MOD DV Cleared Senior Software Engineer

MOD DV Cleared Senior Software Engineer. Permanent position located Portsmouth / Home (on site 3 days a week). Salary: £80,000 – £90,000 (benefits). This is a hands‑on senior engineering role focused on maintaining, improving and evolving complex software systems.

• Lead hands‑on software maintenance, enhancement and upgrade work across complex codebases.
• Investigate defects, incidents and technical issues, carrying out root‑cause analysis and implementing robust fixes.
• Refactor and improve existing software to increase maintainability, reliability and performance.
• Support architecture adaptation and evolution as system requirements change.
• Work across Python‑based systems, including integration with C/C++ components or bindings where required.
• Contribute to codebase modernisation, engineering standards, tooling improvements and quality processes.
• Support performance analysis and deliver improvements where needed.
• Mentor engineers, provide technical guidance and help raise engineering quality across the team.
• Contribute to peer review, quality gates and engineering governance.
• Produce technical evidence, documentation and supporting material for project deliverables.
• Support planning activity, estimation, acceptance criteria and delivery inputs.

• Strong hands‑on software engineering experience in complex technical environments.
• Strong Python development skills.
• Experience working with C or C++ codebases, bindings, integrations or interoperability is highly beneficial.
• Experience maintaining, refactoring, or modernising existing/legacy software systems.
• Strong debugging, problem‑solving and root‑cause analysis skills.
• Ability to investigate complex incidents and deliver durable, well‑engineered fixes.
• Understanding of software architecture, maintainability, reliability and performance considerations.
• Experience with peer review, engineering standards, quality gates and technical documentation.
• Ability to mentor other engineers and provide technical leadership in a hands‑on capacity.
• Comfortable working in structured delivery environments where evidence, quality and engineering discipline are important.
• Desirable:
  Experience with MATLAB or Simulink integration.
• Desirable:
  Experience working on scientific, engineering, defence, aerospace, simulation, modelling or complex systems software.
• Desirable:
  Exposure to performance optimisation, systems integration or software used in high‑assurance environments.
• Desirable:
  Experience supporting architecture evolution or major codebase upgrade programmes.