Senior Software Engineer
Confirmed on the employer's own hiring board on Oct 11, 2026. First seen by Alion on Sep 9, 2026. BAE Systems scores B on the Alion truth index.
Job Title: Senior Software Engineer
Location: Portsmouth Broad Oak - On Site
We offer a range of hybrid and flexible working arrangements - please speakto your recruiter about the options for this particular role
Salary: Up to £58,900 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.
Job Description:
Working within a multidisciplinary engineering team developing and enhancing advanced maritime simulation software used for naval training, operational concept development, and system testing. You will play a key role in modelling complexbattlespace environments and defence systems, enabling engineering teams to validate capabilities within safe, realistic scenarios. This role offers the opportunity to improve simulation performance, enhance operational readiness, reduce development risk, and accelerate delivery of critical capabilities using modern software engineering and simulation technologies.
Core duties:
- You will design, develop, and maintain high-quality software solutions in line with project requirements
- You will produce clear, well-structured, and maintainable software designs
- You will deliver robust and reliable software solutions suitable for operational use
- You will undertake testing activities to ensure software quality, performance, and compliance
- You will maintain and enhance existing software, resolving defects and implementing new features
Essential Skills:
- You will hold a degree (BEng/BSc) in Computer Science, Engineering, or a related numerate discipline
- You will have provenexperience in at least one high-level programming language; C++, C#, Java, or Ada are highly desirable
- You will have adequate experience across the full software development lifecycle, with knowledge of methodologies such as Agile and Waterfall
- You will have a solid understanding of configuration managementprinciples, with experience using configuration managementtools
- You will have knowledge of networking concepts, including switches and routers
The MIMESIS Team:
The MIMESIS Product Team develops advanced maritime battlespace simulation software, modelling environmental conditions, platform behaviour, and complexsystems such as sonar, radar, and weapons. The team supports naval training, system validation, and capability development through realistic, high-fidelity simulation.
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 confidenceand 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 strongsense 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 controlrestrictions. These restrictions mean that factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict the rolesyou are eligible to perform within the organisation. All applicantsmustas a minimum achieve Baseline Personnel Security Standard. Many roles also require higher levels of National Security Vetting where applicantsmusttypically 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: 13th October 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.