Salary: £50,000 - 50,000 per year Requirements: Strong experience in C++/C# development 2 years experience in a programming language Educational background in STEM Good understanding of computing fundamentals (e.g. logic, data structures) Strong software design skills, including Object-Oriented Programming Knowledge of version control systems such as Git/SVN Competent in Visual Studio & MS Office Products Must be eligible to work and live in the UK Must be eligible to undergo and maintain appropriate UK government Developed Vetting security clearance Knowledge of Red Hat Linux or other Unix-based operating systems (desirable) Understanding of Object-Oriented Design and engineering algorithms (desirable) Experience in an Agile environment (desirable) Responsibilities: Support ongoing maintenance and enhancement of mission-critical simulation software Work in both Windows and Red Hat Linux environments Comprehend requirement/document changes and analyse the scope of change required for work items Design, develop and maintain existing code solutions Test and review software applications and associated documentation Contribute to meetings and work groups, providing domain knowledge and expertise on technical matters Collaborate within a team environment and communicate effectively Suggest improvements for continuous improvement Technologies: C# Git Support Linux Security SVN Unix Visual Studio Windows Embedded UML More: At MASS, we are an independent, global technology company, trusted by highly secure organisations to provide advanced digital services that manage data and ensure information is kept safe. Our heritage in defence allows us to offer robust solutions in sectors where security expertise is essential. We prioritize wellbeing within our culture, empowering our employees to flourish and achieve their full potential. We take pride in our wellbeing programs and policies, which include mental health first aiders and extensive support through our employee assistance programme. We innovate with our customers to provide tailored, agile and resilient solutions that facilitate their digital transformation. As an equal opportunities employer, we value our skilled and motivated workforce and offer a friendly workplace where everyone can make an impact. Join us at our Corsham location to see how working for MASS could be the right fit for you! last updated 10 week of 2026