Senior Test Software EngineerBased on site in StevenageSalary from £45,000 - £75,000 DOE + Bonus + 14% Pension + Paid OvertimeThe software you write won’t sit behind a login screen. It will configure, verify and validate complex defence systems. It will be used in development, production and field environments. It has to work. Every time.You’ll join a multi-disciplined engineering team building high-reliability test solutions that sit between hardware and mission‑critical systems. This isn’t feature development. It’s engineering with consequence.You’ll be:Writing robust software in C, C++ or ADADeveloping high-performance test applications integrated with real hardwareWorking closely with Systems, Electronics and Test teamsSolving problems that don’t stop neatly at the edge of “software”If you enjoy writing clean, documented, dependable code and you like understanding how the whole system works, not just your module, you’ll fit well here.What you’ll bring:Strong C, C++ or ADA experienceAnalytical thinkingComfort working in safety or mission‑critical environmentsBritish citizenship or Dual national with British citizenship for security clearanceThis is engineering that directly supports national capability.If you want your work to mean something, let’s talk. #J-18808-Ljbffr