Security Architect - Microsoft Security Platform

Colt provides network, voice and data centre services to thousands of businesses around the world, allowing them to focus on delivering their business goals instead of the underlying infrastructure. Why we need this role We are looking for a Security Architect specialising in the Microsoft Security platform (M365 E5) to join the Security and Resilience – Security Architecture team. This role acts as the design authority and subject matter expert for Microsoft security technologies, including Defender, Entra ID and Purview, and will play a key role in modernising Colt’s security posture. The successful candidate will work closely with Security Engineering, SOC, Threat Intelligence and Risk functions, as well as wider technology teams (DIO, Network Engineering, Service Delivery), to design and implement integrated, Zero Trust-aligned security architectures across the Colt estate. The role combines: Deep technical ownership of the Microsoft Security stack (E5) Security design, architecture and assurance Strategic transformation across Colt technology domains You will play a critical role in driving: Identity-driven and endpoint-focused security architecture for user-facing environments Data protection and compliance capabilities through Microsoft Purview Modern SOC enablement leveraging Defender and Sentinel telemetry alongside broader tooling The secure adoption of Microsoft Copilot and AI/LLM-driven capabilities, ensuring appropriate governance, data protection and access controls What you will do Act as the design authority for Microsoft Security architecture, covering Defender, Entra ID and Purview capabilities Define and maintain the target architecture for the Microsoft security platform, aligned to Colt’s Zero Trust strategy Lead the design and implementation of Microsoft Defender capabilities across endpoints, identities and user-facing services, ensuring integration with wider security tooling where required Define appropriate integration patterns between Microsoft Defender and non-Microsoft security tooling, particularly across server and infrastructure environments Design and deliver Microsoft Purview solutions, including Data Loss Prevention (DLP), Information Protection, Insider Risk and data governance Define and implement identity-first security controls using Entra ID (P2), including Conditional Access, MFA and Privileged Identity Management (PIM) Support the modernisation of Colt’s SOC operating model, leveraging Defender and Sentinel for user and endpoint telemetry, alongside integration of broader infrastructure data sources Conduct security architecture reviews and provide assurance for solutions leveraging Microsoft security technologies, including defining requirements and supporting formal sign-off or risk acceptance Ensure consistent deployment and operationalisation of Microsoft security capabilities at scale, across a complex, hybrid estate Ensure alignment with…