Linux Systems Administrator

Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret Clearance Level Must Be Able to Obtain: Top Secret/SCI Public Trust/Other Required: None Job Family: IT Infrastructure and Operations Job Qualifications: Skills: IT Troubleshooting, Linux Management, Linux Programming Certifications: None Experience: 3 + years of related experience US Citizenship Required: Yes Job Description: Advance how our customers operate while you advance your career. Join GDIT as a Senior Linux Systems Administrator and build an impactful career in enterprise IT, collaborating with people who are driven and resourceful like you. MEANINGFUL WORK AND PERSONAL IMPACT As a Senior Linux Systems Administrator, the work you’ll do at GDIT will be impactful to the mission of USCENTCOM. You will play a crucial role in configuration, maintenance, and optimization of Linux-based server environments supporting a large-scale enterprise infrastructure. This role supports mission-critical systems across an environment of more than 5,000 users, 1,000 servers, and 10,000 endpoints. The administrator will collaborate closely with other Enterprise Services teams to ensure system availability, performance, security compliance, and operational efficiency in support of USCENTCOM mission requirements. Duties and Responsibilities Configure, deploy, and maintain Linux server environments, including physical and virtual systems. Administer Red Hat and CentOS Linux systems, ensuring stability, performance, and security compliance. Configure and manage Linux services such as Apache, Nginx, DNS, DHCP, LDAP, and related system services. Monitor system performance and availability, proactively identifying and resolving issues before they impact operations. Troubleshoot and resolve complex system issues, including problems without existing documented solutions. Implement system patches, updates, and security hardening in accordance with DoD and organizational policies. Manage SSL/TLS certificate lifecycle activities supporting Linux-based services. Collaborate with infrastructure, network, storage, and security teams to design and implement Linux-based solutions aligned with enterprise requirements. Participate in system upgrades, migrations, and the deployment of new Linux infrastructure components. Ensure incidents, problems, and service requests are tracked, prioritized, escalated, and resolved appropriately. Develop and maintain technical documentation, including system configurations, troubleshooting guides, and standard operating procedures. Produce reports and data sets to inform leadership of system performance, trends, and improvement opportunities. Provide technical mentorship and guidance to junior administrators and team members. Support projects focused on improving the security, efficiency, scalability, and resilience of Linux environments. Assist in developing and enforcing system policies and best practices. Participate in enterprise initiatives to modernize and standardize infrastructure services. Contribute to continuous improvement efforts across Enterprise Services teams. WHAT YOU’LL NEED TO SUCCEED Bring your technology expertise and drive for innovation to GDIT. The Systems Administrator Senior must have: Certification: Applicable DoD 8140 or DoD 8570 Certification (CompTIA Security + CE cert) Experience: 3+ years of related experience Required skills: Demonstrated proficiency administering Red Hat and CentOS Linux systems in enterprise environments. Strong experience building, deploying, and maintaining Linux server infrastructures. Expertise in system performance tuning, availability management, and security hardening. Experience implementing patches, updates, and configuration changes in controlled environments. Ability to troubleshoot and resolve complex systems issues under operational constraints. Strong documentation skills for system configurations, procedures, and troubleshooting guides. Proven ability to work collaboratively across multiple IT disciplines. Desired Skills: Red Hat Certified System Administrator (RHCSA) or higher ITIL 4 Foundation Certification Experience supporting USCENTCOM environments and familiarity with mission systems and operational requirements. Knowledge of enterprise-scale infrastructure operations. Experience mentoring junior administrators and contributing to team development. Security clearance level: TS/SCI US citizenship required 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, competitive pay and paid time off Community: Award-winning culture of innovation and a military-friendly workplace #ARMA #GDITPRIORITY #CENTCOMCITS The likely salary range for this position is $98,472 - $133,228. 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: Less than 10% Telecommuting Options: Onsite Work Location: USA FL MacDill AFB 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 gdit.com/tc. Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans