Security Engineer

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Security Engineer – Bristol (Hybrid)

Security Clearance: SC (Eligible)

Are you passionate about securing the future of critical technology? Do you have deep working knowledge of NIST standards and Defence Standards like Def Stan 05-138 Issue 3 and Def Stan 05-139 Issue 1?

We’re hiring a Product Security Engineer to help shape the security architecture of next-generation defence and technology systems. This is a high-impact role where your expertise in threat modelling, risk assessment, and secure-by-design engineering will drive innovation and resilience from day one.

What You’ll Be Doing:

• Leading product risk assessments and driving security improvements across the full development lifecycle.
• Conducting threat modelling and collaborating closely with engineers to embed security at every layer.
• Applying your hands-on knowledge of Def Stan 05-138 and 05-139 to ensure products meet UK defence requirements.
• Leveraging the NIST 800 series (an absolute must) to establish best-in-class security frameworks.
• Performing code reviews, penetration testing, and guiding remediation efforts.
• Producing clear, robust documentation such as RMADS and Security Assurance artefacts.

What You Bring:

• Proven experience with NIST 800-30, 800-37, 800-53 and related frameworks. (Essential)
• Practical, working knowledge of Defence Standards, especially Def Stan 05-138 and Def Stan 05-139.
• Familiarity with threat modelling tools and methodologies.
• Solid understanding of ISO 27001/2, ISO 31000, and JSPs.
• Strong communication skills with the ability to simplify complex risks for non-technical stakeholders.
• A passion for secure design, ethical problem solving, and delivering high-assurance solutions.

You’ll Thrive In This Role If You:

• Enjoy working at the intersection of engineering, cyber, and defence.
• Are detail-oriented and solutions-driven with a calm, analytical approach to security challenges.
• Can manage multiple projects and priorities in a dynamic, agile environment.

• Seniority level
  
  Mid-Senior level

• Employment type
  
  Full-time

• Industries Defense and Space Manufacturing, Computer and Network Security, and Information Services

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