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Tier 3 System Administrator – TS/SCI with Polygraph

GDIT

Tier 3 System Administrator – TS/SCI with Polygraph

full-timePosted: Aug 26, 2026Updated: Sep 2, 2026USA CO Aurora

Job Description

Type of Requisition:RegularClearance Level Must Currently Possess:Top Secret SCI + PolygraphClearance Level Must Be Able to Obtain:Top Secret SCI + PolygraphPublic Trust/Other Required:NoneJob Family:IT Infrastructure and OperationsJob Qualifications:Skills:Linux, Microsoft Windows, System AdministrationCertifications:NoneExperience:5 + years of related experienceUS Citizenship Required:YesJob Description:General Dynamics Information Technology (GDIT) is seeking a Linux/Microsoft Systems Administrator to join our team in support of a Federal Intelligence Agency contract. In addition to receiving a competitive salary and generous health and personal benefits, the Systems Administrator will enhance their skill set among a talented and technically accomplished group of colleagues.Primary responsibilities include providing Tier II support of maintaining multiple large Enterprise environment. The supporting infrastructure includes multiple Microsoft based networks spanning multiple security enclaves within a hybrid (Windows & RHEL) environment.Job Responsibilities & Duties:System Administrative Advisory duties to include management of Windows and Linux workstations on EVDI and physicalTroubleshooting application functionality, crash and performanceInvestigate user performance and work with external teams to improve user experience.Assist customers with Tier 2 incident resolution for Linux and windows applications.Provide remote end user desktop support.Identifies, analyzes, and resolves system incidents with both short-term workarounds and long-term solutions. Responds to escalated service desk/team requests.Communicate effectively (in oral and written form) with a variety of individuals; work well within small and large team environments.Willingness to provide initial triage, response, and notifications for incidents.Participates in special projects as required.Bachelor's Degree in Computer Science, Engineering or a related technical discipline, or the equivalent combination of education, technical training, or work/military experience.5+ years of related systems administration experienceTS/SCI with Polygraph is required.Candidate must possess an appropriate and current DoD Information Assurance (IA) Certification to be considered for employment; either valid CompTIA Security+ CE, Systems Security Certified Practitioner (SSCP) or Cisco Certified Network Associate (CCNA)-Security. CompTIA Security+ CE Certification is the preferred certification. In addition, candidate must attain the required DoD 8570 Computing Environment (CE) Training within six (6) months of Hire Date.Successful candidates are expected to have related experience and knowledge/understanding of:Active Directory AdministrationDNS, DHCP, DFS, LDAPWindows 10, Server 2012, Server 2016,Application Troubleshooting such as Outlook, Excel, Word, JAVA, Internet ExplorerLinux Operating systemUnderstanding of ServiceNow, NETS or other ticketing processITIL v3 or higherThe following knowledge/skill set is not required but is a plus:Microsoft System Center Configuration ManagerPowerShellVirtualization Environments (VMware, Citrix)Profile management utilizing the VMware User Experience Management (UEM) toolsetMicrosoft ExchangeTelephone/Video supportNetworkingFamiliarity with site specific customer and missionGDIT IS YOUR PLACEAt GDIT, the mission is our purpose, and our people are at the center of everything we do.Growth: AI-powered career tool that identifies career steps and learning opportunitiesSupport: An internal mobility team focused on helping you achieve your career goalsRewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time offCommunity: Award-winning culture of innovation and a military-friendly workplaceOWN YOUR OPPORTUNITYExplore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.The likely salary range for this position is $110,500 - $149,500. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.Scheduled Weekly Hours:40Travel Required:NoneTelecommuting Options:OnsiteWork Location:USA CO AuroraAdditional Work Locations:Total Rewards at GDIT:Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most. Our Identity Verification Process:As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes. About Our Work:We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission-ready capabilities in AI, cloud, cyber and software development.Join our Talent Community to stay up to date on our career opportunities and events atgdit.com/tc.Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

Locations

  • USA CO Aurora

Salary

110,500 - 149,500 USD / yearly

Responsibilities

  • System Administrative Advisory duties to include management of Windows and Linux workstations on EVDI and physical
  • Troubleshooting application functionality, crash and performance
  • Investigate user performance and work with external teams to improve user experience.
  • Assist customers with Tier 2 incident resolution for Linux and windows applications.
  • Provide remote end user desktop support.
  • Identifies, analyzes, and resolves system incidents with both short-term workarounds and long-term solutions. Responds to escalated service desk/team requests.
  • Communicate effectively (in oral and written form) with a variety of individuals; work well within small and large team environments.
  • Willingness to provide initial triage, response, and notifications for incidents.
  • Participates in special projects as required.
  • Bachelor's Degree in Computer Science, Engineering or a related technical discipline, or the equivalent combination of education, technical training, or work/military experience.
  • 5+ years of related systems administration experience
  • TS/SCI with Polygraph is required.
  • Candidate must possess an appropriate and current DoD Information Assurance (IA) Certification to be considered for employment; either valid CompTIA Security+ CE, Systems Security Certified Practitioner (SSCP) or Cisco Certified Network Associate (CCNA)-Security. CompTIA Security+ CE Certification is the preferred certification. In addition, candidate must attain the required DoD 8570 Computing Environment (CE) Training within six (6) months of Hire Date.
  • Successful candidates are expected to have related experience and knowledge/understanding of:
  • Active Directory Administration
  • DNS, DHCP, DFS, LDAP
  • Windows 10, Server 2012, Server 2016,
  • Application Troubleshooting such as Outlook, Excel, Word, JAVA, Internet Explorer
  • Linux Operating system
  • Understanding of ServiceNow, NETS or other ticketing process
  • ITIL v3 or higher
  • The following knowledge/skill set is not required but is a plus:
  • Microsoft System Center Configuration Manager
  • PowerShell
  • Virtualization Environments (VMware, Citrix)
  • Profile management utilizing the VMware User Experience Management (UEM) toolset
  • Microsoft Exchange
  • Telephone/Video support
  • Networking
  • Familiarity with site specific customer and mission
  • GDIT IS YOUR PLACEAt GDIT, the mission is our purpose, and our people are at the center of everything we do.
  • Growth: AI-powered career tool that identifies career steps and learning opportunities
  • Support: An internal mobility team focused on helping you achieve your career goals
  • Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
  • Community: Award-winning culture of innovation and a military-friendly workplace
  • OWN YOUR OPPORTUNITYExplore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

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