Chantilly, Virginia

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

Systems Administrator, Principal

ManTech is seeking a motivated, mission oriented Principal Systems Administrator in the Chantilly, VA area.  As a Principal Systems Administrator on our ICON team, you will be responsible for working as part of a small focused technical team to test, maintain, implement and deliver our solution. Duties include document, implement, troubleshoot, maintain, and test our PL-3 reference architecture consisting of Windows Server, Red Hat Linux, Virtual Servers and Desktop Infrastructure, and core applications and services based on those platforms. Key technology areas include VMware vCenter infrastructure, Windows Server 2019, Active Directory, Group Policies, Public Key Infrastructure, Microsoft SQL Server, Microsoft Internet Information Server, WSUS, PowerShell, Splunk, Tanium, and McAfee Security Solutions.  The ideal candidate will also possess experience with system verification and testing; patch management; issue and problem management; RMF/JSIG assessment and authorization.

The Systems Administrator, Principal will:

  • Conduct monthly patching on the multiple environments that make up the PL-3 reference architecture
  • Perform system operability verification tests.
  • As part of the team help maintain documentation to include system configuration, knowledge base, operation guides and standard operating procedures.
  • Interact with and help the PL-3 reference architecture customers with the implementation of the reference architecture.
  • Participate in preparing the PL-3 reference architecture for assessment and authorization (A&A).
  • Participate in technical exchange meetings (TEMs) with other technical professionals.
  • Assist the Systems Engineers with conducting research and troubleshooting.
  • Develop and document systems administration standard operating procedures.
  • Install, configure, troubleshoot, and maintain servers, workstations, and peripherals (virtual and physical)
  • Collaborate with team members to maintain consistency in design and implementation, as well as ensuring environment stability and providing notification of issues/concerns
  • Create and modify scripts to automate tasks
  • Work under general direction, with limited supervision

Positions Requirements:

  • Requires Bachelor's degree and 7-9 years of related experience.
  • Extensive experience with MS Office, Excel, Word, Visio, and PowerPoint.
  • Experience with scripting languages such as PowerShell.
  • Experience with configuring and troubleshooting Active Directory Group Policy.
  • Knowledge of DISA Security Technical Implementation Guide (STIG) and Assured Compliance Assessment Solution (ACAS)
  • Knowledge of Dynamic Host Configuration Protocol (DHCP), and Domain Name System (DNS).
  • Strong organizational, written, and oral communication skills
  • Ability to explain moderately complex ideas or information clearly
  • Must possess analytical and critical thinking skills
  • Skilled in identifying and solving problems by gathering and applying information from a variety of materials or sources
  • Must possess the ability to listen and receive feedback, and consistently share information with the team
    • Proven ability to multi-task and prioritize responsibilities
    • Excellent attention to details and diligent adherence to deadlines and deliverables
    • Must possess DoD 8570 IAT-II certification
    • Experience with Agile Scrum Methodology

Physical Requirements:

Operate computer equipment. Ability to stand and/or sit 50%. Must be able to detect, identify, recognize, observe, assess, and handle stress and work well under pressure.

Security Requirements: 

Must possess an active TS/SCI clearance with ability to obtain a Counterintelligence (CI) Polygraph.


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.

Chantilly, Virginia

ManTech was founded in 1968 to provide advanced technological services to the United States government. We began with a single contract with the U.S. Navy to develop war-gaming models for the submarine community. Over the years, our government's technology needs have increased dramatically in scope and sophistication, and we have grown to meet that challenge.


For more than 4 decades, we kept a careful eye on where emerging technologies were taking the government, and we developed the resources to master those technologies—by staying close to our customers and anticipating their needs, hiring talented professionals to propel us into the future, and acquiring companies with proven capabilities.


Today, we are a multi-billion-dollar public company that provides the innovation, adaptability, and critical thinking our government needs for success in defense, intelligence, law enforcement, science, administration, health, and other fields—throughout the nation and in many countries throughout the world. We are now applying the lessons learned in the unforgiving arena of national security to help the private sector protect networks and critical information.

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