M365 & Security Infrastructure Administrator

Reference: h0unidnxxv2q12s7jhwi

We are seeking an experienced M365 & Security Infrastructure Administrator to manage, secure and continuously improve a modern Microsoft cloud environment. This role will be responsible for the administration of Microsoft 365 services, identity platforms and core security infrastructure, helping to ensure reliable, secure and compliant technology services for users across the organisation. You will work closely with infrastructure, service desk, applications and information security teams to deliver effective solutions and provide expert technical guidance.

Key responsibilities will include administering Microsoft Entra ID, Microsoft 365, Exchange Online, SharePoint Online, OneDrive, Teams and endpoint management through Microsoft Intune. You will configure and maintain conditional access, multi-factor authentication, identity governance, device compliance policies and security baselines. The role will also involve monitoring and responding to security alerts using Microsoft Defender solutions, supporting vulnerability management, investigating incidents and contributing to security improvement initiatives. You will develop and maintain technical documentation, operational procedures and configuration standards, while ensuring changes are tested, approved and implemented in line with established processes.

The successful candidate will have proven experience supporting Microsoft 365 and cloud-based infrastructure in a security-conscious environment. Strong knowledge of Azure and Entra ID administration, Microsoft Defender, Intune, PowerShell scripting, endpoint security and identity and access management is essential. Experience with Microsoft Purview, compliance controls, security incident response, backup and disaster recovery would be advantageous. You should be analytical, organised and confident in troubleshooting complex technical issues, with the ability to communicate clearly with both technical and non-technical colleagues. Relevant Microsoft certifications or equivalent practical experience are desirable. The position offers the opportunity to contribute to the development of a resilient, well-governed and secure technology environment.

£50,000.00 - £65,000.00
Per annum
Added 29/09/2026
Reference: h0unidnxxv2q12s7jhwi

M365 & Security Infrastructure Administrator

London, England, United Kingdom Permanent IT Security Manager

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