Windows System Administrator

ManTech International seeks a Windows System Administrator to support mission-critical federal and national security programs. You will install, configure, and maintain Windows servers and workstations in secure enterprise environments, manage Active Directory, Group Policy, and DNS, and perform patching, backups, and performance tuning. Responsibilities include monitoring system health, troubleshooting complex issues, automating routine tasks with PowerShell, and supporting cybersecurity hardening and compliance. You'll collaborate with engineers and security teams, document configurations, and contribute to continuous improvement while leveraging robust training and growth opportunities.