Principal Software Engineer - C# ​/.Net

Location:

Luton (4 days per week onsite)

Duration: 12 month contract

Rate: £78ph UMB (Inside IR35)

Role details:

Our client, a leading organisation in the Defence & Security sector, is currently seeking a Principal Software Engineer specialising in C# and .NET for a contract role based in Luton. This position offers the unique opportunity to work on cutting‑edge defence technology within a mature development environment.

• 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.

• 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 with 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, Win Forms, Visual Studio.
• Knowledge of DOORS, Cameo, and Azure Dev Ops.
• Some experience with C++.

If you are an experienced C# .NET developer looking for a challenging and rewarding contract position in the Defence & Security sector, we would love to hear from you. Apply now to join our client's innovative team in Luton.