Henderson Scott
Lead Security Architect
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Lead Security Architect (Defence DevSecOps and AI/ML)
Location: Portsmouth
Working model: Remote 50% and 50% onsite
Start date: approx. 24/08/2026
Duration: 23/11/2026
Rate: £640 to £700 inside IR35 through an FCSA approved umbrella
Active MOD SC clearance and sole UK Nationality is required for consideration.
Mission:
Own security architecture and the integration roadmap for AI/ML across multi-cloud and edge; align to client IT/cloud strategy and UK Defence priorities; enable secure multinational collaboration and high-side code promotions with repeatable assurance. Manage the Secure by Design elements of the project and own the assurance process end to end.
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Key Responsibilities
- Lead the Security elements of the program across different use cases for AI/ML development and trials.
- Chair Security Working groups and tri-nation collaboration.
- Manage security visibility and outcomes, manage senior stakeholder engagement.
- Threat and risk management; translate ambiguous requirements into testable controls.
- Define classification-aware architectures, trust boundaries, cross-domain data movement guardrails.
- Provide Security guidance and controls for complex program.
- Lead Security roadmap: DevSecOps, policy-as-code controls, risk-based CI/CD gates.
- Govern supply-chain security: artefact signing, SBOMs, provenance; adopt SLSA-style controls.
- Reduced lead time to secure release; zero-critical promotion checkpoints; supplier onboarding efficiency; executive risk communication.
- Mentor juniors
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Experience & Qualifications
- 5+ years in Cyber Security, proven multi-cloud/edge architecture.
- Defence experience; familiarity with UK guidance; at least MOD SC cleared and UK Sole national.
- Certifications: CISSP (equivalent), TOGAF
Key Attributes
This role requires essential skills of adaptability and a pragmatic and positive attitude towards security as a business enabler, the technical skills and aptitudes can be learned from the team.
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