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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Linux Systems Administrator Senior Principal - **Company:** General Dynamics Information Technology - **Location:** Fairfax, VA, United States - **Experience:** Expert - **Salary:** $112,840.0 - $138,000.0 - **Contract:** Permanent contract - **Skills:** Software Applications, Bash Shell, Server Message Block, Configuration Management, Computer Networks, System Configuration, Data Centers, Linux, File Systems, Monitoring of Systems, Python (Programming Language), Linux Kernel, Linux System Administration, Linux Security Modules, Linux Servers, Package Management Systems, Public Key Infrastructure, Windows PowerShell, Red Hat Enterprise Linux, Ansible, Software Deployment, System Programming, TCP/IP, Data Logging, Scripting, File Transfer Protocol (FTP), Git, Infrastructure Automation Frameworks, Information Technology, Iptables, Terraform, Cyber Warfare, Scap Compliance Checker, Network Server, User Administration - **Published:** September 30, 2026 - **Apply:** https://www.techcareers.com/job.asp?id=3412429000&tx=JT9284TYZ&pt=1&aff=0B19D771-A501-4A5E-8338-2A822B784D54&utm_source=Job%20Feed&utm_medium=textkernel&utm_campaign=DE&utm_term=0B19D771-A501-4A5E-8338-2A822B784D54 ## About the Role Linux,Linux Security,Red Hat Enterprise Linux (RHEL) Experience: 8 + years of related experience, * 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 Required Technical Skills: * Strong Linux administration skills with knowledge of enterprise network architectures * Experience developing automation and scripted deployments to improve operational efficiency * Skilled in scripting for automation (Bash, Python) * Solid understanding of Linux internals (system calls, file systems, processes) * Working knowledge of TCP/IP and related protocols (HTTP, FTP, NFS) * Excellent problem-solving, analytical, and decision-making skills * Strong verbal communication and documentation abilities * Strong organizational, collaborative, and team-oriented mindset Desired Skills: * Experience with Ansible for configuration management and automation * Experience with Terraform for infrastructure as code * Experience using PowerShell for task automation * Experience with Red Hat Satellite Server for centralized lifecycle and errata management * Experience preparing Linux systems for DoD Cyber Defense Command (DCDC) Cyber Operational Risk Assessments (CORA) * Red Hat Certified System Administrator (RHCSA) or Red Hat Certified Engineer (RHCE) ## 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 Security & Compliance * 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 Automation & Infrastructure as Code * 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. Documentation & Team Collaboration * 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 ## Related Videos - [An Applied Introduction to eBPF with Go](https://www.wearedevelopers.com/videos/1075-an-applied-introduction-to-ebpf-with-go) - [Develop on Windows, Deploy on Red Hat Enterprise Linux](https://www.wearedevelopers.com/videos/1600-develop-on-windows-deploy-on-red-hat-enterprise-linux) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Turning Container security up to 11 with Capabilities](https://www.wearedevelopers.com/videos/718-turning-container-security-up-to-11-with-capabilities) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)