Lead Technical Architect -Summer-Browning Associates is supporting our client in the Central Government who is seeking a Lead Technical Architect for an initial 6-month assignment, with the possibility of extension. Location: London HybridThe ideal candidate will bring extensive experience in enterprise cloud architecture, AI security, systems integration, and architectural governance, with the ability to translate complex technical requirements into end-to-end solutions. A strong understanding of UK government security standards and experience operating within highly secure environments.The following skills and experience are required: Enterprise Cloud ArchitectureExtensive experience leading cloud architecture across GCP and/or AWS environments.Expertise in secure Cloud Landing Zones, Identity and Access Management (IAM) hierarchies, and microservices architecture.Proven ability to design secure, scalable solutions for complex enterprise environments. AI Guardrails and Perimeter DefenceHands-on experience designing deterministic AI safety controls and secure AI architectures.Knowledge of human-in-the-loop approval mechanisms, VPC Service Controls, Workload Identity Federation (WIF), and Microsoft Entra ID.Experience establishing privacy, data protection, and Personally Identifiable Information (PII) masking controls. Strategic and Technical Architecture LeadershipProven experience leading both strategic architecture and detailed technical design.Ability to design modular ..... full job details .....