Systems Administrator - Platform Migration & Merge Specialist (Microsoft 365, Google Workspace)

TL;DR

Systems Administrator - Platform Migration & Merge Specialist (Microsoft 365, Google Workspace): Oversee and deliver multi-phase collaboration platform consolidation, migrating business units from Google Workspace and legacy Microsoft 365 environments into a single Microsoft 365 tenant with an accent on coexistence, cutover, and controlled decommissioning. Focus on designing migration approaches for mail, calendars, contacts, files, chat, and identity, solving complex mail-flow and identity edge cases, and automating validation/reporting with PowerShell and Microsoft Graph.

Location: Basingstoke (hybrid)

Salary: £50k - 80k (pro rated for period of hire June 26 - Mar 27)

Company

hirify.global provides IT support for a group-wide collaboration platform consolidation programme.

What you will do

• Own in-flight and upcoming migrations, including Microsoft 365 tenant-to-tenant consolidation and Google Workspace to Microsoft 365 transitions.
• Design and execute migration approaches for mail, calendars, contacts, files, chat, and identity using Microsoft Migration Toolset and third-party tooling where needed.
• Manage coexistence periods (mail flow, calendar interop, free/busy visibility, delta synchronisation) and plan cutovers (MX changes, SMTP swaps, UPN transitions, retirement of source environments).
• Develop PowerShell automation and reporting that integrates with Exchange Online, Microsoft Graph, Entra ID, and SharePoint for bulk operations and validation.
• Perform discovery and risk analysis of source environments using Google Admin tools (GAM) and Microsoft Graph/PowerShell, documenting edge cases and dependencies.
• Oversee tenant decommissioning (retention, identity downgrade, licence release, tenant retirement) and provide hypercare support during and after cutovers.

Requirements

• Strong administrative expertise in Microsoft Entra ID and Microsoft 365 (Exchange Online, SharePoint Online, OneDrive, Teams) plus Google Workspace Enterprise.
• Proven experience delivering tenant-to-tenant Microsoft 365 migrations and Google Workspace to Microsoft 365 migrations.
• Strong PowerShell skills for automation and validation using Microsoft Graph, Exchange Online, and Entra ID.
• Hands-on experience with Microsoft Migration Toolset (Exchange Online migration, SharePoint and OneDrive migration tooling) and Google Workspace administration tools including GAM.
• Practical understanding of migration mail flow (accepted domain types, MX cutover, forwarding, primary SMTP and alias strategies, calendar interop configuration).
• Ability to communicate complex technical concepts to technical and non-technical stakeholders.

Culture & Benefits

• Hybrid working model: 2 days in the office per week.
• 25 days annual leave plus 8 public holidays.
• Enhanced pension scheme with 5% matching.
• Wellness support: complimentary Unmind app and onsite gym in Basingstoke.
• Additional perks including access to sporting events and tickets; Sony Group Company discounts.

Hiring process

• Interviews focused on migration delivery, technical depth, and stakeholder communication.
• Discussion of migration approach, risk handling, and automation practices.