**MANTECH** seeks a motivated, career and customer-oriented **Senior** **IT Systems Administrator** to join our team in **Chantilly, VA.** **Responsibilities include but are not limited to:** + Providing end-user support to personnel utilizing ITD IT systems. + Triaging help desk tickets for a broad range of service requests to include file transfers, assistance with desktops and peripheral equipment, account management, and other user-focused incidents. + Installation, accountability, maintenance, and decommission of physical desktop, data center equipment and other IT assets. + Performing general operations & maintenance for COTS/GOTS hardware and software. **Minimum Qualifications:** + Bachelor’s degree in Computer Science, Systems Engineering, or other IT-related discipline and 7+ years of relevant experience in Information Technology. + In lieu of a Bachelor’s: Associates’ degree and 10 years of relevant experience in Information Technology. + Appropriate ND 50-05/DoD 8570.01-M certification. + Experience with Windows and Linux operating systems. + Experience providing help-desk end-user support for common desktop and server issues. + Experience installing and configuring physical equipment. + Ability to provide technical support in the management of networks, software, hardware, configurations and architectures. + Experience and ability to perform software installations and upgrades to operating systems and layered software packages. + Experience with Intelligence Community Directive (ICD) 503 and system Assessment and Authorization (A&A) procedures/processes. **Clearance Requirements:** + Must have a current/active TS/SCI w/Polygraph. **Physical Requirements:** + Must be able to remain in a stationary position 50% + 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. + Must be able to exchange accurate information in these situations. 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.