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.

• 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 9
  
  Windows 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 Service Now 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.

• Bachelor's 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.

• Linux administration (RHEL/CentOS/Ubuntu)
• Windows operating systems (Windows 10, Server 2012/2016)
• Active Directory, DNS, DHCP, DFS, LDAP
• Troubleshooting Microsoft Office applications (Outlook, Excel, Word), Java, and web browsers
• Familiarity with ITSM tools such as Service Now
• Strong verbal and written communication skills
• Understanding of ITIL v3 or higher

• Microsoft SCCM
• Power Shell scripting
• VMware and Citrix virtualization
• VMware User Experience Management (UEM)
• Microsoft Exchange administration
• Video conferencing and VoIP support
• Networking fundamentals

At 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.

Explore an enterprise IT career at GDIT and you'll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.