Microsoft 365 & Security Infrastructure Administrator

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We are seeking a Microsoft 365 & Security Infrastructure Administrator to manage, maintain and continuously improve a secure, reliable and modern cloud-based technology environment. This role will be responsible for the administration of Microsoft 365 services, identity and access platforms, endpoint technologies and core security controls. You will work closely with internal stakeholders and technical teams to ensure systems are resilient, compliant and aligned with business needs.

Key responsibilities will include administering Microsoft Entra ID, Microsoft 365, Exchange Online, SharePoint, Teams, Intune and related cloud services; managing user accounts, groups, licences, permissions and conditional access policies; and supporting device compliance, endpoint configuration and security baselines. You will monitor and investigate security alerts, contribute to incident response, maintain documentation and operational procedures, and support vulnerability management, patching and audit activities. The role will also involve implementing improvements through automation, scripting and policy optimisation, as well as assisting with infrastructure projects, migrations and service reviews.

The successful candidate will have proven experience administering Microsoft 365 and cloud identity environments, together with a strong understanding of Microsoft security technologies and endpoint management. Knowledge of Microsoft Defender, Intune, Entra ID, PowerShell, multi-factor authentication, conditional access and data protection principles is highly desirable. You should be comfortable troubleshooting complex technical issues, analysing logs and alerts, and communicating clearly with both technical and non-technical colleagues. Relevant Microsoft certifications or equivalent practical experience would be advantageous. A proactive, methodical approach, strong attention to detail and a commitment to maintaining high standards of security, service availability and user support are essential.

COMPETITIVE SALARY
Added 04/09/2026
Reference: qldrldgkb1ctjpba1slo

Microsoft 365 & Security Infrastructure Administrator

London, England, United Kingdom Permanent IT Security Manager

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