Software Engineer - Defence & National Security

Gloucester or London | 2-3 Days On-Site Per Week

SC Clearance Required (and eDV eligibility essential)

Build secure, mission-critical systems that help protect the UK.

We’re hiring experienced Software Engineers to work on high-impact defence and national security programmes. You’ll help deliver secure, resilient, and sophisticated software solutions that support critical operations - all within a mission-led, engineering-focused environment.

This role is ideal for engineers who want meaningful, technical work in a sector where quality and security truly matter.

The Role

As a Software Engineer, you’ll design, build and maintain software within secure, highly-regulated environments. You’ll join a multidisciplinary team of engineers, analysts and security specialists, contributing to complex systems that support UK national security.

You will work in a hybrid model, spending 2-3 days per week on-site in either Gloucester or London (secure facilities), with the remainder from home or a non-secure office depending on project needs.

?? What You’ll Be Doing

Designing and developing secure, reliable and scalable software components

Writing high-quality, well-tested code suitable for sensitive environments

Supporting CI/CD pipelines built for restricted or hybrid networks

Collaborating with systems engineers, cyber specialists and product teams

Contributing to architecture decisions and technical roadmaps

Troubleshooting complex issues across distributed and secure systems

Applying strict coding, security and governance standards

Documenting key decisions, processes and technical designs

Working with teams embedded inside defence and intelligence organisations

What We’re Looking For

Essential

Active SC clearance

Eligibility for eDV clearance (UK national or other qualifying criteria)

Software engineering experience across design, development, testing and deployment

Proficiency in one or more key languages: Java, Python, C++, C#, JavaScript

Understanding of secure software engineering principles

Experience with CI/CD pipelines and version control (Git)

Familiarity with modern development practices and automated testing

Ability to work 2-3 days per week on-site in Gloucester or London

Strong communication skills, including working with multidisciplinary teams

Desirable

Experience working in public sector, defence, national security or other highly regulated environments

Knowledge of distributed systems, event-driven architectures or messaging frameworks

Experience with Docker/Kubernetes or secure containerised systems

Familiarity with hybrid cloud or secure on-prem environments

Interest in emerging technologies, data-intensive platforms or mission systems

Who This Role Suits

You’ll thrive here if you:

Want to contribute to the UK’s defence and national security mission

Enjoy solving complex, sensitive engineering challenges

Are comfortable with structured environments and high assurance processes

Prefer collaborative, multi-disciplinary technical teams

Take pride in building secure, robust, well-engineered solutions

Security & Working Environment

Active SC clearance is mandatory

eDV eligibility is required - the role will sponsor eDV when appropriate

Must be able to work on-site 2-3 days/week in Gloucester or London

Work may require access to secure networks or classified environments

What’s in It for You

Chance to work on mission-critical systems with real societal impact

Exposure to some of the UK’s most unique engineering challenges

Strong progression routes into tech leadership, architecture or specialist roles

Training and development tailored for defence and national security engineering

Supportive engineering culture and knowledge-sharing community

?? Interested?

If you’re a Software Engineer with SC clearance, eligibility for eDV, and a passion for solving meaningful problems in defence and national security, we’d love to hear from you.

Reasonable Adjustments:

Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients.

If you need any help or adjustments during the recruitment process for any reason , please let us know when you apply or talk to the recruiters directly so we can support you.

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