Sr. System Administrator

GES is seeking a Senior Systems Administrator to lead enterprise-level system administration activities in support of mission-critical Pentagon operations. This role requires deep technical expertise, strong leadership, and the ability to maintain secure, compliant, and highly available systems in a high-visibility environment., Perform advanced system administration, diagnostics, and troubleshooting across enterprise systems

Lead patching, upgrades, and compliance initiatives to maintain system integrity

Manage and maintain Active Directory, DNS, DHCP, and virtualization platforms

Ensure STIG compliance and maintain a strong cybersecurity posture

Support system implementations, modernization efforts, and infrastructure improvements

Provide technical leadership, mentoring, and guidance to junior administrators

Bachelor's degree in Information Technology or related field

5+ years of progressive system administration experience

DoD 8140/8570 IAT Level II certification (Security+, CCNA Security, GSEC, SSCP, etc.)

Strong experience with enterprise systems, virtualization, and Windows Server technologies