Senior Network Engineer Permanent London (2x a week) About the RoleWe 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 and 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 and Access Security: Define standards for Entra ID and Active Directory, overseeing requirements for Conditional Access, MFA, SSO, and PIM.Threat Detection and 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 certificate lifecycle (PKI/AD CS) and implement data classification and