RHEL 8 Linux Systems Administrator

Location: El Segundo, CA. Full-time, day shift with up to 10% travel. Must be able to obtain and maintain TS/SCI with polygraph clearance. Potential for on-site or remote work.

About the role

We are seeking an experienced RHEL 8+ Linux Systems Administrator to support and maintain secure, mission-essential, air-gapped information systems in our El Segundo, CA office.

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.
• Collaborate across cybersecurity, GRC, and infrastructure teams with a security-first mindset.

Requirements

• Bachelor’s degree and five (5) years or more of experience, or an additional 4 years of experience in lieu of degree.
• Active Top Secret clearance with in-scope SSBI/T5 background investigation; ability to obtain and maintain Sensitive Compartmented Information and Special Access Program accesses.
• Willingness to be nominated for access to Sensitive Compartmented Information and Special Access Programs and consent to a polygraph examination (as required).
• Applicable DoD 8140 (formerly DoD 8570) certification (e.g., Security+, CISSP, or equivalent).
• 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.
• Strong documentation process experience.

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.

Pay

Target salary range: $120,001 – $160,000, based on experience and other factors.