Experis UK
C# / .Net Developer
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Senior C# .NET Engineer | SC Cleared
12-Month Contract | Luton (4 Days Onsite, 1 Day Remote) | Inside IR35
Build technology that genuinely matters.
Most software powers businesses. This software helps protect them.
We're looking for an experienced C# .NET Engineer to join a highly capable team developing next-generation electronic warfare and mission systems used in some of the UK's most advanced defence programmes.
You'll be working on complex, real-world engineering challenges where performance, reliability and quality are critical. This is not greenfield startup experimentation or routine business applications. It's software that operates in demanding environments where failure isn't an option.
You'll join a mature engineering organisation where strong technical practices, clean architecture and high-quality delivery are genuinely valued.
What You'll Be Doing
As a Senior Software Engineer, you'll take ownership of meaningful technical challenges throughout the software development lifecycle.
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You'll be:
- Designing and building robust applications using C# and.NET
- Developing scalable software within complex mission-critical environments
- Working closely with systems, software and integration engineers
- Contributing to architecture and technical decision-making
- Implementing automated testing and quality engineering practices
- Supporting software through integration, validation and deployment
- Delivering maintainable, secure and high-performance solutions
This role offers a high degree of autonomy, trust and technical ownership.
The Technology
You'll be working within a modern engineering environment that includes:
- C#
- .NET
- Microservices Architecture
- CI/CD Pipelines
- Automated Testing
- Azure DevOps
- Object-Oriented Design
- Agile Delivery (Scrum / Kanban)
- Windows-Based Systems
What We're Looking For
We're interested in engineers who enjoy solving difficult technical problems and writing software properly.
You'll likely have:
- Strong commercial experience with C# and.NET
- Experience delivering production software across the full SDLC
- A solid understanding of software architecture and design principles
- Experience building testable, maintainable code
- Knowledge of automated testing and CI/CD practices
- Experience working within collaborative Agile teams
- The confidence to operate independently and take ownership of delivery
Get help with your application
Your very own career expert that helps elevate your application to the next level.
Most importantly, you'll care about engineering quality.
Why This Opportunity?
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Meaningful Work
Develop software that supports some of the UK's most sophisticated defence and electronic warfare capabilities.
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Long-Term Programme
12-month engagement with strong likelihood of extension.
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Technical Challenge
Complex systems, interesting problems and engineering at scale.
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High-Calibre Team
Work alongside experienced software, systems and mission engineers.
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Stability and Impact
Due to the nature of the work, active UK SC Clearance is essential and must be held prior to application.
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