Cyber Software Engineer - Security Cleared

About the role

We are seeking a Cyber Software Engineer to join a highly cleared team delivering high‑assurance cyber capabilities for UK defence and national security. The role focuses on operational technology (OT) cyber projects, working close to real systems and users in a hybrid Gloucester‑based environment.

Key responsibilities

• Develop high‑assurance software in C++ for cyber‑critical and security‑critical systems.
• Work on operational technology cyber projects, integrating software with real OT environments.
• Contribute to secure system design, implementation and verification.
• Collaborate with cyber specialists, systems engineers and end‑users.
• Support software throughout its full lifecycle within classified environments.

Required profile

• Strong C++ software engineering experience.
• Background in secure or high‑assurance systems (defence, cyber, safety‑critical, etc.).
• Solid understanding of secure coding practices and software design.
• Comfortable working on‑site in classified environments.
• Active SC, DV or eDV clearance.

Required skills

• C++
• Golang (nice to have)
• Rust (nice to have)
• Secure coding practices
• Operational technology (OT) environments
• Embedded systems development
• Low‑level development
• Vulnerability research
• Reverse engineering

What we offer

• Work on operational cyber projects with real‑world impact.
• High‑trust, technically demanding engineering environment.
• Long‑term programmes providing stability and purpose.
• Hybrid working with a strong on‑site engineering culture in Gloucester.