Linux Systems Administrator - TS/SCI/Poly (DoD)

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

Job summary

Leidos-Dynetics is seeking a Linux Systems Administrator to ensure secure, compliant operation of information systems at the Huntsville site. You'll perform system design, maintain Linux/Windows endpoints, and coordinate with the IA team to meet DoD standards.

The role requires TS/SCI clearance with polygraph and DoD IAT II certification, plus hands-on experience across networks and security tools. Ideal candidates will have a strong background in vulnerability management, STIGs, and privileged

Qualifications

• Bachelor's degree or equivalent experience and 8+ years of System Administration experience.
• 4+ years administering Linux operating systems.
• Must hold DoD TS/SCI with ability to obtain Poly clearance (priority for active polygraph).
• DoD 8570 / 8140 IAT Level II certification (Security+ CE, CCNA Security, CySA+, GICSP, GSEC, CND, SSCP).
• Ability to manage multiple networks in a dynamic environment.
• Familiarity with RMF requirements for Windows, Linux, and network devices.
• Strong written and verbal communication skills.

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 proper marking, handling, and storage of classified materials.
• Maintain baseline configuration of information systems.
• Lead projects across the Area of Responsibility.
• Adopt new technologies and train staff to stay compliant.
• Maintain a robust virtual and physical environment.

Skills

Linux administration

Networking

Windows administration

Vulnerability scanning

Security STIGs

Communication skills

Stakeholder collaboration

Privileged access management

Compliance

Risk Management Framework

Education

Bachelor's degree or equivalent experience

DoD 8570/8140 IAT Level II certification

Tools

RHCSA

Ansible

TACLANE

Security+ CE

CCNA Security

CySA+

GICSP

GSEC

CND

SSCP

Job description

Leidos-Dynetics is seeking a Linux Systems Administrator to ensure secure, compliant operation of information systems at the Huntsville site. You'll perform system design, maintain Linux/Windows endpoints, and coordinate with the IA team to meet DoD standards.

The role requires TS/SCI clearance with polygraph and DoD IAT II certification, plus hands-on experience across networks and security tools. Ideal candidates will have a strong background in vulnerability management, STIGs, and privileged