Microsoft System Administrator - Senior - #881

MANTECH seeks a motivated, career and customer-oriented WINDOWS SERVER ADMINISTRATOR to join our team in QUANTICO, VA. Responsibilities include but are not limited to: Installing, configuring, and maintaining Windows Server operating systems (2016, 2019, 2022) while monitoring server performance and optimizing resource utilization.Managing Microsoft Active Directory Domain Services (AD DS), including domain controllers, user/group management, DNS, DHCP, and complex Group Policy Object (GPO) crea

The System Administrator Junior supports the daily administration, maintenance, security, and availability of mission-critical IT infrastructure in a highly regulated government environment, with a focus on user account management and core server operations. This role performs routine configuration, patching, monitoring, backup verification, and troubleshooting under established procedures while maintaining accurate system documentation and contributing to after-hours support as required. The a

Windows Systems Administrator Location: Suitland, MD Security Clearance: Active TS/SCI Required Leidos is seeking a Windows Systems Administrator to support mission critical infrastructure in Suitland, MD. In this role, you will administer and maintain Windows server environments supporting enterprise infrastructure, standardized desktop services, and secure mission operations. The ideal candidate has extensive experience managing Microsoft technologies, troubleshooting complex systems, and m

Job ID: 2613807 Location: Washington, DC, US Date Posted: 2026-06-17 Category: Information Technology Subcategory: IT Systems Engineer Schedule: Full-Time Shift: Day Job Travel: No Minimum Clearance Required: None Clearance Level Must Be Able to Obtain: Public Trust Potential for Remote Work: ORA_ON_SITE Description The Senior Server Windows Engineer will provide systems administration and migration support for over 2000 windows operating on-premises and cloud tenants/environments with