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 adecuado 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
📌 Sr. Linux Systems Administrator (Colombia)
🏢 Astrion
📍 Colombia
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