2665 – Microsoft 365 Lead Engineer UK 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 regionsDecision making and assurance: chair daily migration stand ups and go/no go forums; own defect triage, evidence based acceptance and hyper care exitSecurity, identity and compliance alignment: ensure adherence to Entra ID, information protection, DLP/retention and audit obligations; own exceptions and remediationsOperational readiness and handover: ensure documentation, known issues and support playbooks are complete; confirm BAU support model/SLAs prior to exitStakeholder leadership: brief steering/design forums and BU leads; set clear user impact narratives and mitigation in comms and trainingKey Responsibilities

Workload execution and 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 experiencePlanning and governance: approve scope, sequencing, freeze windows and rollback criteria; own the integrated cutover plan and risk postureCommercial and licensing guardrails: validate partner SoW changes, licensing dependencies (e.g., cross tenant add ons) and cost impacts before executionRegional compliance: ensure works council/region specific constraints are embedded in design, comms and execution plansContinuous improvement: capture lessons learned and embed in subsequent waves, standards and runbooksActs as a bridge between subject matter experts (SMEs) and non-technical stakeholders, including project management resources, ensuring clear communication and understanding across all partiesIdentifies and actively manages both internal and external technical dependencies to minimise risk and ensure successful project deliveryServes 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 businessProactively identifies resourcing requirements and recommends changes in response to evolving project scope or prioritiesWhat to bring

Enterprise scale leadershipacross OneDrive, OneNote, SharePoint, Exchange, Teams, Power Apps/Automate and Power BI, with authoritative understanding of migration boundaries and remediation patternsVendor management with authority: proven track record holding suppliers to milestones, quality gates and acceptance under a formal RACI/SoWAutomation and telemetry: advanced PowerShell/Graph skills for assessment/validation; ability to define dashboards/status reporting that reflect business risk and readinessChange leadership: leads pilots, hyper care and user readiness at scale with measurable outcomes; excellent communication for executive and end user audiencesPreferredPower Platform/BI governance: environment strategy (DEV/UAT/PROD), DLP design, Dataverse/connector re binding; workspace and gateway strategiesVoice/meeting roomsexposure during tenant transitions and dependencies managementMandA / integration programmeswith phased BU rollouts and complex dependency chainsHow 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.itTalk to us today to explore how we can support your organisation''s technology ..... full job details .....