Full-Time / Permanent Role.
Hybrid – London (4-days onsite per week for first 3-months, 3-days thereafter).
Salary – £80,000–£85,000 + company benefits.
Areti are recruiting for a Senior Project Manager / Programme Manager to lead a high-impact Microsoft 365 Tenant-to-Tenant Migration programme within a complex acquisition and business integration environment.
This is a strategic role suited to an experienced programme leader with a proven track record in delivering large-scale M365 migrations within M&A, carve-outs, or organisational integration initiatives. You’ll play a pivotal role in aligning technology transformation with wider business objectives, ensuring a seamless transition for both systems and people.
This role is heavily focused on end-to-end programme delivery, stakeholder management, and governance, while ensuring successful execution of M365 migration activities across multiple business units and technical domains.
How Your Day Will Look
- Lead the end-to-end delivery of a Microsoft 365 Tenant-to-Tenant Migration programme within an acquisition or business integration.
- Develop and execute programme plans, governance frameworks, timelines, budgets, and resource strategies.
- Align migration activities with broader business integration and transformation objectives.
- Oversee all phases including planning, execution, cutover, hypercare, and business transition.
- Ensure delivery against key milestones, objectives, and success criteria.
M365 Migration & Technical Oversight
- Manage migration and consolidation across: Exchange Online, Microsoft Teams, SharePoint Online, OneDrive for Business, Microsoft Entra ID (Azure AD), Security, compliance, and identity services.
- Work closely with technical teams to ensure best practice execution and minimal disruption.
- Oversee tooling and migration partner delivery where applicable.
- Engage with senior stakeholders, including executive leadership and business units.
- Lead steering committees, governance forums, and executive reporting.
- Manage third-party vendors, system integrators, and migration partners.
- Act as the key point of contact across business and technology streams.
Risk, Governance & Change
- Identify, manage, and mitigate programme risks, issues, and dependencies.
- Drive programme governance, reporting, and financial management.
- Support business readiness, communications, training, and adoption initiatives.
- Ensure strong change management practices are embedded throughout the programme.
Experience Wanted
- Strong experience across mergers & acquisitions, business integrations, carve-outs, or divestitures.
- Deep understanding of integrating acquired businesses into existing operating models.
- Strong stakeholder management experience across executive, business, and technical teams.
- Demonstrated success managing complex, multi-stream programmes and global deliveries.
- Strong governance, financial management, risk management, and reporting capability.
- Experience managing vendors, partners, and third-party delivery organisations.
- Exposure to migration tools such as Quest, BitTitan, ShareGate, AvePoint, or CloudM (desirable).
- Relevant programme/project management certifications (PMP, PRINCE2, MSP, Agile or similar) preferred.
Key Skills
- Mergers & Acquisitions (M&A)
- Post-Acquisition Integration
- Executive Stakeholder Management
- Governance & ReportingChange & Transformation Management
- Identity & Access Management
- Digital Workplace Transformation
