**ManTech** seeks a motivated, career and customer-oriented **Systems Administrator** to join our team in **Chantilly, VA** . The position is **onsite** The System Administrator (SA) is an instrumental part of a small, highly technical team providing WAN/LAN systems integration and support of a virtualized Windows client-server medium enterprise in a VMware Virtual Desktop Infrastructure (VDI) environment. The Help Desk supports approximately 1,000 users, and 40 remote sites with zero clients connecting to Windows workstations, multi-function printers, VoIP phones, and Video Teleconference systemsThe team consists of a PM, three System Engineers and four other SAs. **Responsibilities include but are not limited to:** + Tier 1-2 help desk support for user issues reported over the phone or in the ticket system + Monitor system and network performance + Centralized encryption key management + Perform system maintenance **Minimum Qualifications** + 3+ of related system administration experience + 3+ years of experience in the Information Technology field including Windows workstations, Windows servers, Active Directory, and Exchange + 2+ years of experience supporting users and troubleshooting user issues + DoD 8570 IAT level 2 certification: Security+ CE **Preferred Qualifications** + 5 years of experience working with DoD networks, network encryption devices + Crypto key management + Experience with VMware vSphere 7-8 **Clearance Requirements:** + Must be a US Citizen and have an active Top-Secret clearance adjudicated within last 6 years + Ability to obtain TS-SCI security clearance **Physical Requirements:** + Must be able to remain in a stationary position 50%. + Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer. + The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc. ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.