RHEL Linux Systems Administrator

Minimum Clearance Required TS.SCI

Location: El Segundo, CA, US

Date Posted:

Category: Information Technology

Subcategory: Sys Administrator

Schedule: Full-Time

Shift: Day Job

Travel: Yes - 10% of the time

Clearance Level Must Be Able to Obtain: TS/SCI with Poly

Potential for Remote Work: _SITE

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.

• 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.

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.

• 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.