Senior Linux Systems Administrator - Classified Infra

The Johns Hopkins University Applied Physics Laboratory; Laurel (MD); On-site; USD 105,000 - 290,000; Full time

Job summary

The Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, MD is seeking a Linux Systems Administrator to design, deploy, and secure on‑prem classified Linux systems. You will install, patch, monitor, and troubleshoot across physical and virtual environments while ensuring compliance with security policies and DoD requirements.

You will work with ISSO/ISSM teams to validate security, manage access controls, and support customer needs.

Qualifications

• Bachelor's degree or equivalent professional experience in a relevant field.
• In-depth Linux administration experience (RH-based distros).
• Experience with classified networks and security controls.
• 5+ years Linux systems administration experience.
• RHCSA and active DoD 8570 certification eligibility or attainment.
• Experience with SSO/AD integration and virtualization/containerization.

Responsibilities

• Manage, configure, and maintain classified Linux-based systems with patches and monitoring.
• Implement security measures and perform audits, vulnerability assessments, and updates.
• Collaborate with ISSO/ISSM to maintain network security posture and access controls.
• Provide technical support, root cause analysis, and project assistance in a classified environment.
• Respond to incidents, coordinate with IT peers and external resources to minimize downtime.
• Develop and maintain SOPs, configurations, and troubleshooting guides.

Skills

Linux systems administration

Security clearance process

DoD 8570 certification

RHCSA

Active Top Secret SCI w/poly clearance

Team collaboration

Automation skills

SSO/AD integration

Education

Bachelor's degree in Computer Science / Information Technology or related field

Master's degree in Information Systems / Cybersecurity / CS

Tools

VMware

KVM

Docker

Podman

Kubernetes

Gitlab

Confluence

Jira

Salt-Stack

Job description

The Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, MD is seeking a Linux Systems Administrator to design, deploy, and secure on‑prem classified Linux systems. You will install, patch, monitor, and troubleshoot across physical and virtual environments while ensuring compliance with security policies and DoD requirements.

You will work with ISSO/ISSM teams to validate security, manage access controls, and support customer needs.