Senior M365 Engineer (12-Month Contract)Location: London, UK (Local SME for PL Re) Duration: 12 Months Work Mode: 4 Days in OfficeRole OverviewWe are seeking a Senior M365 Engineer for a 12-month contract to serve as a Subject Matter Expert (SME) in our London office. You will lead critical migrations, manage local stakeholder governance for our PL Re division, and partner with global engineering on Copilot and new feature adoption.Key Initiatives and ResponsibilitiesMigrations and Projects: Lead Mimecast-to-M365 and home drive-to-OneDrive migrations; manage retention/compliance policy rollouts. Network and Performance: Resolve Teams and network-related issues for London and international offices.Security and Mail Flow: Act as Line 1 security expert (EOP, mail flow rules, routing, encryption) and manage Proofpoint integrations.Architecture and Strategy: Design and implement M365 solutions in a global environment, assist with the enterprise roadmap, and provide expert technical assistance to business units.Compliance: Participate in security reviews and manage e-discovery, legal holds, and archived solutions.Operations: Support core services (Teams, OneDrive, Exchange, SPO), monitor service updates/roadmaps, and handle escalated incidents.Required Experience8+ years: SME-level experience in M365 security, architecture, and design (Exchange Online, SPO, Intune, Azure AD, OneDrive, Teams).5+ years: Exchange Admin in large-scale, 24/7 environments.5+ years: Expertise with Azure A