Linux Systems Administrator Senior Principal

Clearance Level Must Currently Possess:

Clearance Level Must Be Able to Obtain:

Job Family:

Job Description:

We are seeking a Senior Linux Engineer to support enterprise Infrastructure Management and Compliance operations. This role combines hands-on Red Hat Enterprise Linux (RHEL) system administration with security hardening, compliance remediation, and infrastructure automation. The ideal candidate is a proactive problem solver, communicates clearly, and documents processes well, partnering closely with project/team leadership to keep systems compliant and operations running smoothly.

Provide system administration support for Linux operating systems including installing software, applying patches, managing file systems, monitoring performance, and troubleshooting alerts from monitoring tools

Configure and troubleshoot RHEL 9 systems, resolving issues associated with the operating system, servers, hardware, and applications software; perform system failure analysis and recovery

Responsible for daily monitoring of interface programs between multiple enterprise systems; review daily logs and ensure successful completion

Perform incremental and full cold backups/patching

Provide performance metrics and usage charts, including CPU usage, disk usage, and network uptime for Linux servers

Provide general maintenance, upgrades, and new installation of servers; coordinate with data center personnel to execute

Responsible for DoW Linux Security Technical Implementation Guides (STIGs)

Remediate security findings identified through ACAS/Tenable reports and OpenSCAP scans by performing hands-on system patching, configuration updates, and service hardening on RHEL 9 systems

Configure and maintain host-based firewalls (firewalld/iptables) and audit daemon logging (auditd) in compliance with DoW auditing requirements

Develop, implement, and document technical mitigation strategies and POA&Ms for Linux vulnerabilities that cannot be immediately fixed

Compile technical evidence, OpenSCAP evaluation reports, and configuration artifacts for CORA inspection teams

Develop and maintain automation and scripted deployment solutions to streamline system provisioning, configuration management, and compliance validation, reducing manual effort and speeding up operations

Utilize package management tools in GIT or local repositories to deploy security errata and software updates across air-gapped or restricted networks

Be familiar with the operations of Ansible and Terraform to work with IaC engineers establishing standardized deployments.

Responsible for creating and/or maintaining standard operating procedures for the Linux documentation library

Document and generate business processes for day-to-day and emergency support procedures, with strong written and verbal communication

Coordinate with project and team leadership to meet deadlines and objectives; capable of delivering training sessions as needed

Present ideas clearly in team meetings and project-level discussions

Technical Training, Certification(s) or Degree

8+ years of demonstrated experience administering RHEL 8/9 servers

Bachelor's degree in information technology, computer science, or related technical discipline preferred

Secret Security Clearance

Direct experience in Linux system administration, CLI operations, user management, and package patching

Hands-on experience configuring and troubleshooting RHEL 9 systems

Experience handling NFS, CIFS, and SMB permissions

Hands-on experience applying DISA STIGs to RHEL systems using SCAP Compliance Checker (SCC) or OpenSCAP

Experience reviewing ACAS/Tenable vulnerability reports and executing Linux-specific remediation

Understanding of PKI certificate installation and PAM/SSSD authentication integration

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