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, 2026For 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.
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.
Skills Required
- TS/SCI with Polygraph clearance at the time of application
- Ten 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 additional years of System Administration experience may substitute for the bachelor's degree
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
