Senior Systems Administrator

About the role

ManTech is seeking a motivated, mission-oriented Senior Systems Administrator to join our team in Chantilly, VA. You will provide a full range of Tier 2/3 IT support services and expertise to customer activities, coordinate and/or supervise a team of System Administrators, and play a key role in the management, optimization, and troubleshooting of our VMware virtualized environment and Active Directory infrastructure.

Responsibilities

• 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 configurations.
• Domestic travel up to 25%.

Requirements

• Bachelor’s Degree and 4 years’ experience, or high school diploma/GED and 8 years of relevant systems administration experience.
• Experience in performing hardware/software maintenance, repairs, upgrades, full life cycle support, and cybersecurity in an Enterprise IT environment.
• Knowledge of Windows file and folder permission & inheritance structure.
• Intermediate knowledge of networking principles and routing protocols.
• Ability to restore user configurations from backups for continuity of operations.
• Ability to identify and implement new technologies at scale.
• Active Security+ certification.
• Current/active TS/SCI with Polygraph clearance.

Preferred Qualifications

• Previous NRO and NRO/COMM experience.
• COMSEC experience.
• Proficiency with MS Office and PC.
• Familiarity with PowerShell and command line interfaces.
• Knowledge of detecting and correcting technical issues impacting system/server performance.
• Experience with Microsoft Exchange.
• Experience with Linux/RHEL 8.

Physical Requirements

• Must be able to remain in a stationary position more than 50% of the time.
• Occasional movement inside the office to access file cabinets, office machinery, etc.
• Frequent communication with co-workers, management, and customers, including delivering presentations.
• Frequent movement of Audio/Visual or Computer equipment weighing up to 50 pounds across and/or around a business campus or large facility.