Linux Engineer

Senior Linux Systems Administrator (DoD / Security-Focused)

Employment Type

Full-Time

Clearance Requirement

Ability to obtain and maintain a U.S. Government Security Clearance
U.S. Citizenship required

Job Overview

We are seeking a Senior Linux Systems Administrator to support and secure enterprise Linux environments in a Department of Defense (DoD)–regulated setting. This role is responsible for administering, hardening, and maintaining Linux-based infrastructure across physical and virtual environments while ensuring continuous compliance with cybersecurity frameworks such as RMF, STIGs, CMMC, and NIST.

The ideal candidate has deep Linux systems experience, a strong security mindset, and the ability to automate and standardize system operations in high‑availability environments.

Responsibilities

• Configure, deploy, administer, and support Linux-based systems (Red Hat, Rocky, Ubuntu) across production and non-production environments
• Implement and maintain system hardening using STIGs and security baselines
• Identify, analyze, and remediate vulnerabilities uncovered through scans, audits, and compliance reviews
• Support Risk Management Framework (RMF) activities, including documentation and control implementation
• Automate system administration tasks using Ansible, scripting (Bash, Python), and centralized management tools
• Manage centralized Linux infrastructure using tools such as Red Hat Satellite, Foreman, or Ansible
• Integrate Linux systems with Windows Active Directory / LDAP for identity, authentication, and access control
• Assist with the installation and support of development and engineering tools
• Serve as a technical escalation point for Linux-related incidents, troubleshooting, and projects
• Produce and maintain detailed configuration, security, and maintenance documentation
• Participate in a modest-level 24x7 on-call rotation supporting mission-critical systems

Required Qualifications

• 7+ years of Linux system administration experience in enterprise environments
• Strong expertise with Linux distributions (RHEL, Ubuntu, CentOS, Rocky, Amazon Linux)
• Hands-on experience with Linux system hardening, STIG implementation, and vulnerability remediation
• Experience with Ansible for configuration management and automation
• Experience integrating Linux systems with Active Directory / LDAP
• Familiarity with RMF and compliance-driven environments
• Proficiency in Bash and/or Python scripting
• Experience managing systems in virtualized environments
• DoD 8140-compliant certification (or ability to obtain)
• Bachelor’s degree in Computer Science, Computer Engineering, or related field (or equivalent experience)

Preferred Qualifications

• Experience supporting systems in AWS environments
• Experience working with ESS (Enterprise Support Services)
• Knowledge of and experience with NIST 800-53 and NIST 800-171
• Understanding of the Cybersecurity Maturity Model Certification (CMMC) and CUI handling requirements
• Prior experience in DoD, federal government, or defense contractor environments

Required Technical Skills

Must Have:

• Ansible
• Linux (RHEL, Ubuntu, CentOS/Rocky/Amazon Linux)
• STIGs
• RMF
• CMMC

Nice to Have:

• AWS

Additional Information

This position supports secure, mission-critical systems in a regulated environment. Candidates must be comfortable working within strict compliance frameworks and collaborating with security, engineering, and operations teams.