• Type: Direct Hire
  • Job #2385

Title: Linux System Administrator
Location: Oakton, VA
*Clearance* : Secret Clearance required

Company Overview: 
Cornerstone Defense, in partnership with our military, intelligence, and civil government customers, supports U.S. operations worldwide through the use of many different types of intelligence, satellite, and cyber technologies.  Cornerstone’s Intelligence Sector provides solutions to the United States Government for information collection, operations, exploitation and dissemination, and research activities. Our Team specializes in software development, cloud architecture, systems and network engineering, systems integration, agile management, as well as targeting operations and intelligence analysis. Our support to our mission customers includes cyber network operations, exploitation and defense, signals intelligence, human intelligence, and critical missions and networks. 

Basic Qualifications:

Bachelor of Science in a STEM (Science, Technology, Engineering, Mathematics) related field, plus a minimum of 5 years of relevant experience; or Master's degree plus a minimum of 3 years of relevant experience. Agile experience preferred.
Department of Defense Secret security clearance is required at time of hire. Applicants selected will be subject to a Government background investigation and must meet eligibility and suitability requirements. Due to the nature of work performed within our facilities, U.S. citizenship is required.

All contract work must be performed within our GDMS facility located in Oakton, Virginia.

  • Our Employee Referral Program offers a $8k Referral Bonus for any candidate referred by an employee and hired for this position.
  • Schedule and hours are flexible within a two week work period although work is performed on-site.
  • A Relocation package may be available for this position.

General Dynamics Mission Systems has an immediate opening for a Linux System Administrator.  This position provides an opportunity to further advance the cutting-edge technology that supports some of our nation’s core defense/intelligence services and systems.  General Dynamics Mission Systems employees work closely with esteemed customers to develop solutions that allow them to carry out high-stakes national security missions.
What you bring to the table:

  • Experience with installation, configuration, and management of Linux systems (Red Hat experience preferred)
  • Experience with scripting languages such as Bash
  • Experience with implementing security requirements

Ideally, you will also have experience with:

  • Storage Area Networks
  • Clustered File Systems
  • Ansible for configuration management and application deployment
  • Monitoring and alerting packages (e.g., Nagios, Grafana, and Prometheus)
  • TCP/IP, Internet Routing Protocols, private and public networks, VLANs, Firewalls, Load Balancers, addressing schemes, subnet creation and subnet masking
  • STIGs (Security Technical Implementation Guides)
  • RMF (Risk Management Framework)

What sets you apart:

  • Ability to grasp and apply new information quickly and handle increasing responsibilities with growing complexity
  • Ability to interact effectively with project teams, managers, and end users
  • Creative and innovative thinking with the ability to multi-task
  • Commitment to ongoing professional development


  • Responsible for managing the functionality and efficiency of a group of computers running on one or more operating systems
  • Maintains the integrity and security of servers and systems
  • Serves as a front-line interface to users with technical issues
  • Makes recommendations for hardware and software purchases
  • Interacts with third-party technology vendors and internal database staff
  • Conducts systems analysis and development to keep systems current with changing technologies
  • Duties may include installing new software, troubleshooting, granting permissions to applications and training users
  • Performs Server administration for Server Operating Systems
  • Performs administration of physical and virtualized servers
  • Responsible for the configuration, maintenance and troubleshooting of physical and virtual hardware
  • Configures, maintains and troubleshoots network related interfaces on servers
  • Performs OS and vendor software patching on servers

Monitors Physical and Virtual Servers performance using monitoring tools


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