Senior System Administrator

Description About Leidos Leidos is a FORTUNE 500 company bringing a mix of innovative technology and sector expertise to customers in the national security, engineering, and health industries. We deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. Guided by our Mission, Vision, and Values, Leidos empowers its teams, contributes to its communities, and operates sustainably-always with a commitment to doing the right thing for our customers, our people, and our community. The Leidos Intel Sector combines technology-enabled services and mission software capabilities in the areas of cyber, logistics, security operations, and decision analytics to support Intelligence Community customers as they address evolving national security challenges. About the Opportunity Leidos is seeking an experienced Senior System Administrator to support the implementation, operation, troubleshooting, and maintenance of IT systems and infrastructure. You will manage day-to-day system operations across client/server, storage, network, mobile, and virtual environments while diagnosing technical problems and supporting reliable system performance. You will administer UNIX, Linux, Windows, and virtual operating environments; support escalated technical issues; configure network components; implement operating-system enhancements; and provide detailed technical analysis to agency management and internal customers. Why This Role Matters Reliable IT infrastructure requires experienced administrators who can move beyond routine operations to diagnose complex problems, support escalated issues, maintain system integrity, and improve performance. As a Senior System Administrator, you will help ensure critical IT systems remain available, reliable, secure, and responsive to operational needs. What You'll Do Systems & Infrastructure Administration Manage daily configuration and operation of IT systems. Support implementation, troubleshooting, and maintenance of IT systems and associated infrastructure. Monitor and support day-to-day operations across client/server, storage, network, mobile, and related devices. Configure and manage UNIX, Linux, Windows, virtual, and other applicable operating-system environments. Install and load operating-system software, troubleshoot system issues, and maintain system integrity. Configure network components and implement operating-system enhancements to improve reliability and performance. Optimize system operations and resource utilization and perform system-capacity analysis and planning. Support security and STE/STN compliance of system software and hardware as required. Advanced Troubleshooting & User Support Provide in-depth troubleshooting of IT systems. Assist users in accessing and using IT systems. Provide Tier 1 Help Desk and Tier 2 escalation support for problem identification, diagnosis, and resolution. Support dispatch-system and hardware problems and remain engaged through resolution. Provide detailed analysis and feedback to agency management and internal customers for escalated tickets. Communicate system status, technical issues, and resolution progress to agency management and internal customers. This posting is for multiple opportunities Required Qualifications Clearance TS/SCI with Polygraph at the time of Application, to be considered for the position. Education & Experience Ten (10) years of System Administration experience supporting programs and contracts of similar scope, type, and complexity. Bachelor's degree in a technical discipline from an accredited college or university. Five (5) additional years of System Administration experience may be substituted for the bachelor's degree. 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: August 28, 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 onlyand 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. About 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 $16.7 billion for the fiscal year ended January 3, 2025. 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 at Securing Your Data Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at . If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission. Commitment to Non-Discrimination 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.