Microsoft 365 Lead Engineer

2665 – Microsoft 365 Lead Engineer – Aberdeen or London We have an excellent opportunity for a skilled Microsoft 365 (M365) Lead Engineer to join us on a contract basis (minimum of 3 months) in Aberdeen or London. As M365 Lead Engineer you will provide technical direction, design authority, and decision making for a complex tenant to tenant Microsoft 365 migration. The role oversees vendor led activities—approving runbooks and cutover plans, setting success/rollback criteria, assuring quality and compliance—and provides internal technical leadership where required. Acting as the primary internal owner, the Lead coordinates governance, risk and stakeholder engagement to deliver safe, secure migrations across OneDrive, OneNote, SharePoint Online, Microsoft Teams, Exchange, Power Platform (Power Apps/Automate) and Power BI with minimal business disruption. What you’ll do • Act as M365 design authority for the migration: approve architecture patterns, runbooks, acceptance and rollback criteria; arbitrate technical choices across workloads and regions • Decision making & assurance: chair daily migration stand ups and go/no go forums; own defect triage, evidence based acceptance and hyper care exit • Security, identity & compliance alignment: ensure adherence to Entra ID, information protection, DLP/retention and audit obligations; own exceptions and remediations • Operational readiness & handover: ensure documentation, known issues and support playbooks are complete; confirm BAU support model/SLAs prior to exit • Stakeholder leadership: brief steering/design forums and BU leads; set clear user impact narratives and mitigation in comms and training Key Responsibilities • Workload execution & assurance: Lead and assure vendor delivered migrations across OneDrive/OneNote, SharePoint Online, Teams, Exchange, Power Platform and Power BI by confirming readiness, monitoring execution, and validating post migration integrity of data, permissions, configurations and user experience • Planning & governance: approve scope, sequencing, freeze windows and rollback criteria; own the integrated cutover plan and risk posture • Commercial & licensing guardrails: validate partner SoW changes, licensing dependencies (e.g., cross tenant add ons) and cost impacts before execution • Regional compliance: ensure works council/region specific constraints are embedded in design, comms and execution plans • Continuous improvement: capture lessons learned and embed in subsequent waves, standards and runbooks • Acts as a bridge between subject matter experts (SMEs) and non-technical stakeholders, including project management resources, ensuring clear communication and understanding across all parties • Identifies and actively manages both internal and external technical dependencies to minimise risk and ensure successful project delivery • Serves as the key technical stakeholder for all required engagements, representing technical interests both within the project and to external partners, as well as across the business • Proactively identifies resourcing requirements and recommends changes in response to evolving project scope or priorities What to bring Essential • Enterprise scale leadership across OneDrive, OneNote, SharePoint, Exchange, Teams, Power Apps/Automate and Power BI, with authoritative understanding of migration boundaries and remediation patterns • Vendor management with authority: proven track record holding suppliers to milestones, quality gates and acceptance under a formal RACI/SoW • Automation & telemetry: advanced PowerShell/Graph skills for assessment/validation; ability to define dashboards/status reporting that reflect business risk and readiness • Change leadership: leads pilots, hyper care and user readiness at scale with measurable outcomes; excellent communication for executive and end user audiences Preferred • Power Platform/BI governance: environment strategy (DEV/UAT/PROD), DLP design, Dataverse/connector re binding; workspace and gateway strategies • Voice/meeting rooms exposure during tenant transitions and dependencies management • M&A / integration programmes with phased BU rollouts and complex dependency chains • Relevant Microsoft certifications How to Apply We’re committed to creating an inclusive and accessible recruitment process. If you have any access needs or require adjustments at any stage of the application or assessment process, please let us know — we’re happy to support you. Please note: All offers of employment will be subject to background checks and confirmation of the right to work in the UK. 📍 Location: Aberdeen or London (Hybrid working available) 📅 Apply now to be part of a team that values initiative, collaboration, and continuous improvement; talent@prosource.it About us prosource.it is a professional services provider in technology. Established as a traditional provider of managed IT services, prosource.it has evolved with industry and the rapid pace of change within the technology sector. We recognise the importance of people and business process in the successful adoption of technology and change. Our readiness to embrace and apply change comes from our people and we offer a variety of business services across the lifespan of successful technological deployment and adoption. We are a people centred business with a global workforce of 500 plus staff and contractors. Our values are central to what we do and how we do it. We feel they are simple and easy to relate to and we are always looking to welcome new people to the team who share our vision and values. We pride ourselves on being easy to deal with, agile and accepting of change across a wide range of challenging and rewarding roles. We are a team of ‘can do’ and ‘how can I help’ individuals committed to teamwork, partnership, service excellence and delivery. 🌐 www.prosource.it