Summary: The Senior Systems Engineer will lead the planning, implementation, administration, and support of enterprise collaboration platforms, endpoint management systems, and virtual desktop infrastructure (VDI) serving over 12,000 geographically distributed endpoints across Windows, macOS, iOS, Android, and other devices. Identity & Directory Services: - Administer on-premises Active Directory and Microsoft Entra ID, including Group Policy, OU structures, hybrid identity, Conditional Access, role-based access control (RBAC), and directory synchronization via Entra Connect, ensuring clean, consistent identity data across on-premises and cloud environments.