Senior Systems Administrator

ManTech seeks a motivated, mission-oriented Senior Systems Administrator to join our team in  Chantilly, VA.As the Senior Systems Administrator, you will be responsible for providing a full range of Tier 2/3 IT support services and expertise to customer activities. You will play a key role in the management, optimization, and troubleshooting of our VMware virtualized environment and Active Directory infrastructure, ensuring seamless and reliable operations for the organization.  You will demonstrate knowledge and understanding of client and server operations and maintenance with Windows 10 and 11 environments and Windows Server 2016/2019, to include Active Directory, Domain Controllers, DNS, GPO's, PKI, DHCP, VMware v8, Backup Architectures, Storage Management, and Auditing.  Responsibilities include, but not limited to:Design, implement, and maintain VMware vSphere environments, including vCenter, ESXi hosts, and virtual machines.Troubleshoot and resolve VMware-related issues, including performance bottlenecks, connectivity problems, and resource allocation.Manage, monitor, and troubleshoot Active Directory (AD) and Group Policy infrastructure.Administer and support user and group management, including security and distribution groups within Active Directory.Collaborate with other IT teams to manage system integration, configuration, and upgrades.Create and maintain comprehensive documentation for systems architecture, processes, and configurationsDomestic Travel up to 25%Minimum Qualifications:Bachelor's Degree and 7 years' experience, or high school diploma/GED and 13 years of relevant systems administration experienceExperience in performing maintenance, repair, upgrade, and full life cycle support of hardware/software interfacing with the enterpriseKnowledge of Windows file and folder permission & inheritance structureExperience in researching and ordering hardware/software to meet customer requirementsExperience with client system security to include scans, patching, audit log review, and system health checksProvide leadership and mentoring to junior administrators and technical supportSecurity+ certification (active)Preferred Qualifications:Previous NRO and NRO/COMM experience is highly desiredCOMSEC experience desiredAwareness of new technologies and methods that could improve current environmentFamiliarity with PowerShellExperience with Microsoft ExchangeExperience with LinuxAbility to use MS Office and PCClearance Requirements: Must possess a current / active TS/SCI with PolygraphPhysical Requirements:Must be able to be in a stationary position more than 50% of the timeNeeds to occasionally move about inside the office to access file cabinets, office machinery, etc.Frequently communicates with co-workers, management, and customers, which may involve delivering presentationsFrequently moves Audio/Visual or Computer equipment weighing up to 50 pounds across and/or around a business campus or large facility

Created: 2025-04-24