Audiovisual, Auditing, Business Continuity Planning (BCP), Command Line, Communications Security (COMSEC), CompTIA Security+, Customer Support/Service, DHCP (Dynamic Host Configuration Protocol), DNS (Domain Name System), Data Analysis, Documentation, Government Intelligence, High School Diploma, Identify Issues, Information Technology & Information Systems, Intelligence Agencies, Internet Security, Linux Operating System, Maintenance Services, Microsoft Active Directory, Microsoft Exchange Server, Microsoft Office, Microsoft Windows Operating System, Microsoft Windows Server, National Reconnaissance Office (NRO), Network Protocols, Office Equipment, People Management, Presentation/Verbal Skills, Public Key Infrastructure (PKI), Red Hat Linux Operating System, Resource Management, Routing Protocols, Sensitive Compartmented Information (SCI), Server Maintenance, Software Administration, Software Development, Storage Architecture, System Architecture, System Integration (SI), Systems Administration/Management, Systems Maintenance, Team Lead/Manager, Technical Support, Top Secret Clearance, VMWare, VMWare ESX/ESXi, VMWare vCenter, VMWare vSphere, Virtual Hosting, Virtual Machine (VM), Willing to Travel, Windows PowerShell
General information
Requisition #
R69045
Locations
USA-VA-Chantilly
Posting Date
07/01/2026
Security Clearance Required
TS/SCI w/ Poly
Remote Type
Onsite
Time Type
Full time
Description & Requirements
Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we've been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now-unleash your potential with MANTECH!
MANTECH seeks a motivated, mission-oriented Senior Systems Administrator to join our team in Chantilly, VA.
As a 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 coordinating and/or supervising 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.
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 configurations
- Domestic Travel up to 25%
Minimum Qualifications:
- 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
- Security+ certification (active)
Preferred Qualifications:
- Previous NRO and NRO/COMM experience is highly desired
- COMSEC experience desired
- Ability to use MS Office and PC
- Familiarity with PowerShell and command line interfaces
- Knowledge of how to detect and correct technical issues impacting system/server performance
- Experience with Microsoft Exchange
- Experience with Linux/RHEL 8
Clearance Requirements:
- Must possess a current / active TS/SCI with Polygraph
Physical Requirements:
- 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 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 careers@mantech.com and provide your name and contact information.
M
ManTech International Corp
Our Mission
Our mission is empowering our nation through a diverse and skilled workforce securely delivering innovative technology, consulting services and digital solutions for our customers’ mission success, every day.
Our Vision
Our vision is Securing the Future as the most trusted partner for U.S. Defense, Intelligence and Federal Civilian customers through the power of One ManTech. When these agencies think of an essential partner for their national and homeland security needs, they think ManTech.
Our Values
Our values are grounded in a bedrock of truth, integrity and caring for each other and the mission. We hold steadfast to:
• TRUST – We earn and protect the trust of our customers, employees and investors through an enduring foundation of respect, fairness, credibility and honoring our commitments, always.
• INCLUSION – We are an inclusive, diverse and talented workforce with a passion for mission success, intellectual capital, creativity and integrity. Our high ethical standards and investment in our people build confidence with our customers.
• QUALITY– We deliver exceptional quality to customers through differentiated technology solutions and an uncompromising focus on excellence, value and innovation.
5,000 to 9,999 employees
https://www.mantech.com/about