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 authentication models, access control, lifecycle management, and hybrid integration • Define and own mobile access architecture for iOS and Android • Architect the Azure foundations that support Microsoft 365, identity, automation, monitoring, and remediation • Treat observability as non-negotiable — design deep monitoring, alerting, and telemetry, using tooling that surfaces systemic risk and informs decisions • Own BAU operations for the platform, including incidents, degradations, change execution, and continuous improvement • Design, implement, and operate self-healing automation that closes the loop between detection, remediation, and prevention • Build and maintain production-grade automation using industry-standard tooling, including AI-assisted development where it accelerates delivery without reducing ownership What you'll get You'll join a culture of collaboration and excellence, surrounded by curious thinkers and creative problem-solvers. Motivated by a passion for continuous improvement, you'll thrive in a supportive, high-performing environment alongside talented colleagues, collectively tackling some of th