RHEL Linux Systems Administrator

Position: RHEL 8 Linux Systems Administrator
Job Description

Description

We are seeking an experienced RHEL 8+ Linux Systems Administrator specializing in Red Hat Enterprise Linux (RHEL) 8 or later to support and maintain secure, mission-essential, air gapped information systems. You will have a strong background in enterprise Linux administration, cybersecurity best practices, and operations within isolated or high-assurance computing environments working in our El Segundo, CA office.

Key Responsibilities:

* Install, configure, harden, and maintain RHEL 8+ systems across air gapped environments.

* Perform system patching, repository management, and package deployment without external network connectivity.

* Develop and maintain system baselines, documentation, and configuration standards aligned with security and compliance requirements.

* Monitor system performance, troubleshoot issues, and support incident response activities.

* Implement STIGs, CIS benchmarks, and other hardening guidelines as required.

* Support secure configuration of system services, authentication, logging, auditing, and access controls.

* Coordinate with cybersecurity, network, and GRC teams to ensure ongoing compliance with internal and external controls.

* Automate routine tasks using shell scripting, Ansible, or similar tooling.

* Assist with system integration, data transfers, and cross-domain solutions in isolated environments.

* Collaboratively work across cybersecurity, GRC, and infrastructure teams.

* Solid problem-solving skills and a security-first mindset.

Qualifications

This is you:

* Bachelors Degree and five (5) years or more experience or an additional 4 years of experience may be used in lieu of degree.

* Must have an active Top Secret clearance with in-scope SSBI/T5 background investigation with the ability to obtain and maintain Sensitive Compartmented Information and Special Access Program accesses.

* Must be willing to be nominated for access to Sensitive Compartmented Information and Special Access Programs and consent to a polygraph examination (as required).

* Must have applicable DoD 8140 (formerly DoD 8570) certification (e.g. Security+, CISSP, or equivalent).

* Must have strong documentation process experience.

* 3+ years administering Linux systems in an enterprise setting.

* Hands-on experience with RHEL 8 or later.

* Demonstrated experience supporting air gapped, isolated, or high-security information systems.

* Strong understanding of system hardening, patching, and configuration management in offline environments.

* Proficiency with Bash or Python scripting.

* Knowledge of SELinux, systemd, LVM, and networking fundamentals.

* Familiarity with security compliance frameworks, STIGs, CIS benchmarks, or similar.

Preferred Qualifications:

* Red Hat certifications (RHCSA, RHCE).

* Experience with Ansible or other automation/orchestration tools.

* Background supporting systems in defense, aerospace, or other regulated industries.

* Experience with virtualization (KVM, VMware) and container technologies (Podman, Docker, Kubernetes) in restricted environments.

Target salary range: $120,001 - $160,000. The estimate displayed represents the typical salary range for this position based on experience and other factors.

Overview

SAIC accepts applications on an ongoing basis and there is no deadline.

SAIC is a premier mission integrator focused on advancing the power of technology and innovation to serve and protect our world. Our robust portfolio of offerings across the defense, space, intelligence, and civilian markets includes secure high-end solutions in mission IT, enterprise IT, engineering services, and professional services. We integrate emerging technology, rapidly and securely, into mission critical operations that modernize and enable critical national imperatives.

We are approximately 23,000 strong; driven by mission, united by purpose, and inspired by opportunities. SAIC is an Equal Opportunity Employer. Headquartered in Reston, Virginia, SAIC has annual revenues of approximately $7.3 billion. For more information, visit  For ongoing news, please visit our newsroom.