Senior Linux Systems Administrator

Title:

Senior Linux Systems Administrator

At KBR, we deliver science, technology and engineering solutions to governments and companies around the world. KBR employs approximately 37,000 people worldwide with customers in more than 85 countries and operations in over 28 countries. KBR is proud to work with its customers across the globe to provide technology, value-added services, and long-term operations and maintenance services to ensure consistent delivery with predictable results.

Trinzic is the future independent company to be created through the planned spin-off of KBR's Mission Technology Solutions business, expected in January 2027. Our people work at the frontier of what is possible, delivering solutions in challenging environments and advancing some of the world's highest-priority national security and space missions.

Backed by decades of mission success, deep expertise, and trusted partnerships, Trinzic will launch as a global organization with more than 18,000 employees supporting customers around the world. Join us at a defining moment and help shape the future of a company built to tackle complex challenges and make a meaningful impact.

Candidates who join KBR's Mission Technology Solutions business before the spin-off will transition to Trinzic when the separation is complete and will not need to reapply for employment.

Program Summary

KBR’s Missile, Aviation, and Ground Systems (MAGS) division delivers mission engineering solutions for critical U.S. Army programs, specializing in aviation and ground systems, integrated air and missile defense, and threat and target systems. As a trusted partner of the U.S. Department of War, MAGS provides innovative, technology-driven solutions to enhance national security. With a global presence and a strong ethical framework, KBR ensures secure, effective, and mission-ready capabilities worldwide.

Job Summary

As a Senior Linux Systems Administrator, you will serve as the technical lead and subject matter expert for Red Hat Enterprise Linux (RHEL) servers and workstations supporting classified and unclassified mission environments.

This role focuses on the build, configuration, hardening, administration, and sustainment of RHEL systems across the full lifecycle, from provisioning and baseline development through patching, compliance, and decommissioning.

The successful candidate will be responsible for maintaining secure, stable, and standardized Linux environments while leading automation efforts, supporting cybersecurity compliance requirements, and mentoring junior administrators.

Working closely with cybersecurity personnel, infrastructure engineers, program leadership, and end users, you will help ensure reliable, scalable, and secure operation of Linux systems supporting mission execution.

Key Responsibilities

• Design, deploy, administer, and troubleshoot RHEL servers and engineering workstations in physical, virtual, and air-gapped environments.

• Develop and maintain standardized RHEL server and workstation baselines, configurations, and golden images.

• Administer provisioning, content, subscription, and patch management tooling, including in disconnected environments.

• Implement and maintain DISA STIG configurations and security controls, perform compliance scanning, and remediate vulnerabilities across Linux systems.

• Administer workstation desktop environments including GNOME configuration and lockdown, session security settings, and peripheral and display support.

• Integrate RHEL systems with identity and authentication services including Red Hat IdM, Active Directory via SSSD, Kerberos, LDAP, and CAC/PKI smart card authentication.

• Develop and maintain Ansible playbooks, roles, and shell or Python scripts to automate configuration management, compliance enforcement, and routine administration.

• Manage storage and file services on Linux systems including LVM, XFS, NFS, and multipath configurations.

• Monitor system performance, capacity, availability, and log data, and perform root cause analysis on complex system issues.

• Plan and execute OS upgrades, migrations, and modernization initiatives supporting resiliency and automation.

• Coordinate with Information Assurance and Cybersecurity personnel to maintain compliance with RMF, NIST 800-53, DISA STIG, and organizational security requirements, and support system accreditation activities.

• Develop and maintain system documentation, hardware and software inventories, and standard operating procedures.

• Serve as Tier 2 and Tier 3 escalation point for Linux issues and mentor junior administrators on RHEL administration, security hardening, and automation practices.

• Serve as a technical advisor to program leadership regarding Linux architecture, lifecycle planning, technology refresh, and risk reduction efforts.

Basic Qualifications

• U.S. Citizenship required.

• Active Secret clearance required.

• Bachelor’s degree in Information Technology, Computer Science, Engineering, Cybersecurity, or related STEM field with 8+ years of relevant experience. Equivalent experience may be considered.

• Experience administering RHEL servers and workstations in an enterprise environment.

• Experience implementing and maintaining DISA STIG hardening and SELinux on RHEL systems.

• Experience with configuration management and automation using Ansible, Bash, or Python.

• Experience with Linux patch management, package management (DNF/YUM, RPM), and repository management.

• Experience integrating Linux systems with enterprise identity, authentication, and directory services.

• Experience troubleshooting complex issues spanning the OS, storage, networking, authentication, and application layers.

• Experience developing and maintaining technical documentation and standard operating procedures.

Preferred Qualifications

• Red Hat Certified System Administrator (RHCSA), Red Hat Certified Engineer (RHCE), Red Hat Certified Architect (RHCA), or other relevant industry certifications.

• DoD 8140 / 8570 IAT Level II certification (e.g., Security+ CE)

• Experience supporting classified Department of Defense environments, including air-gapped and disconnected networks.

• Experience implementing RMF-compliant systems and controls, including NIST 800-53, SCAP Compliance Checker, ACAS/Nessus, and vulnerability management practices.

• Experience administering Red Hat Satellite, including content views, lifecycle environments, and disconnected content synchronization.

• Experience with Red Hat Identity Management (IdM), SSSD, Kerberos, and CAC/PKI smart card authentication on Linux.

• Experience with Ansible Automation Platform or Ansible Tower/AWX.

• Experience with RHEL workstation support for engineering, modeling and simulation, or software development users, including GPU drivers and specialized application deployment.

• Experience with containers and virtualization technologies on RHEL.

• Experience with Splunk, rsyslog, ELK, or comparable log aggregation and monitoring platforms.

Belong, Connect and Grow at KBRAt KBR, we are passionate about our people and our Zero Harm culture. These inform all that we do and are at the heart of our commitment to, and ongoing journey toward being a People First company. That commitment is central to our team of team’s philosophy and fosters an environment where everyone can Belong, Connect and Grow. We Deliver – Together.

KBR is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, disability, sex, sexual orientation, gender identity or expression, age, national origin, veteran status, genetic information, union status and/or beliefs, or any other characteristic protected by federal, state, or local law.