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60 Entarian Senior Linux Systems Engineer Jobs Hiring Near You

Astrion

Sr. Linux Systems Administrator

Columbia, MD · On-site

$145K - $165K/yr

Overview Senior Linux Systems Administrator LOCATION: Columbia, MD (Onsite) JOB STATUS: Full-time ... Red Hat Certified Engineer (RHCE) or Red Hat Certified Architect (RHCA) * HPC experience with PBS ...

Astrion

Sr. Linux Systems Administrator

Columbia, MD · On-site

$145K - $165K/yr

Overview Senior Linux Systems Administrator LOCATION: Columbia, MD (Onsite) JOB STATUS: Full-time ... Red Hat Certified Engineer (RHCE) or Red Hat Certified Architect (RHCA) * HPC experience with PBS ...

Hitachi

Senior Linux Systems Engineer

Houston, TX · On-site

Bachelor's degree in Computer Science, Engineering, or equivalent experience in years * 5+ years of experience in Linux system administration and automation * Proficiency with Ansible, Python, and ...

GDIT

$88K - $117K/yr

Skills: Documentations, Linux, Systems Design, Systems Engineering Certifications: Certified ... As a Senior Linux System Engineer, you will help ensure today is safe and tomorrow is smarter. Our ...

Hitachi

Senior Linux Systems Engineer

Santa Clara, CA · On-site

Bachelor's degree in Computer Science, Engineering, or equivalent experience in years * 5+ years of experience in Linux system administration and automation * Proficiency with Ansible, Python, and ...

TalTeam

Senior Linux Systems Engineer

Washington, DC · On-site

... Network/Systems design and assessment Switching, Firewall, VPN/setup maintenance Linux ... engineers The successful candidate will have: Experience with following: AWS migration and ...

GDIT

$88K - $117K/yr

Skills: Documentations, Linux, Systems Design, Systems Engineering Certifications: Certified ... As a Senior Linux System Engineer, you will help ensure today is safe and tomorrow is smarter. Our ...

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Infographic showing various Senior Linux Systems Engineer job openings at Entarian in the United States as of August 2026, with employment types broken down into 98% Full Time, and 2% Part Time. Highlights an 82% Physical, 6% Hybrid, and 12% Remote job distribution.

Sr. Linux Systems Administrator

Astrion

Columbia, MD • On-site

$145K - $165K/yr

Full-time

Posted 8 days ago

Job description

Overview
Senior Linux Systems Administrator
LOCATION: Columbia, MD (Onsite)
JOB STATUS: Full-time
CLEARANCE: Active Top Secret / TS/SCI (Required)
TRAVEL: Less than 10%
SALARY RANGE: $145k - $165k
Astrion has an exciting opportunity for a highly experienced Senior Linux Systems Administrator to build, secure, and sustain the Linux server and workstation estate, the high-performance computing (HPC) cluster, and the enterprise storage that run across three or more isolated classified networks supporting Department of Defense/Department of War (DoD/DoW) environments in Columbia, MD. The ideal candidate brings deep Red Hat Enterprise Linux (RHEL) expertise, extensive experience operating inside closed and air-gapped classified enclaves, and a proven record of building and maintaining systems in compliance with Risk Management Framework (RMF), DoD STIG, and Comply-to-Connect (C2C) requirements. This position requires Monday through Friday on-site work at our facility in Columbia, MD.
REQUIRED QUALIFICATIONS / SKILLS
  • Active TS/SCI security clearance (required)
  • Bachelor's degree in Computer Science, Information Technology, or related field (or equivalent experience)
  • 8+ years of Linux systems administration experience within DoD/DoW or classified environments
  • Deep expertise in:
    • RHEL administration (installation, patching, performance tuning, kernel and systemd, storage, and networking)
    • Scripting and automation (Bash, Python, Ansible)
    • Linux identity and authentication (LDAP/SSSD, Kerberos, FreeIPA or AD integration)
  • Demonstrated experience implementing and maintaining DoD STIG compliance on Linux
  • Hands-on experience administering an HPC cluster (workload scheduler such as PBS Professional or similar)
  • Experience administering enterprise storage (NetApp ONTAP, NFS)
  • Strong understanding of:
    • RMF (Risk Management Framework)
    • DISA security requirements and accreditation processes
    • DCSA accreditation standards
  • Active DoD 8140 (formerly DoD 8570) compliant baseline certification (e.g., Security+ CE, CISSP)
  • Active DoD 8140 compliant computing environment certification (e.g., minimum Red Hat Certified System Administrator (RHCSA))
  • Experience with:
    • Offline and air-gapped patching (Red Hat Satellite or internal repositories)
    • ACAS or Nessus and SCAP scanning
    • SIEM integration and log analysis
    • Continuous monitoring under RMF

KEY COMPETENCIES
  • Advanced Linux systems administration and troubleshooting
  • Security hardening and compliance enforcement
  • Automation and scripting
  • Strong analytical and problem-solving abilities
  • Excellent communication and documentation skills
  • Ability to operate in high-security, mission-critical environments

PREFERRED QUALIFICATIONS / SKILLS
  • Red Hat Certified Engineer (RHCE) or Red Hat Certified Architect (RHCA)
  • HPC experience with PBS Professional
  • NetApp Certified Data Administrator (NCDA)
  • Automation at scale (Ansible Automation Platform, Git-based configuration management)
  • Zero Trust architectures and containerization (Podman, Kubernetes) in classified environments
  • Prior experience supporting Cross Domain Solutions (CDS) programs
  • Experience with cloud-based DoD environments (e.g., Azure Government, Azure Secret)
  • Project management experience and experience briefing executive leadership

RESPONSIBILITIES
  • Administer, patch, and sustain RHEL servers and workstations across three or more isolated classified networks, each operated as its own authorization boundary
  • Build, harden, and baseline Linux systems to DoD Security Technical Implementation Guides (STIGs); remediate findings and control configuration drift
  • Administer and tune the HPC cluster, including compute nodes, the workload scheduler (e.g., PBS Professional), the shared or parallel filesystem, and the low-latency interconnect
  • Administer NetApp storage (ONTAP), including volumes, NFS and CIFS exports, snapshots, capacity planning, and backup and recovery
  • Automate provisioning, configuration, and remediation with Bash, Python, and Ansible, including on disconnected systems
  • Perform patching and updates on air-gapped networks through approved offline processes (e.g., Red Hat Satellite or internal repositories and trusted media transfer)
  • Administer Linux identity and access (LDAP/SSSD, Kerberos, FreeIPA or Active Directory integration, sudo, PAM), enforcing least privilege
  • Implement and maintain C2C and 802.1x posture for Linux endpoints and integrate with the security tool stack
  • Perform vulnerability remediation and continuous monitoring in accordance with RMF controls; run and interpret ACAS and SCAP scans and review audit logs
  • Support the Authority to Operate (ATO) process, including STIG checklists, POA&Ms, and risk assessments
  • Develop and maintain system documentation, diagrams, SOPs, and security artifacts
  • Troubleshoot complex issues across multi-network, multi-vendor environments
  • Collaborate with cybersecurity, network, systems engineering, and mission stakeholders to ensure secure, reliable operations
  • Support audits, inspections, and compliance validation activities

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