Senior Linux Systems Administrator — DoD TS/SCI (Onsite)

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

Job summary

Astrion is seeking a Senior Linux Systems Administrator to build, secure, and sustain Linux servers, HPC cluster, and enterprise storage across three isolated networks in Columbia, MD. On-site role requiring TS/SCI readiness and DoD RMF compliance.

Ideal candidate has deep RHEL expertise, strong scripting (Bash, Python, Ansible), and experience with DoD 8140 certifications, air-gapped patching, and storage management (NetApp ONTAP).

Qualifications

• 8+ years of Linux systems administration in DoD/classified environments.
• Deep expertise in RHEL administration, patching, and performance tuning.
• Scripting and automation using Bash, Python, and Ansible.
• LDAP/SSSD and Kerberos, FreeIPA or AD integration.
• Experience implementing DoD STIG compliance on Linux.
• HPC cluster administration with PBS Professional or similar.
• Enterprise storage administration (NetApp ONTAP, NFS).
• Knowledge of RMF, DISA requirements, and accreditation processes.
• DoD 8140 compliant baseline and computing environment certifications.
• Offline patching on air-gapped networks; ACAS/Nessus scanning.
• SIEM integration and log analysis.

Responsibilities

• Administer and sustain RHEL servers/workstations across isolated networks.
• Baseline Linux systems to STIGs; remediate findings.
• Manage HPC cluster compute nodes, PBS, storage FS.
• Administer NetApp ONTAP, NFS/CIFS exports, backups.
• Automate provisioning with Bash, Python, Ansible; offline patching.
• Support RMF continuous monitoring and ACAS/SCAP scans.
• Collaborate with cybersecurity and operations teams.
• Develop system docs, diagrams, SOPs, and security artifacts.
• Triage and troubleshoot complex multi-network issues.
• Assist audits and compliance validations.

Skills

Linux administration

Bash scripting

Python

Ansible

Identity management

DoD STIG compliance

HPC administration

NetApp ONTAP

RMF

Vulnerability scanning

Patch management

Red Hat Satellite

ACAS/Nessus

PBS Professional

Education

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

Tools

Red Hat Satellite

Nessus

SCAP

PBS Professional

NetApp ONTAP

Job description

Astrion is seeking a Senior Linux Systems Administrator to build, secure, and sustain Linux servers, HPC cluster, and enterprise storage across three isolated networks in Columbia, MD. On-site role requiring TS/SCI readiness and DoD RMF compliance.

Ideal candidate has deep RHEL expertise, strong scripting (Bash, Python, Ansible), and experience with DoD 8140 certifications, air-gapped patching, and storage management (NetApp ONTAP).