Senior Systems Administrator - Military veterans preferred

ManTech (


  full-time   employee

United States

Where applicable, confirmation that you meet customer requirements for facility access which may include proof of vaccination and/or attestation and testing, unless an accommodation has been approved.

Secure our Nation, Ignite your Future

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first. At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement.

Currently, ManTech is seeking a motivated, career and customer oriented Senior Systems Administrator to join our team in Chantilly, VA to provide unparalleled support to our customer and to begin an exciting and rewarding career within ManTech.

The Senior Systems Administrator will be the primary SME for specific technical components of the infrastructure, including the Windows Active Directory network, provisioning servers, managing a WSUS solution, an MS Exchange system, backups, security scanning, reporting and remediation. 

The primary functions of the candidate will include, but are not limited to:

  • Provide O&M for the virtualized environments (VMware vCenter 5.5, 6.0/6.7, to include ESXi and distributed switches).
  • Provision hardware, storage, resources and configuration/administration, including high-availability and failover services.
  • Provide configuration management to include authoring technical documentation, process changes, and inventory control. 
  • Perform O&M of Windows applications such as WSUS, Exchange, and audit solutions.
  • Experience with RAIDs, SANs, High Availability, Backups and Disaster Recovery.
  • Experience in security hardening of operating systems in a standalone environment as well as through GPOs.
  • Knowledge in basic networking technologies (switches, routers, VLANs).
  • Research and obtain quotes for hardware/software based on customer requirements.
  • Provide superior customer service; possess strong communication (verbal and written) and interpersonal skills in a dynamic customer centric environment.

Position Requirements:               

  • Must be DoD 8570 IAT Level II compliant (have current CompTIA, Security+ certification)
  • Bachelor’s Degree and 14+ years’ experience in related field or the equivalent of 18 years’ experience.
  • MS Windows Server 2019/2016/2012 (focus on Active Directory, Group Policy)
  • MS Exchange 2016
  • VMware management
  • Storage engineer/administrator (3PAR, NetApp, etc.)
  • SAN switches (Cisco family, Nexus 5k, etc.)
  • Experience with security hardening process as it relates to ICD 503

Security Clearance Requirements:

Must possess current TS/SCI with Polygraph.

Physical Requirements:

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

Must be able to communicate, converse, and exchange information with peers and senior personnel

Must be able to constantly operate a computer and other office productivity machinery, such as a computer


For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

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 because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech's Corporate EEO Department at (703) 218-6000. ManTech is an affirmative action/equal opportunity employer - minorities, females, disabled and protected veterans are urged to apply. ManTech's utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access as a result of your disability. To request an accommodation please click and provide your name and contact information.