M365 Enterprise Platforms Manager

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As one of the world's largest networks of audit, tax and consulting firms, RSM delivers big ideas and premium service to help middle-market businesses thrive. We are a fast-growing firm with big ambitions -- we have a clear goal to become the premium adviser to the middle market, globally. This vision touches everything we do, motivating and inspiring us to become better every day. If you are looking for a firm where you can build a future and make an impact, then RSM is the place for you.

Make an Impact at RSM UK

The M365 Enterprise Platforms Manager is a senior, business-critical leadership role responsible for the strategic direction, governance, technical authority, and migration delivery of Microsoft 365 services.

RSM is undertaking a transformation of its Microsoft 365 (M365) estate as part of a Multi-Tenant Organisation (MTO) programme. This initiative will deliver a unified, secure, and scalable collaboration platform across RSM UK, US, Canada, and Ireland.

You will act as the central authority for M365 enterprise platforms, ensuring that global tenants are intentionally architected, secure by design, governed effectively, and optimised to support a seamless multi-region operating model. The role requires deep technical expertise, strong leadership capability, and the ability to operate effectively across a complex international stakeholder landscape and multiple time zones.

You'll make an impact by:

Strategic Leadership

• Defining and leading the strategic direction of the multi-tenant M365 landscape, ensuring alignment with the broader technology strategy and global MTO roadmap. Lead decision making on tenant design, identity architecture, security boundaries, collaboration patterns, and information governance.
• Owning key architectural decisions including tenant design, identity architecture, security boundaries, collaboration models, and information governance.
• Driving adoption of new M365 capabilities to maximise business value, productivity, and continuous improvement.
• Aligning investment priorities with technology leadership and programme stakeholders, ensuring capability parity across regions whilst working to align expectations
• Establishing and maintaining architecture documentation, including current-state, target-state, and transition architectures, ensuring clarity, consistency, and traceability of design decisions across the MTO programme.

Migration Leadership & Programme Delivery

• Leading the planning, coordination, and delivery of M365 migration activities across territories.
• Overseeing technical readiness assessments, coexistence strategies, transition state architectures, and data migration planning, ensuring alignment with local technology strategies.
• Collaborating closely with global programme teams, enterprise architects, security leads, and business stakeholders to deliver a controlled and well governed migration.
• Establishing and enforcing standards for change control, configuration management, and deployment quality.

Technical Ownership of M365 Enterprise Services

• Providing authoritative expertise across all core M365 technologies, including but not limited to: Exchange Online, SharePoint Online & OneDrive, Teams & Teams Voice, Entra ID (Azure AD), Purview Compliance & Data Loss Prevention, Microsoft Security & Defender Suite, Viva Engage
• Ensuring the platform is secure, compliant, and resilient, aligned with the relevant regulatory requirements relevant to the accounting and advisory sector in the territories that the MTO will be operating
• Establishing and maintaining standardised configuration baselines and architectural patterns across global tenants by creating and maintaining architecture documentation to provide transparency of design, security posture, and technical dependencies.

Global Collaboration & Stakeholder Engagement

• Partnering with senior technology leaders to define unified operating models, governance frameworks, and platform standards.
• Building strong relationships with US and UK technology teams to drive consistency and shared ways of working.
• Engaging with business leaders to understand operational requirements and ensure the MTO programme delivers measurable productivity and collaboration outcomes.

Risk Management & Governance

• Establishing and maintain enterprise governance frameworks for M365 usage, security, licensing, and data protection across global tenants.
• Proactively identifying risks and interdependencies across territories and propose mitigation strategies.
• Ensuring compliance with ISO standards, applicable regulatory requirements, and internal RSM policies.

What we are looking for:

Are you someone who thrives on variety, loves learning new things, and enjoys connecting with people? If you can spot inefficiencies in everyday life and are passionate about making improvements, this role is perfect for you!

We value diverse experiences and perspectives. Here's what we're looking for in our ideal candidate:

• Extensive experience managing enterprise scale M365 environments in complex, multisite or multi-tenant organisations.
• Proven leadership in directing M365 migrations, tenant consolidations, or major cloud transformation programmes.
• Deep technical knowledge across the full Microsoft 365 ecosystem and related technologies (e.g., Entra ID, Exchange, Purview, Power Platform).
• Strong understanding of identity architecture, zero-trust security principles, and enterprise data governance.
• Experience working with senior stakeholders, steering committees, and cross-organisation governance forums.

What we can offer you:

We recognise that our people are our most important assets. That's why we offer a flexible reward and benefits package that will help you have fulfilling experience, both in and out of work.

• Hybrid and Flexible working
• 27 Days Holiday (with the option of purchasing additional days)
• Lifestyle, Health, and Wellbeing including financial wellbeing benefits such as financial tools, electric car scheme and access to a virtual GP
• Access to a suite of 300+ courses on demand developed by our inhouse Talent Development team

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Diversity and Inclusion at RSM
At RSM, we want to create a strong sense of belonging so that people of all identities, backgrounds, and cultures feel they can bring their true self to work. Our clients come from all walks of life. We aim to achieve that same diversity of background, experience and perspective in our own teams, so that we can genuinely understand our client's needs. Diverse teams bring a broader range of ideas and insights to work. That's why we're working together to ensure our firm's principles and processes support a firm culture that embraces difference and strengthens inclusion.