Senior Software Engineer (C/C++)

Critical Software • southampton, england, United-Kingdom • Posted May 31, 2026

Location southampton, england
Job Type Full-time
Category IT & Technology
Posted May 31, 2026

Senior Software Engineer (C/C++) – UK Defence Programmes (SC / DV Required)

This is a senior, delivery-focused engineering role in a cleared UK defence environment—built for engineers who want to ship high-assurance software, not just talk about it.

We are hiring experienced software engineers to deliver mission-critical systems into UK defence programmes where engineering evidence matters . You will work on long-running, complex products under security, safety, and operational constraints —with the autonomy to make sound technical calls and the responsibility to stand behind them.

If you are looking for a role to “grow into seniority”, this position will feel too demanding and too exposed. We need people who can take ownership from day one in a cleared environment.

Security Clearance (Non-negotiable)

To join this programme, you’ll need to already hold active UK Security Clearance at SC or DV level ....

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