Contract Software Engineers – C# .NET & Ada

We are recruiting multiple experienced Contract Software Engineers to support current and future programmes within a leading defence and Electronic Warfare organisation. These roles sit within a mature engineering environment, delivering mission-critical software across advanced platforms. This advert covers two separate contract roles, each with its own focus, responsibilities, and skill requirements. Role 1: Contract Software Engineer – C# .NET Location: Luton (Hybrid – 4 days onsite, 1 day remote) Security Clearance: Full UK SC required (sole UK nationality essential) Role Summary We are seeking experienced C# .NET Software Engineers who can work with minimal supervision to deliver robust, high-quality software for current and future Electronic Warfare programmes. The role offers the opportunity to work within a mature development environment on cutting-edge defence technology. Key Responsibilities Develop robust applications using C# .NET within a Windows environment Take ownership of complex tasks across the full software lifecycle (requirements through to delivery) Apply object-oriented design principles and verification/validation techniques Work collaboratively within skilled Agile teams while maintaining independence Contribute to CI/CD pipelines and modern development practicesEssential Skills & Experience Strong commercial experience with C# .NET, including web-based applications Solid understanding of object-oriented design and software development methodologies Experience across the full software lifecycle, including automated testing Familiarity with CI/CD practices Experience working in Agile environments (Scrum, Kanban) Ability to deliver high-quality solutions with minimal supervisionDesirable Defence or Electronic Warfare domain experience Experience with WPF, WinForms, Visual Studio Exposure to DOORS, Cameo, Azure DevOps Some C++ experience Microservices architecture experienceRole 2: Contract Software Engineer – Ada (Embedded / Real-Time) Location: Luton (Hybrid – 4 days onsite, 1 day remote) Security Clearance: Full UK SC required (sole UK nationality essential) Role Summary We are looking for an experienced real-time embedded software engineer with strong Ada expertise to support Defensive Aids development programmes across advanced Electronic Warfare systems. This role focuses on delivering high-integrity, mission-critical software within a structured engineering environment. Key Responsibilities Specify, design, develop, and test real-time embedded software in Ada Deliver software to high-integrity and mission-critical standards Own complex tasks across the full lifecycle, from requirements through to integration and target testing Collaborate closely with hardware, firmware, and systems engineering teams Support integration, verification, and validation activities within mature development frameworksEssential Skills & Experience Expert knowledge of Ada, including object-oriented design Strong debugging capability in embedded real-time environments Experience working with COTS RTOS Good working knowledge of UML Strong understanding of Verification & Validation techniques Experience in requirements engineering, hands-on integration, and target testing Background working within structured, high-assurance development processesDesirable Defence / Electronic Warfare domain experience Experience with Dimensions, DOORS, Rhapsody, VxWorks Experience with AdaCore GNAT Pro and VectorCAST Development to RTCA/DO-178B or equivalent safety-critical standardsMeridian Business Support is a recruitment specialist acting on behalf of our client as an Employment Business for this vacancy