Administers enterprise Windows domains, Horizon View VDI, and Nutanix HCI environments. Manages Active Directory, DNS, GPOs, DHCP, server and desktop hardening, gold images, patching, and profile management. Supports DoD compliance through STIGs and RMF, performs PowerShell automation, and maintains 24x7 mission environments. Requires extensive Windows, Horizon View, and Nutanix experience plus U.S. citizenship and Secret clearance with Top Secret/SCI eligibility.