Senior M365 Engineer

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Job Title: Senior Microsoft 365 Engineer

Location: London, UK

Job Type: 06 months contract with a possibility of extension

About the Role

Are you an experienced Microsoft 365 professional with deep expertise in Exchange Online and enterprise messaging?

We are looking for a Senior Microsoft 365 Engineer to support, secure, and enhance our global Microsoft 365 environment. Serving as our London-based Subject Matter Expert (SME), you will work closely with our global engineering team to drive platform optimization, messaging security, and high-impact migration initiatives.

In this role, you will be at the forefront of our collaboration and security strategy-from implementing M365 compliance policies to assisting with a major Mimecast to Microsoft 365 migration. If you are passionate about platform-level engineering and ready to take ownership of enterprise-scale M365 services, we want to hear from you.

Key Responsibilities

• Core Administration: Administer, support, and optimize core Microsoft 365 services, including Exchange Online, Teams, SharePoint Online, and OneDrive.
• Subject Matter Expertise: Act as the local M365 technical SME in London, actively participating in governance, strategy, and stakeholder meetings.
• Messaging & Mail Flow: Support, configure, and troubleshoot complex Exchange Online mail flow, routing, and messaging services.
• Migration Projects: Play a key role in email security and migration projects, specifically an upcoming Mimecast to Microsoft 365 migration, as well as OneDrive and file migration initiatives.
• Security & Compliance: Implement and maintain robust retention, eDiscovery, and compliance policies to meet regulatory standards.
• Innovation & Architecture: Collaborate with global teams on M365 architecture improvements and the adoption of cutting-edge features, including Microsoft Copilot.
• Escalation & Monitoring: Monitor M365 service health, resolve advanced escalated incidents, and provide authoritative guidance on security and best practices.

Required Experience

• 8+ years of progressive IT experience, with a strong, dedicated focus on Microsoft 365 platform engineering.
• 5+ years of hands-on experience administering Exchange Online in large-scale enterprise environments.
• Deep technical knowledge of mail flow, transport rules, and enterprise messaging security.
• Proven experience managing Azure AD / Entra ID and Intune.
• Strong background supporting and configuring SharePoint Online, Teams, and OneDrive.
• Hands-on experience implementing M365 compliance features (retention policies, eDiscovery, etc.).
• Experience working with enterprise email security platforms such as Mimecast, Proofpoint, or similar.
• Bonus: Strong PowerShell scripting and automation capabilities are highly desirable.
• Previous experience working in large enterprise or strictly regulated environments.

Is This Role Right For You?

Please Note: This is a highly specialized, platform-level Microsoft 365 engineering position focusing heavily on Exchange Online and backend messaging services.

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