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

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.

We are seeking a Sr. Linux Systems Administrator (SA).  The Senior SA will part of a 3-4 member staff of senior administrators.  The SA will be responsible for managing a large inventory of Red Hat Linux servers, VMware ESXi blade servers, HP storage, and AWS Cloud technologies.

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

  • Configuring, maintaining, monitoring, diagnosing, and troubleshooting of Linux Operating Systems (RHEL 7/8) with basic knowledge of Windows Operating Systems.
  • Security hardening of Linux in a standalone environment based on DISA STIGs and Tenable Nessus scan results.
  • Install & maintain various Linux applications such as Apache Tomcat, Kerberos, LDAP, Red Hat Satellite, Centrify, Java.
  • Providing O&M for virtualized environments (VMware vCenter 7, to include ESXi and distributed switches).
  • Provisioning hardware, storage, resources and configuration/administration, including high-availability and failover services.
  • Providing configuration management to include authoring technical documentation, process changes, and inventory control. 
  • 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.

Required Qualifications:

  • Must be DoD 8570 IAT Level II compliant (have current CompTIA, Security+ certification)
  • Bachelor’s Degree in related field and 5+ years of experience or 10+ years of experience.
  • Experience managing Yum repos and patching for networked deployments of Linux systems.
  • Proficiency with automation tools and scripting to include bash, Python (experience with other tools such as Salt or Chef is also sufficient).
  • Thorough understanding and workings of Linux services including authentication services, web services, NFS, NTP, SMTP, SSH, DNS, clustering, and logging.
  • Familiarity with virtualized hosting such as VMWare and Cloud Providers (Azure or AWS).
  • Experience implementing and maintaining systems governed under Risk Management Framework (RMF) and NIST 800-53 implementations in secure environments.

Preferred Qualifications:

  • Cloud computing (AWS preferred) with an emphasis on storage (S3) and EC2 system provisioning
  • MS Windows Server 2019/2016/2012 (focus on Active Directory, Group Policy) 
  • Storage engineer/administrator (3PAR, NetApp, etc.)
  • Knowledge of network switches and routing protocols
  • Experience with Windows applications such as WSUS, Exchange, SharePoint, SCCM, and audit solutions.
  • Experience with RAIDs, SANs, High Availability, Backups and Disaster Recovery.

Security Clearance:

Must possess current TS/SCI with CI 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.

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.

Similar jobs