Tier 2 Linux Administrator - TS/SCI with polygraph

Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret SCI + Polygraph Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph Public Trust/Other Required: None Job Family: IT Infrastructure and Operations Job Qualifications: Skills: Linux, Microsoft Enterprise Technologies, Red Hat Enterprise Linux (RHEL) Certifications: None Experience: 5 + years of related experience US Citizenship Required: Yes Job Description: 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: 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. Required Technical Skills & Knowledge: 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 ServiceNow Strong verbal and written communication skills Understanding of ITIL v3 or higher Preferred/Bonus Skills: Microsoft SCCM PowerShell 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. 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: 40 Travel Required: None T elecommuting Options: Onsite Work Location: USA VA Fort Belvoir Additional 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 at . Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans