Are you ready to support one of the Department of War's (DoW) most critical high-performance computing environments?
Leidos is seeking an experienced Senior Linux Systems Administrator to support our customer at Stennis Space Center, MS, home to one of the DoW's largest supercomputing centers. In this role, you'll be providing your Linux Systems Administration expertise to help ensure DoW scientists have reliable access to critical resources.
This is an opportunity to work on cutting-edge technologies in a mission-driven environment while leading a team of talented Linux professionals.
Work Location: Hybrid work schedule available. Candidates must reside within commuting distance of Stennis Space Center, MS, and be available to work on-site 3 days/week.
Clearance: U.S. citizenship with an active Secret clearance is preferred, however an Interim Secret clearance is required prior to start.
Primary Responsibilities: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.
Required Qualifications:
Bachelor's degree with 8+ years of Linux Systems Administration experience. Additional experience may be considered in lieu of a degree.
Current DoW 8570 IAT Level II certification (Security+ CE or equivalent) prior to start.
One of the following Linux certifications prior to start: Red Hat Certified System Administrator (RHCSA), CompTIA Linux+, or LPIC-1
Active Secret Security Clearance, or the ability to obtain Interim Secret eligibility prior to start (U.S. Citizenship required).
Extensive experience administering Red Hat Enterprise Linux (RHEL) environments.
Experience with Red Hat Satellite administration.
Hands-on experience developing automation using Ansible.
Excellent troubleshooting and problem-solving skills.
Strong written and verbal communication skills with the ability to effectively interact with technical teams, users, and others.
Preferred Qualifications:
Experience supporting High Performance Computing (HPC) or large-scale enterprise environments.
Experience supporting Department of War (DoW) or other federal government customers.
Familiarity with virtualization technologies and enterprise storage solutions.
Experience with scripting (Bash, Python, or similar) to automate system administration tasks.
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:October 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
- Bachelor's degree with 8 or more years of Linux systems administration experience; additional experience may substitute for the degree.
- Current DoW 8570 IAT Level II certification, such as Security+ CE or equivalent, before starting.
- RHCSA, CompTIA Linux+, or LPIC-1 certification before starting.
- Active Secret security clearance or ability to obtain Interim Secret eligibility before starting; U.S. citizenship required.
- Extensive experience administering Red Hat Enterprise Linux environments.
- Experience administering Red Hat Satellite.
- Hands-on experience developing automation with Ansible.
- Excellent troubleshooting and problem-solving skills.
- Strong written and verbal communication skills with technical teams and users.
- Experience supporting high-performance computing or large-scale enterprise environments.
- Experience supporting Department of War or other federal government customers.
- Familiarity with virtualization technologies and enterprise storage solutions.
- Scripting experience with Bash, Python, or similar languages.
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.
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