M365 Collaboration Architect

We are seeking an experienced M365 Collaboration Architect to lead the migration and integration of Microsoft 365 collaboration services from acquired company tenants into a large enterprise parent tenant. The role involves designing and executing cross-tenant migrations for Exchange Online, Microsoft Teams, SharePoint, and OneDrive while maintaining seamless collaboration between users across both environments., * Lead the discovery and assessment of existing Microsoft 365 environments, including Exchange, Teams, SharePoint, OneDrive, mail routing, tenant policies, and file shares.

• Design cross-tenant migration strategies, including mail routing, coexistence, migration waves, and cutover planning.
• Implement cross-tenant collaboration using B2B, cross-tenant synchronization, free/busy sharing, and Teams federation.
• Manage migration of Exchange Online mailboxes, Teams, SharePoint sites, and OneDrive data.
• Assess the impact of Microsoft Purview policies, including retention, DLP, and eDiscovery, during tenant consolidation.
• Identify dependencies involving shared mailboxes, line-of-business applications, identity, and network infrastructure.
• Perform hands-on migrations using Quest On Demand Migration.
• Develop automation scripts using PowerShell and Microsoft Graph API.
• Lead and coordinate a team of 2-3 engineers throughout migration planning and execution.

• 8+ years of experience in Microsoft 365 architecture, administration, and migration.
• Proven experience owning and delivering cross-tenant M365 migrations into large enterprise production environments.
• Strong expertise in Exchange Online, Exchange Hybrid, and mail routing.
• Hands-on experience with Quest On Demand Migration.
• Experience with Microsoft Purview, including retention, DLP, and eDiscovery.
• Strong PowerShell scripting and Microsoft Graph API automation skills.
• Experience with Teams, SharePoint Online, and OneDrive migrations.
• Strong understanding of tenant coexistence and cutover strategies., * Experience with Microsoft Teams telephony migration.
• Exposure to ShareGate, BitTitan, or AvePoint migration tools.
• Microsoft 365 Certified: Administrator Expert or Enterprise Administrator Expert certification.
• Previous experience leading engineers in enterprise migration projects.