Senior Test Software Engineer

Cirrus Selection; Stevenage; On-site; GBP 45,000 - 75,000; Full time

Benefits offered by this job

Bonus

Pension 14%

Paid overtime

Job summary

Cirrus Selection in Stevenage is seeking a Senior Test Software Engineer to join an on-site engineering team. You will write robust C/C++ software that configures, verifies and validates complex defence systems used in development, production and field environments.

This role emphasizes system-level understanding and practical problem solving, not just software. You’ll collaborate with Systems, Electronics and Test teams to deliver high-performance test applications and automation in safety- or

Qualifications

• Proven strong C/C++ development experience.
• Experience building test software that interacts with hardware.
• Knowledge of automation, CI and DevOps.
• Experience with electronics measurement tools (oscilloscopes, spectrum analyzers).
• Ability to think analytically and work safely in mission-critical environments.
• Eligibility for security clearance (British citizenship or dual nationality).

Responsibilities

• Write robust C/C++ software for test solutions.
• Develop high-performance test applications integrated with real hardware.
• Collaborate with Systems, Electronics and Test teams.
• Solve cross-domain issues beyond pure software boundaries.

Skills

Strong C/C++ experience

Test software development

Automation/CI/DevOps

Electronics measurement and debug

Analytical thinking

Safety/mission-critical

Security clearance eligibility

Tools

Oscilloscopes

Spectrum analyzers

Job description

Senior Test Software Engineer

Based on site in Stevenage

Salary from £45,000 - £75,000 DOE + Bonus + 14% Pension + Paid Overtime

The 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 inC/C++
• Developing high-performance test applications integrated with real hardware
• Working closely with Systems, Electronics and Test teams
• Solving 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++ experience
• Previous software engineering experience in the development of test solutions
• A good understanding of automation, continuous integration and DevOps principles and practices
• Knowledge of electronics measurement and debug techniques using equipment such as oscilloscopes and spectrum analysers
• Analytical thinking
• Comfort working in safety or mission‑critical environments
• British citizenship or Dual national with British citizenshipfor security clearance

This is engineering that directly supports national capability.