Principal Software Engineer

Location: Luton (Hybrid: 4 days on-site, 1 day remote)

Contract: 12 months

IR35: Inside IR35

Security Clearance: Full UK SC required upon application

Day Rate: Competitive (please enquire)

About the Role

We need experienced C# .net developers who can work with the minimum of supervision to deliver current and future programs. Working within our Integrate Mission Solutions sector of the Electronic Warfare Line of Bussiness this role provides an opportunity to work on the latest defence technology within a mature development environment.

What You’ll Do

• Develop robust applications using C# .NET within a Windows environment.
• Take ownership of complex tasks across the full software lifecycle—from requirements to integration, testing, and delivery.
• Apply object-oriented design principles and verification/validation techniques.
• Collaborate with a skilled team while maintaining independence in your work.

What We’re Looking For

• Proven experience in C# .NET development including Web Based applications.
• Strong understanding of object-oriented design and software development methodologies.
• Experience across the full software lifecycle including automated testing frameworks and practices.
• Experience of Continuous Integration / Continuous Delivery (CI / CD) practices.
• Ability to work independently and deliver high-quality solutions with minimal supervision.
• Experience with Agile methodologies (Scrum, Kanban) and microservices architecture.
• Defence or Electronic Warfare domain experience.
• Familiarity with frameworks/tools such as WPF, WinForms, Visual Studio.
• DOORS, Cameo, and Azure DevOps.

Why This Contract?

• Immediate start (subject to onboarding and SC Clearance).
• Hybrid working model for flexibility (4 days on-site, 1 day remote).
• Opportunity to work on innovative defence technology with a high degree of autonomy.
• Long-term project with strong potential for extension.