Principal Systems Administrator role managing enterprise Windows Server and Linux environments, including Active Directory, virtualization (VMware/Horizon), cloud identity (Azure AD), and endpoint security. Requires 7+ years of systems administration experience, CompTIA Security+ certification or DoD 8570 IAT Level II equivalent, and ability to obtain a US Secret clearance.… The role combines hands-on administration with mentorship, technical documentation, and Tier 1–2 escalation support, including automation via PowerShell, Bash, or Python.