Lead Senior Systems Administrator

MANTECH seeks a motivated, mission-oriented Senior Systems Administrator to join our team in Chantilly, VA.

As the Lead Senior Systems Administrator, you will be responsible for providing a full range of Tier 2/3 IT support services and expertise to customer activities, as well as leading, mentoring, and coordinating with a team of System Administrators. 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.

• Lead and supervise a team of system administrators (Windows/Linux/VMWare) and IT support staff.

• 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.

• Domestic Travel up to 25%

• Bachelor’s Degree and 7 years’ experience, or high school diploma/GED and 13 years of relevant systems administration experience with 3 + years in a leadership role

• Experience in performing maintenance, repair, upgrade, and full life cycle support of hardware/software interfacing with the enterprise

• Knowledge of Windows file and folder permission & inheritance structure

• Experience in researching and ordering hardware/software to meet customer requirements

• Experience with client system security to include scans, patching, audit log review, and system health checks

• Experience in creating and maintaining comprehensive documentation for systems architecture, processes, and configurations

• Security+ certification (active)

• Previous NRO experience is highly desired

• Previous NRO/COMM experience is desired

• Strong communication skills due to variety of groups to be working with, such as co-workers, management, and customers.

• ITIL Foundations or later certification highly desired

• Experience using a Service Desk ticketing system, such as Remedy or Service Now

• Must possess a current / active TS/SCI with Polygraph

• Must be able to be in a stationary position more than 50% of the time

• Needs 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 presentations

• Frequently moves Audio/Visual or Computer equipment weighing up to 50 pounds across and/or around a business campus or large facility

MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at  and provide your name and contact information.