Senior Security Engineer London (2x a week) Permanent About the Role We are exclusively partnered with a leading UK retail organisation that is currently undergoing a significant digital transformation. We are seeking a technical and hands-on Senior Security Engineer to design, implement, and operate robust security controls across a complex hybrid environment. In this role, you will bridge the gap between strategy and execution, serving as a technical authority for cloud platforms, identity systems, and endpoint security. You will collaborate closely with Network, Infrastructure, and Application teams to ensure that "secure-by-design" solutions are woven into the fabric of the entire ecosystem. Key Responsibilities Hybrid Architecture & Governance: Design and implement security controls across Azure, on-prem servers, and SaaS applications while maintaining hardening standards based on CIS and NIST benchmarks. Identity & Access Security: Define standards for Entra ID and Active Directory, overseeing requirements for Conditional Access, MFA, SSO, and PIM. Threat Detection & Incident Response: Own and operate the SIEM/SOAR stack, including Microsoft Sentinel and Defender XDR, to develop detection rules and support forensic investigations. Infrastructure Hardening: Enforce secure baselines across virtualized environments (VMware/Hyper-V), Windows Servers, and Azure IaaS workloads. Data Protection: Manage the certific...