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Fynity Logo Fynity · IT - Software Development

Software Security Engineer

United Kingdom, Bristol 70000.00 - 74000.00 GBP / Year · Job Posted February 17, 2026
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Job Description

Would you like to work at the sharp end of defence technology, helping secure some of the most advanced software-enabled systems in the world? The Software Security Engineer sits right at the heart of a defence-focused product portfolio. You’ll act as the Software security engineer, working across multiple programmes at once, shaping how security is designed, built and assured across a wide range of Software including embedded and non-embedded software. You will be influencing real Software engineering decisions across the full product lifecycle from early concept through to in-service support.

Job Responsibility

  • Acting as the security authority across a range of defence products
  • Guiding security decisions throughout the entire software lifecycle
  • Providing hands-on security expertise to software and wider engineering teams
  • Advising on secure architectures, design patterns, coding standards and trade-offs
  • Supporting both embedded software / firmware and more traditional software stacks
  • Running security assessments and risk analysis, identifying threats and defining mitigations
  • Supporting multiple projects in parallel in a fast-moving, classified environment
  • Producing clear, usable security documentation, reports and metrics

Requirements

  • Experience working on complex software products in defence, aerospace, automotive, telecoms or similar regulated sectors
  • Strong background in software security, with knowledge of recognised security standards and best practice
  • Able to balance security risk with real-world engineering delivery
  • Interest in emerging technologies and the evolving security threat landscape
  • Degree (or equivalent experience) in a STEM discipline

Nice to have

Embedded software or firmware experience

What we offer

  • Bonus upto 21%
  • Pension: Up to 14% total contribution
  • Flexible working supported
  • Enhanced parental leave
  • Excellent on-site facilities (subsidised meals, parking, etc.)
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