Senior Linux Systems Administrator

If you're interested in being a part of an extraordinary mission, working with our customer who runs the DoD’s largest supercomputing centers and operating some of the most powerful supercomputers in the world, we could use your experience and enthusiasm! You will be providing your LINUX Systems Administration expertise to ensure DoD scientists have reliable access to these critical resources. You will be directly supporting the warfighter. All of your work will be performed on customer site at Stennis Space Center and an Interim Secret Clearance is required to begin work on the program. So, what will you be doing in this role? Provide expert-level administration of RedHat Linux systems, ensuring optimal performance and security. Perform systems enhancement, configuration, maintenance, installation, and software upgrades. Lead a team of high-performing Linux administrators, providing guidance, technical expertise, and project leadership. Foster a collaborative and productive team environment, sharing lessons learned and best practices. Maintain and manage the Enterprise Satellite server, ensuring it meets the organization's software deployment and updates needs. Automate routine and complex tasks using Ansible, streamlining operations and improving efficiency. Monitor and tune systems to achieve optimum performance levels, adhering to established policies, procedures, and service level agreements. Identify and address performance issues and optimize the production environment for mission-critical systems. Perform acceptance testing of modules, subsystems, and total systems. Responsible for software installation, configuration, and ensuring adherence to configuration guidelines. Ensure compliance with established standards, policies, and configuration guidelines. Maintain documentation and records to demonstrate adherence to regulatory requirements. These are the required qualifications... Must hold an active in Secret clearance or be able to obtain Interim Secret eligibility prior to start. (US Citizenship required) Must hold a Bachelor's Degree with a minimum of 8 years related experience Must hold current DOD 8570 IAT II certification – Security + and one of the following Linux certifications: Linux + or RedHat Certified System Administrator (RHCSA) prior to start. Communicates effectively both orally and in a written form with users and office staff If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares. Original Posting: June 15, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Pay Range: Pay Range $92,300.00 - $166,850.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law. Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here. Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to View email address on click.appcast.io. Commitment and Diversity All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.