, ensuring they are robust, scalable, and aligned with evolving technical requirements.

In parallel, you will engage with multiple project stakeholders to define, detail, design, and develop tailored infrastructure service solutions that meet our customers’ needs. By bridging technical delivery with stakeholder collaboration, you will help drive seamless integration and successful outcomes.

This role offers the opportunity to contribute to a high-profile project within the BAE Systems business, providing valuable exposure and the potential for continued growth. We offer relocation support packages across all Submarines roles, subject to meeting eligibility criteria.

Why BAE Systems?

This is a place where you’ll be able to make a real difference. You’ll be part of an inclusive culture that values diversity of thought, rewards integrity, and merit, and where you’ll be empowered to fulfil your potential. We welcome people from all backgrounds and want to make sure that our recruitment processes are as inclusive as possible. If you have a disability or health condition (for example dyslexia, autism, an anxiety disorder etc.) that may affect your performance in certain assessment types, please speak to your recruiter about potential reasonable adjustments.

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: 3rd March 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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