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Tier 2 Linux Administrator - TS/SCI with polygraph

Company: General Dynamics IT
Location: Fort Belvoir, VA
Employment Type: Full Time
Date Posted: 07/29/2026
Job Categories: Engineering, Information Technology

Job Description

Tier 2 Linux Administrator - TS/SCI with polygraph
General Dynamics Information Technology (GDIT) is seeking a highly skilled IT Engineer with strong experience in Linux system administration and strong competency in Microsoft Enterprise Systems to provide Tier 2 support for a large Federal Intelligence Agency. This role is part of a high-performing team that supports mission-critical infrastructure across multiple security enclaves and hybrid environments, with a primary focus on RHEL-based systems and secure Linux operations. As a Tier 2 engineer, you will be responsible for advanced troubleshooting, system optimization and user support for Linux platforms while also supporting Windows systems as needed to ensure optimal performance and operational continuity. Key Responsibilities:Provide Tier 2 support for incident resolution and user issues in a mixed Windows/Linux enterprise environment.Perform Linux system administration (RHEL, CentOS, Ubuntu), including user management, permissions, and basic performance diagnostics.Support Windows workstations and servers 9Windows 10, Server 2012/2016) as required, including Active Directory, Group Policy, DNS, DHCP and DFS.Troubleshoot application crashes, system performance issues, and connectivity problems.Deliver remote and on-site end-user desktop support, resolving escalated technical issues effectively and efficiently.Respond to service desk escalations using tools like ServiceNow or NETS; provide documentation and incident reporting.Collaborate with external teams to analyze and improve end-user experience.Participate in incident triage and real-time response efforts.Engage in special projects and contribute to long-term solutions for recurring system issues.Maintain compliance with DoD security standards, including DoD 8570 IA certification requirements. Basic Qualifications:Bachelors degree in Computer Science, Information Systems, or related field (or equivalent work/military experience).Minimum 5+ years of experience in systems administration, with demonstrated Tier 2 support capabilities.Active TS/SCI with Polygraph clearance.Current DoD 8570 IAT Level II Certification (e.g., CompTIA Security+ CE, SSCP, or CCNA-Security). Security+ CE preferred.Must obtain the appropriate Computing Environment (CE) training within six (6) months of hire. Required Technical Skills & Knowledge:Linux administration (RHEL/CentOS/Ubuntu)Windows operating systems (Windows 10, Server 2012/2016)Active Directory, DNS, DHCP, DFS, LDAPTroubleshooting Microsoft Office applications (Outlook, Excel, Word), Java, and web browsersFamiliarity with ITSM tools such as ServiceNowStrong verbal and written communication skillsUnderstanding of ITIL v3 or higher Preferred/Bonus Skills:Microsoft SCCMPowerShell scriptingVMware and Citrix virtualizationVMware User Experience Management (UEM)Microsoft Exchange administrationVideo conferencing and VoIP supportNetworking fundamentalsGDIT 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 youll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.