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C# Software Engineer

Job in Stevenage, Hertfordshire, SG1, England, UK
Listing for: Fynity
Full Time position
Listed on 2026-02-14
Job specializations:
  • Software Development
    Software Engineer, C# / Unity Developer
Salary/Wage Range or Industry Benchmark: 60000 GBP Yearly GBP 60000.00 YEAR
Job Description & How to Apply Below

Salary up to £60,000 + bonus & excellent benefits

Hybrid working (2–3 days on-site)


** This role will require you to go through SC clearance, you must be British**

Are you a C# Software Engineer who wants to work on software that actually matters?

We’re looking for a proactive, passionate developer to join a highly skilled team working on real-time simulation and experimentation for some of the world’s most advanced defence systems. This is a chance to work at the cutting edge of technology, where your code directly supports security and complex system development.

You’ll help build high-performance, real-time software used across the full product lifecycle, including:

  • Developing real-time C# (and some C++) software for complex simulations
  • Integrating hardware, models, and synthetic environments
  • Supporting visualisation, experimentation, verification & validation, and training systems
  • Working in an Agile (Scrum) environment with modern engineering practices
  • Helping deliver realistic, end-to-end representations of weapon systems
What we’re looking for

You don’t need to tick every box, but you’ll ideally have experience with:

  • C# software development (C++ exposure is a bonus)
  • Real-time or high-performance systems
  • CI/CD pipelines and configuration control
  • Agile ways of working
  • Software used alongside hardware or simulated environments

Most importantly, you’ll be working on parallel programmes so having varied work experience in complex environments is key.

What’s in it for you
  • Salary up to £60,000
  • Company bonus (up to £2,500, performance-based)
  • Pension contributions up to 14%
  • Paid overtime opportunities
  • Up to 15 additional flexi-leave days
  • Flexible and hybrid working options
  • Enhanced parental leave policies
  • Subsidised meals, free parking, and excellent on-site facilities
  • Inclusive culture with strong employee-led networks

If you’re looking for a role where you’ll be creating exciting, bespoke engineering products from scratch then send your CV across ASAP!

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