Cyber Software Engineer - Southampton, UK Full-time onsite role in Southampton, HampshireDay rate up to £725 per day, inside IR35Active DV clearance requiredLong-term programme delivering mission-critical national security solutions ABOUT THE COMPANY Our client is a highly trusted technology partner within the UK national security community, delivering complex, mission-critical solutions across cyber, software, and advanced analytics. They bring together engineers, scientists, and technologists to solve some of the most challenging problems in defence and security. Due to continued programme growth, they are seeking an experienced Cyber Software Engineer to join their onsite team in Southampton. THE CYBER SOFTWARE ENGINEER ROLE As a Cyber Software Engineer, you will work across the full lifecycle of secure systems, from research and reverse engineering through to design, development, testing, and operational deployment. You will contribute to projects spanning embedded devices, user equipment, servers, and cloud environments, collaborating closely with multidisciplinary teams and end clients. Key responsibilities include: Reverse engineering and analysis of complex software and firmwareDesigning and developing secure, resilient software solutionsBuilding automated testing and CI and CD pipelinesWorking across Linux, Windows, Android, and cloud-based platformsSupporting research and experimentation to solve novel technical problems CYBER SOFTWARE ENGINEER ESSENTIAL SKILLS S