Linux System Administrator

Leidos; Huntsville (TN); On-site; USD 92,000 - 167,000; Full time

Job summary

Leidos-Dynetics seeks a Linux Systems Administrator to ensure secure, efficient operation of information systems, including vulnerability scans and STIGs for regulatory compliance. Mastery of Linux, networking, and Windows is essential, with strong collaboration across teams and stakeholders.

The role emphasizes DoD standards compliance, privileged access management, and maintaining both virtual and physical environments in a demanding setting. On-site Huntsville location preferred.

Qualifications

• Bachelor's degree with 8+ years system administration experience.
• Minimum 4+ years Linux administration experience.
• DoD TS/SCI with Poly clearance required; active polygraph prioritized.
• DoD 8570/8140 IAT II certification required.
• Experience managing multiple networks in dynamic environments.
• RMF familiarity for Windows, Linux, and network devices.
• Excellent written and verbal communication skills.

Responsibilities

• Design systems and implement new hardware/software.
• Maintain Linux, network devices, and Windows endpoints.
• Ensure information systems comply with DoD standards.
• Coordinate with IA team to meet compliance.
• Manage privileged access.
• Properly mark, handle, and store classified materials.
• Maintain baseline configurations of information systems.
• Lead multiple projects within the area of responsibility.
• Adopt new technologies and train staff to stay compliant.
• Maintain robust virtual and physical environments.

Skills

Linux administration

Security clearance DoD TS/SCI withPoly

IAT II certification

RMF familiarity

Strong communication

Education

Bachelor's degree in a relevant field

Tools

Ansible

Job description

Are you interested in advancing your career in IT System Administration?

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 DoD Top Secret/SCI clearance with ability to obtain Polygraph. NOTE: Those with a current TS/SCI and Polygraph will be given priority 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:

• Bachelors 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.
• Must currently hold minimum DoD TS/SCI with ability to obtain Poly clearance; those holding active polygraph will be given priority consideration.
• 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.Li>
• 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:

• Active TS/SCI with Polygraph.
• 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)

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 17, 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.