• Location: Chantilly
  • Type: Contract
  • Job #2200

Title: Systems Administrator
Location: Crystal City
Clearance: TS/SCI with Polygraph, obtainable within a reasonable time.


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.

Responsibilities for this Position
Our program provides an opportunity to further advance cutting-edge technology, products, and services for a large Government agency to detect and mitigate insider threats. This program takes data from multiple sources in any format (structured or unstructured), transforms it into interpretable fragments, and allow our engines to categorize, quantify, distill, and display results for human analysts to interpret. Team members work closely with esteemed customers to develop solutions that allow them to carry out high-stakes national security missions. The program technology stack is built on cutting edge hardware and software with multiple Windows and Linux environments interfacing with multi-petabyte data processing and analytic platforms – all designed, built, and maintained by our team. The field of insider threat detection and mitigation is evolving and growing, and our program needs highly innovative individuals.


  • Administer and manage Windows and Linux operating systems for on-premises systems, engineering, analysis, and test environments
  • Perform system and user account maintenance
  • Test and assess security configuration of Windows and Linux servers
  • Monitor, evaluate, and optimize system performance
  • Troubleshoot and resolve operating system conflicts
  • Analyze, test and implement security patches and hardening
  • Perform maintenance data collection on the equipment
  • Perform preventive and corrective maintenance activities
  • Document maintenance actions
  • Installs, configures and maintains multiplatform systems hardware, software and components
  • Integrates security solutions into information systems
  • Will be a team member supporting the day-to-day operations of a production customer Insider Threat analytic network
  • Will work closely with a small team comprised of diverse skill sets
  • Will be responsible for maintaining the health and well being of the current infrastructure
  • Candidates should have strong Tier 1-2 administrative and debugging experience
  • A strong candidate will be comfortable working in a multi-vendor network with a large array of COTS applications
  • Will work closely on Assessment and Authorization (A&A) efforts to ensure the infrastructure meets all requirements
  • Candidates must be self-starters and have the aptitude to work independently in a fast paced continuously evolving environment
  • Identify and develop automated tasks to streamline manual activities
  • Ensure the systems meet security requirements
  • Monitor and remediate system backup issues
  • Monitor SIEM for system incidents
  • Participate in internal / external security audits/inspections, create and maintain Plan of Action and Milestones (POAM) as required
  • Assist team with continuous monitoring, implementation and troubleshooting of required patch compliance for all clients
  • Responsibilities may require periodic evening and weekend work in response to needs of the systems being supported


  • Experience with Windows and Linux system administration including testing building/provision large-scale physical and/or virtual environments
  • Strong verbal and written communication skills
  • Ability to work independently with little supervision
  • Demonstrated ability to quickly learn, retain, and apply good interpersonal skills, and perform effectively under time pressure
  • Experience with desktop support to users
  • Experience troubleshooting hardware related issues.
  • Support hardware installation and startup
  • Experience with troubleshooting and maintaining data center and office equipment
  • Basic network experience
  • Basic understanding of systems engineering concepts, principles, and theories
  • Creative thinker
  • Ability to multi-task
  • Ability to grasp and apply new information quickly and effectively handle complex assignments
  • Shows initiative on assignments, exercises independent judgment and professionally executes projects with little direction
  • Ability to communicate issues, impacts, and corrective actions
  • Agile experience
  • DoD 8570 Compliant
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