Public Sector | 26-5-2026

Lead Security Architect

Duration: 12 months +

Vetting: SC secuirty clearance will be required 

Location: London (hybrid working) - ad-hoc visits to Glasgow

Essential Skills 

Security Architecture Leadership

• Leadership of security architecture for large scale cloud and workspace programmes in government or national security environments.
• Experience securing systems at SECRET or above, including sovereign cloud and secure workspace deployments.

Cloud, Workspace, Infrastructure, and AI Expertise

• Deep understanding of SECRET cloud hosting, workspace and endpoint security (DWS), identity federation, crypto, segmentation, isolation technologies, and high assurance gateways.
• Strong knowledge of secure DevOps, CI/CD controls and IaC hardening.
• Experience applying security controls to AI/ML components, including model hardening, safeguarding training data, preventing prompt or model injection attacks, and securing AI enabled features within SECRET environments.

Interoperability & Cross Domain

• Experience securing solutions that span multi?domain environments and incorporate secure client endpoint and cloud integrations.
• Prior work integrating with Defence, Law Enforcement or UKIC systems.

Technical Governance & Secure by Design

• Proven experience leading security governance for cloud, device, and workspace platforms.
• Strong systems thinking mindset applied across both hosting and end user environments.

Strategic Influence & Communication

• Ability to explain complex security architecture decisions to senior stakeholders and engineering teams.
• Experience shaping business cases, options, and assurance strategies across multiple technology domains.

Our client operates hybrid working 2-3 days into London, with occasional client site visits will be required into Glasgow.

For further details please apply including full CV.

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