Senior Linux Systems Administrator - Classified Infra

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

Job summary

Johns Hopkins Applied Physics Laboratory (APL) seeks a Linux Systems Administrator to design, deploy, and maintain on‑premise classified Linux systems in a secure environment. You will implement security patches, monitor performance, and work with ISSO/ISSM and other teams to protect and optimize our IT infrastructure.

Required qualifications include a Bachelor's degree in CS or related field, 5+ years of Linux administration, RHCSA, experience with SELinux, and DoD 8570 certification or ability

Qualifications

• Bachelor's degree or equivalent experience in computer science, IT, or related field.
• In-depth knowledge of Linux operating systems and administration.
• Hands-on experience administering/maintaining classified computer networks.
• 5+ years Linux systems administration experience.
• Understanding of Linux firewalls and SELinux.
• DoD 8570 certification (Security+ or CISSP) or ability to obtain within 6 months.

Responsibilities

• Manage, configure, and maintain classified Linux-based systems with OS install, config, patches, monitoring, and health checks.
• Implement security measures per compliance policies; perform audits and vulnerability assessments.
• Collaborate with ISSO/ISSM to maintain network security posture and address vulnerabilities.
• Provide end-user support in a classified environment; root-cause analysis and project assistance.
• Respond to incidents promptly; coordinate with IT peers and external resources to minimize downtime.
• Create and maintain SOPs, configurations, troubleshooting guides, and knowledge base articles.

Skills

Linux systems administration

RHCSA

Active Directory

VMware

Docker

Kubernetes

Jira

GitLab

Confluence

SSO

SELinux

STIGs

Nagios

Education

Bachelor's degree in Computer Science, Information Technology, related field or equivalent professional experience

Tools

Salt-Stack

Puppet

Ansible

Chef

Job description

Johns Hopkins Applied Physics Laboratory (APL) seeks a Linux Systems Administrator to design, deploy, and maintain on‑premise classified Linux systems in a secure environment. You will implement security patches, monitor performance, and work with ISSO/ISSM and other teams to protect and optimize our IT infrastructure.

Required qualifications include a Bachelor's degree in CS or related field, 5+ years of Linux administration, RHCSA, experience with SELinux, and DoD 8570 certification or ability