Principal Software Engineer

Job description

Principal Software Engineer

Luton

12-Month Contract

Paying up to £79p/h (Inside IR35)

Please note - due to the nature of the work, you will need to hold or be eligible to obtain a high level of UK Security clearance – please only apply if suitable

Key Responsibilities:

• 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.

Required Skillset:

• 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.
• Experience with DOORS, Cameo, and Azure DevOps.
• Defence or Electronic Warfare domain experience – desirable
• Familiarity with frameworks/tools such as WPF, WinForms, and Visual Studio.

Extra information

Status

Open

Education Level

Secondary School

Location

Luton

Type of Contract

Full-time jobs

Published at

12-01-2026

Profession type

ICT

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English