Senior M365 Migration Engineer - M&A Integration

Enterprise M365 Migrations | M&A Integration | Project Delivery

We are seeking an immediately available and experienced Senior Microsoft 365 Solution/Migration Engineer for an initial four-month contract with a large, publicly listed organisation undergoing significant growth through ongoing acquisitions. As the organisation continues to acquire and integrate new businesses, you will play a key role in migrating their Microsoft 365 environments into an established enterprise platform.

This is a hands-on, project-focused opportunity where you will take ownership of complex migrations from initial discovery and planning through to execution, cutover and post-migration support (hypercare).

Key Responsibilities

• Lead end-to-end Exchange Online (Email), SharePoint, Microsoft Teams and OneDrive migration planning, execution and hypercare.
• Deliver complex Microsoft 365 tenant-to-tenant migrations, integrating acquired businesses into an existing enterprise environment.
• Assess existing environments, identify technical dependencies and develop migration strategies, timelines and cutover plans.
• Manage migration waves, coexistence configurations, data validation and post-migration troubleshooting.
• Utilise Quest On Demand Migration (ODM) to execute tenant-to-tenant migrations.
• Develop automation using PowerShell and Microsoft Graph to streamline migration activities.
• Collaborate with identity, network, endpoint, security and compliance teams to ensure successful integrations.
• Provide technical guidance to a small team of engineers where required.
• Develop migration documentation, runbooks and repeatable processes to support future acquisitions.

About You

• 6+ years' hands-on experience in Microsoft 365 engineering and migration delivery.
• Proven experience delivering tenant-to-tenant migrations across Exchange Online, Teams, SharePoint and OneDrive.
• Strong knowledge of Exchange hybrid environments, mail routing, coexistence and migration cutovers.
• Hands-on experience with Quest On Demand Migration (ODM).
• Strong PowerShell scripting and Microsoft Graph experience.
• Working knowledge of Microsoft Entra ID, Active Directory and Microsoft 365 security and compliance.
• Experience managing complex enterprise migrations with minimal business disruption.
• Previous mergers and acquisitions (M&A) integration experience will be highly regarded.

Why Join?

• Be part of a large-scale enterprise integration program driven by ongoing acquisitions.
• Work on complex Microsoft 365 migration projects across multiple businesses.
• Dedicated project delivery focus, with no ongoing BAU responsibilities.
• Take technical ownership of migrations from discovery through to post-cutover stabilisation.
• Opportunity to lead a small engineering team while remaining hands-on.

If you are an experienced Microsoft 365 Solutions/Migration Engineer who enjoys complex technical challenges and delivering end-to-end migration projects, we would love to hear from you.

This is a hybrid position.

Apply now or get in touch for a confidential discussion.

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