Principal Linux Systems Administator

Leidos LLC; Aurora (CO); On-site; USD 131,000 - 237,000; Full time

Benefits offered by this job

Sign-on bonus

Paid time off

11 paid holidays

401K with company match

Job summary

Leidos LLC seeks a Principal Linux Systems Administrator to lead IT infrastructure support across UNIX/Linux and Windows environments. You will ensure security, compliance, and performance for client/server/storage/network systems within the Intelligence Sector.

A 10k sign-on bonus is available and a robust benefits package accompanies the role. Responsibilities include system configuration, access control, and daily IT support while ensuring STE/STN compliance and capacity planning.

Qualifications

• 15+ years of experience as a System Administrator on programs/contracts of similar scope.
• Bachelor’s degree may substitute for 5 years of experience to reach 20 years total.
• Experience with UNIX/Linux, Windows, and virtualization.

Responsibilities

• Maintain STE/STN compliance to meet security and regulatory standards.
• Manage accounts, network rights, and access; enforce security procedures and tooling.
• Configure and manage UNIX and Windows OS, install software, troubleshoot, and optimize system performance.

Skills

Linux

Windows

Virtualization

TS/SCI Clearance with Polygraph

Education

Bachelor’s degree in a technical discipline

Job description

Leidos has a new and exciting opportunity for a Principal Linux Systems Administrator in our Intelligence Sector, Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security! Join our team as a Linux Systems Administrator, where you'll provide crucial support for the implementation, troubleshooting, and maintenance of Information Technology (IT) systems.

You’ll manage IT system infrastructure and processes, ensuring the smooth operation of client/server/storage/network devices, mobile devices, and more. Your role will involve configuring and managing UNIX and Windows operating systems, troubleshooting, maintaining network integrity, and enhancing system performance. This position is eligible for a 10k Sign on Bonus!

Primary Responsibilities

• Maintain STE/STN Compliance: Ensure systems meet security and compliance standards.
• Account and Access Management: Manage accounts, network rights, and access to systems and equipment, implementing security procedures and tools.
• System Configuration and Management: Configure and manage UNIX and Windows operating systems, install/load software, troubleshoot, maintain network integrity, and implement system enhancements.
• IT Support and Troubleshooting: Provide day-to-day IT support, monitoring, and problem resolution for client/server/storage/network devices and mobile devices.
• User Assistance: Assist users in accessing and using IT systems, providing support for escalated tickets and detailed analysis.
• System Optimization and Capacity Planning: Optimize system operations and resource utilization, perform system capacity analysis and planning.
• Dispatch System and Hardware Support: Support dispatch systems and hardware issues, configure and install system hardware/software, and maintain server and domain security requirements.

Basic Qualifications

• Experience: Fifteen (15) or more years of experience as a System Administrator (SA) supporting programs and contracts of similar scope, type, and complexity. Five (5) years of additional SA experience may be substituted for a bachelor’s degree bringing the required experience to 20 years.
• Education: Bachelor’s degree in a technical discipline from an accredited college or university.
• Technical Skills: Experience with LINUX, Windows and Virtualization.
• Security Clearance: Must have an active Top Secret/SCI with Polygraph cssrc conmd.

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.

Pay Range

$131,300.00 - $237,350.00

Original Posting

August 7, 2026

Pay and Benefits

• Paid Time Off
• 11 paid Holidays
• 401K with a 6% company match and immediate vesting
• Flexible Schedules
• Discounted Stock Purchase Plans
• Technical Upskilling
• Education and Training Support
• Parental Paid Leave
• and much more.
• competitive compensation
• Health and Wellness programs
• Income Protection
• Paid Leave and Retirement.

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 [e-mail].

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.

Corporate Information

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 www.Leidos.com.