Linux System Administrator

Leidos Inc; Huntsville (AL); On-site; USD 92,300 - 166,850; Full time

Job summary

Leidos-Dynetics seeks a Linux Systems Administrator to ensure secure and efficient operation of information systems in a DoD environment. Mastery of Linux, networking, and Windows is essential for success across a diverse tech landscape.

The role requires vulnerability scans, STIG implementation, and collaboration with cross‑sector teams to maintain compliance with DoD standards while managing privileged access and secure configurations.

Qualifications

• Bachelor’s degree plus eight years of System Administration experience or equivalent.
• “4+ years administering Linux operating systems.”
• “Top Secret clearance required.”
• “DoD Directive 8570/8140 IAT II certification (Security+ CE, CCNA Security, CySA+, GICSP, GSEC, CND, SSCP).”
• “RMF familiarity for Windows, Linux, and network devices.”
• “Excellent written and verbal communication with stakeholders.”

Responsibilities

• Perform system design and new hardware/software implementation.
• Maintain Linux, network devices, and Windows endpoints.
• Keep information systems compliant and aligned with DoD standards.
• Coordinate with Information Assurance to meet compliance.
• Manage privileged access management.

Skills

Linux

Networking

Windows

IAT II Certification

RMF familiarity

Communication skills

Privileged access mgmt

Education

Bachelor's degree

RHCSA

Tools

Ansible

TACLANE

Job description

Description

Leidos‑Dynetics, within our Corporate Information Security Office (CISO and reporting through our Digital Modernization sector), is seeking a motivated Linux Systems Administrator to become a part of our team. In this role, you will be responsible for ensuring the secure and efficient operation of various information systems. This includes conducting regular vulnerability scans and implementing Security Technical Implementation Guides (STIGs) to maintain regulatory compliance. Mastery of Linux, networking, and Windows is critical for success in our diverse technological environment. Furthermore, effective communication with stakeholders and collaboration with cross‑sector teams will be necessary to achieve organizational objectives.

At Leidos‑Dynetics, we recognize the value of having a high‑performing workforce and are committed to providing opportunities for employees by encouraging career growth and movement across the enterprise. We view career development as a partnership between employees, managers, and the company with a focus on building skills and experiences through internal mobility. To support career development, we offer a variety of resources in addition to training and educational opportunities within an inclusive environment.

Location: All work will be performed on‑site in our Huntsville office.

Clearance: You must hold a current Top Secret clearance to qualify for consideration.

What We Value:

We’re not just looking for expertise; we value a positive attitude, adaptability to changing priorities, and a commitment to delivering results. Our ideal candidate is a reliable troubleshooter, adept at handling multiple priorities with excellent coping skills. Whether working independently or collaboratively, you’re self‑managed and customer‑focused.

Key Responsibilities:

• Perform system design and new hardware/software implementation.
• Maintain Linux, Network devices, and Windows endpoints.
• Keep information systems compliant and aligned with DOD standards.
• Coordinate with the Information Assurance team to meet compliance.
• Manage privileged access management.
• Ensure the proper marking, handling, and storage of classified materials.
• Maintain baseline configuration of various information systems.
• Work on multiple projects, leading projects that fall within the area of responsibility.
• Adopt new technologies and ensure that all staff members are trained to keep them compliant.
• Maintain a robust virtual and physical environment.

Experience and Skills:

• Bachelor’s degree coupled with a minimum of eight (8) years of System Administration experience. Equivalent relevant work experience may be considered in lieu of a degree.
• Minimum of 4+ years administering Linux operating systems.
• Currently hold active DoD Top Secret clearance.
• DoD Directive 8570/8140 Information Assurance Technical (IAT) Level II certification. (Security+ CE, CCNA Security, CySA+, GICSP, GSEC, CND, SSCP)
• Demonstrate ability to manage multiple networks in a dynamic, demanding environment.
• Possess familiarity with Risk Management Framework requirements for Windows systems, Linux systems, and network devices.
• Demonstrate ability to interface effectively with security agencies, customers, and management.
• Strong written and verbal communication skills.

Preferred Qualifications:

• Previous experience maintaining networks in classified environments.
• Understanding of network concepts, Type 1 encryption devices (e.g., TACLANE), and cybersecurity tools.
• Knowledge of VOIP.
• Experience with Ansible.
• RHCSA (Red Hat Certified System Administrator).

Pay Range: $92,300.00 - $166,850.00

Original Posting: July 9, 2026

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 www.Leidos.com.

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 www.leidos.com/careers/pay-benefits.

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 [e-mail].

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.