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 enclave sand 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

GDIT IS YOUR PLACE
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

OWN YOUR OPPORTUNITY
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.