Senior Linux Systems Administrator
Location: Huntsville, AL
Clearance: Active Secret Clearance Required
Estimated Salary: $100,000 – $150,000
Source: reddit-r-forhire
About KBR & Trinzic
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.
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. 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.
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.
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.
- Administer workstation desktop environments including GNOME configuration, session security, and peripheral support.
- Integrate RHEL systems with identity and authentication services (Red Hat IdM, Active Directory via SSSD, Kerberos, LDAP, and CAC/PKI).
- Develop and maintain Ansible playbooks, roles, and shell/Python scripts for automation.
- Manage storage and file services including LVM, XFS, NFS, and multipath configurations.
- Monitor system performance, capacity, and availability; perform root cause analysis.
- Plan and execute OS upgrades, migrations, and modernization initiatives.
- Coordinate with Information Assurance and Cybersecurity personnel to maintain compliance with RMF, NIST 800-53, and DISA STIGs.
- Develop and maintain system documentation, hardware/software inventories, and SOPs.
- Serve as Tier 2/3 escalation point and mentor junior administrators.
- Act as a technical advisor to leadership regarding Linux architecture and lifecycle planning.
Basic Qualifications
- U.S. Citizenship required.
- Active Secret clearance required.
- Bachelor’s degree in IT, 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.
- Experience with configuration management and automation (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 OS, storage, networking, and application layers.
- Experience developing technical documentation and SOPs.
Preferred Qualifications
- Red Hat certifications (RHCSA, RHCE, RHCA).
- DoD 8140 / 8570 IAT Level II certification (e.g., Security+ CE).
- Experience supporting classified DoD environments, including air-gapped/disconnected networks.
- Experience implementing RMF-compliant systems (NIST 800-53, SCAP, ACAS/Nessus).
- Experience administering Red Hat Satellite.
- Experience with Red Hat Identity Management (IdM), SSSD, Kerberos, and CAC/PKI.
- Experience with Ansible Automation Platform or Tower/AWX.
- Experience with RHEL workstation support for engineering/modeling/simulation, including GPU drivers.
- Experience with containers and virtualization technologies on RHEL.
- Experience with log aggregation and monitoring (Splunk, rsyslog, ELK).
Belong, Connect and Grow at KBR
At KBR, we are passionate about our people and our Zero Harm culture. We foster 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.