Senior Software Engineer

This role is a perm position.

Clearance: DV

Location:

Portsmouth - 3 days a week onsite.

• Senior hands‑on engineer for complex maintenance and upgrade work across the primary languages and interop patterns used (e.g., Python with C/C++ bindings; MATLAB/Simulink integration where relevant).
• Leads investigation of defects and complex incidents.
• Performs root cause analysis and implements durable fixes.
• Leads refactoring and high-risk changes to improve maintainability and reliability.
• Supports architecture adaptation and evolution as requirements change.
• Delivers performance improvements where needed.
• Drives codebase modernisation in line with agreed standards and tooling.
• Mentor engineers and raises quality through coaching and exemplars.
• Supports peer review and quality gates to maintain engineering discipline.
• Produces technical evidence for deliverables.
• Contributes to task planning inputs and acceptance inputs.