Linux System Administrator

Leidos; Huntsville (AL); On-site; USD 95,000 - 140,000; Full time

Job summary

Leidos seeks a Linux Systems Administrator for on-site work in Huntsville. You will ensure secure, efficient operation of information systems, perform vulnerability scans, and implement STIGs to maintain regulatory compliance in a DoD environment.

Ideal candidates have DoD TS/SCI with Poly, 8+ years of system administration, 4+ years Linux, and relevant IA certifications. Strong communication and cross-team collaboration are essential.

Qualifications

• Bachelor’s degree plus eight years in system administration, or equivalent.

Responsibilities

• Perform system design and new hardware/software implementation.

Skills

Linux administration

Network devices

Windows systems

Clearance TS/SCI with Poly

IAT Level II certs

Communication skills

Education

Bachelor's degree

Tools

RHCSA

Ansible

TACLANE

Job description

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.
• 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