Senior Microsoft 365 Engineer

Senior Microsoft 365 Engineer Optiver's Global Enterprise Clients team owns the global Microsoft 365 platform — collaboration, messaging, identity, and mobile access — that our entire worldwide workforce runs on every day. It's treated as critical production infrastructure, not a back-office system. You'll join an established, distributed group of senior Microsoft 365 engineers spread across our global offices, operating a single global platform, in a hands-on role with real architectural influence: engineers here design solutions, validate them with peers, and implement them directly. Observability, continuous capability uplift, CI-driven change, and self-healing automation are central to how we keep this platform reliable at scale. What you'll do ·Set direction and design standards for our global Microsoft 365 platform across collaboration, messaging, identity, and device access Lead arcitectural decisions end-to-end — design, peer validation, implementation — driving change from inception through global rollout and adoption, with full ownership of global deliverables Drive systemic simplification, reducing legacy patterns, hybrid complexity, and accidental architecture Define and operate our collaboration and content platforms, including information architecture, governance, permissions, and lifecycle management Own enterprise messaging architecture, including global mail flow, routing, hybrid integration, and coexistence Architect identity and access foundations, covering