Software Engineer - Defence and National SecurityGloucester or London 2-3 Days On-Site Per WeekSC Clearance Required (and eDV eligibility essential)Build secure, mission-critical systems that help protect the UK.We''re hiring experienced Software Engineers to work on high-impact defence and national security programmes. You''ll help deliver secure, resilient, and sophisticated software solutions that support critical operations - all within a mission-led, engineering-focused environment.This role is ideal for engineers who want meaningful, technical work in a sector where quality and security truly matter.The RoleAs a Software Engineer, you''ll design, build and maintain software within secure, highly-regulated environments. You''ll join a multidisciplinary team of engineers, analysts and security specialists, contributing to complex systems that support UK national security.You will work in a hybrid model, spending 2-3 days per week on-site in either Gloucester or London (secure facilities), with the remainder from home or a non-secure office depending on project needs. What You''ll Be DoingDesigning and developing secure, reliable and scalable software componentsWriting high-quality, well-tested code suitable for sensitive environmentsSupporting CI/CD pipelines built for restricted or hybrid networksCollaborating with systems engineers, cyber specialists and product teamsContributing to architecture decisions and technical roadmapsTroubleshooting complex issues across distr