Senior Linux Systems Admin - TS/SCI w/Polygraph

Clearance Level
Top Secret SCI + Polygraph
Systems Administration
Chantilly, Virginia
Onsite Workplace
Key Skills For Success

Information Technology (IT)


Operating Systems (OS)

REQ#: RQ163795
Requisition Type: Regular
Your Impact

Own your opportunity to serve as a critical component of our nation’s safety and security. Make an impact by using your expertise to protect our country from threats.

Job Description

Transform technology into opportunity as a Senior Linux Systems Admin  with GDIT. A career in enterprise IT means connecting and enhancing the systems that matter most. At GDIT you’ll be at the forefront of innovation and play a meaningful part in improving how agencies operate.

At GDIT, people are our differentiator. As a Senior Linux Systems Administrator you will help ensure today is safe and tomorrow is smarter. Our work depends on Senior Linux Systems Adminjoining our team to apply expertise in the installation, configuration, operations, and maintenance of both Windows- and Linux-based architectures. The linux systems administrator will focus on improving the stability and performance of the platform, maintaining and improving the security posture of the domain, continuous monitoring of system health, and troubleshooting issues that arise. This individual is accountable for Windows, Linux, and application systems that support the infrastructure. Responsibilities on these systems include SA engineering, operations and maintenance, and research and development to ensure continual operation.  

The position requires deep technical knowledge of systems, networks, and application security as well as a solid understanding of enterprise-level security frameworks, policies, processes, and standards. The candidate must have strong analytical skills for troubleshooting complex issues, attention to detail, and the ability to multitask in a fast-paced environment. Key duties include maintaining operating systems, application support, integration, design, and assistance with additional duties as needed to support the team. 


  • Manages the functionality and efficiency of a group of computers running on one or more operating systems

  • Provide daily operational support for Linux and Microsoft Windows operating systems and applications 

  • Maintain the current virtual machine infrastructure, provide support to the remote users, and complete tasking to create new VM's 

  • Maintain the integrity and security of systems by monitoring security feeds and building, configuring SPLUNK dashboards in support of Continuous Monitoring activities 

  • Develop and maintain standards and procedures for applications across a complex computing infrastructure 

  • Develop and maintain comprehensive documentation 

  • Monitor application and operating system performance and analyze and document problems 

  • Develop and oversee implementation of testing strategies and document the results 

  • Leverage scripting and system automation tools 

  • Maintain current knowledge of relevant technologies  

  • Research and recommend hardware and software, coordinate installation, and provide backup recovery 

  • Interact with users and evaluate vendor products 

  • Review problems to understand the root causes of issues and ensure implementation of proper fixes  

  • Collaborate with system administrators, engineers, and the client to ensure proper integration of applications


  • The position requires an active Top Secret/SCI with Polygraph clearance

  • Bachelor's Degree in Computer Science, Information Technology, or other related technical discipline, or the equivalent combination of education, technical certifications, training, and work experience. 

  • Minimum five (5) years of related experience

  • Certified Linux System Administrator  

  • Extensive experience with Redhat and/or Centos  

  • Demonstrated experience with VMWare ESXi infrastructure 6.x + vCenter server, host clustering with HA, DRS, replication  

  • Upgrading VMWare infrastructure 

  • Demonstrated experience in server builds using automated mechanism 

  • Demonstrated experience with Ansible playbooks for virtual and physical instance provisioning, configuration management and patching and software development 

  • Demonstrated experience with Atlassian Jira and SolarWinds 

  • Demonstrated experience collaborating with other systems administrators, storage administrators, application developers, and network engineers to solve complex problems 

  • Demonstrated experience with Rapid7 Scanning or other scanning tools 

  • Demonstrated experience with Microsoft Window Server versions 2008, 2012, 2016, and 2019 

  • Demonstrated experience with SCCM, WDS, MS SQL server, Exchange, Powershell, batch scripting 

  • Demonstrated experience with SCOM and MIM 

  • Demonstrated experience working with syslog applications such as Splunk 

  • ITIL Foundations Certification a plus 

  • Certifications relating to IT Security (CISSP, GIAC, Security+) a plus 

  • The position is on customer Site


  • 401K with company match

  • Comprehensive health and wellness packages

  • Internal mobility team dedicated to helping you own your career

  • Professional growth opportunities including paid education and certifications

  • Cutting-edge technology you can learn from

  • Rest and recharge with paid vacation and holidays








Work Requirements
Years of Experience

5 + years of related experience

* may vary based on technical training, certification(s), or degree


Linux Foundation Certified System Administrator (LFCS) - Linux Foundation

Travel Required

Less than 10%


U.S. Citizenship Required

About Our Work

We are GDIT. A global technology and professional services company that delivers consulting, technology and mission services to every major agency across the U.S. government, defense and intelligence community. Our 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 30 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.

GDIT is an Equal Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status, or any other protected class.