Senior Linux Systems Engineer – DoD Classified Environments

Astrion; Columbia (MD); On-site; USD 145,000 - 165,000; Full time

Job summary

Astrion is seeking a Senior Linux Systems Administrator in Columbia, MD, on-site to manage Linux servers, HPC cluster, and enterprise storage across classified networks. You will build, patch, and harden systems to DoD RMF and STIG standards, with air-gapped patching and strong automation.

Required are TS/SCI clearance, 8+ years in DoD/classified environments, and deep RHEL expertise. Expect on-site work Monday–Friday at the Columbia facility with DoD compliance focus.

Qualifications

• Active TS/SCI clearance required.
• Bachelor's degree in Computer Science, Information Technology, or related field (or equivalent experience).
• 8+ years of Linux systems administration in DoD/DoW or classified environments.
• Deep RHEL expertise including installation, patching, performance tuning, kernel, storage, and networking.
• Scripting and automation with Bash, Python, Ansible.
• LDAP/SSSD, Kerberos, FreeIPA/AD integration.

Responsibilities

• Administer, patch, and sustain RHEL servers and workstations across multiple isolated networks.
• Build, harden, and baseline Linux systems to STIGs and remediate findings.
• Administer and tune the HPC cluster, including workload scheduler and storage.
• Automate provisioning and remediation with Bash, Python, and Ansible, including air-gapped systems.
• Perform patching on air-gapped networks via offline processes.

Skills

Active TS/SCI clearance

RHEL administration

Scripting & automation

LDAP/SSSD Kerberos/AD integration

RMF & STIG compliance

HPC cluster administration

NetApp ONTAP administration

Air-gapped patching

Ansible automation

SIEM & log analysis

Education

Bachelor's degree in CS/IT or related field

Equivalent experience

Tools

PBS Professional

Red Hat Satellite

Nessus/ACAS

C2C security tooling

Job description

Astrion is seeking a Senior Linux Systems Administrator in Columbia, MD, on-site to manage Linux servers, HPC cluster, and enterprise storage across classified networks. You will build, patch, and harden systems to DoD RMF and STIG standards, with air-gapped patching and strong automation.

Required are TS/SCI clearance, 8+ years in DoD/classified environments, and deep RHEL expertise. Expect on-site work Monday–Friday at the Columbia facility with DoD compliance focus.