Systems Administrator; Linux​/RHEL

Position: Systems Administrator (Linux / RHEL)
** Req :
** RQ228053

** Type of

Requisition :
** Regular

** Clearance Level Must Be Able to Obtain:
** Top Secret/SCI

** Public Trust/Other

Required:

** None

** Job Family:
** IT Infrastructure and Operations

*
* Skills:

*
* Assured Compliance Assessment Solution (ACAS),Linux Management,Red Hat Enterprise Linux (RHEL)

*
* Certifications:

*
* Red Hat Certified System Administrator (RHCSA) | Red Hat
- Red Hat, Red Hat Certified Engineer (RHCE) | Red Hat
- Red Hat, Linux Professional Institute Linux Essentials | Linux Professional Institute (LPI) - Linux Professional Institute (LPI), CompTIA Security+ CE | CompTIA
- CompTIA

*
* Experience:

*
* 3 + years of related experience

** US Citizenship

Required:

*
* Yes

*
* Job Description:

*
* The  
** Compliance Systems Administrator (Linux / RHEL)
** plays a critical, hands-on role in securing and maintaining enterprise Red Hat Enterprise Linux (RHEL) and Unix-based operating systems. This position is responsible for the direct technical execution of system hardening, patching, identity integration, and vulnerability remediation to ensure Linux servers and appliances adhere to Department of War (DoW) cybersecurity standards in preparation for CORA cyber inspections.

** HOW A Compliance Systems Administrator (Linux) WILL MAKE AN IMPACT*
* *
* Duties and Responsibilities:

*
* + Remediate security findings identified through ACAS/Tenable reports and OpenSCAP scans by performing hands-on system patching, configuration updates, and service hardening on RHEL 8/9 systems.

+ Technically implement and maintain compliance with Red Hat Enterprise Linux DISA STIGs, Cyber Tasking Orders (CTOs), and IAVM notices.

+ Configure, troubleshoot, and enforce mandatory access controls using SELinux (Security-Enhanced Linux) in enforcing mode.

+ Manage and maintain central identity, PAM (Pluggable Authentication Modules), SSSD, and DoW PKI/CAC authentication mechanisms for user and administrative access.

+ Configure and maintain host-based firewalls (firewalled/iptables) and audit daemon logging (audited) in strict compliance with DoW auditing requirements.

+ Utilize package management tools (YUM/DNF), Red Hat Satellite, or local repositories to deploy security errata and software updates across air-gapped or restricted networks.

+ Develop and execute Bash and Ansible playbooks to automate STIG hardening, configuration audits, and compliance validation.

+ Develop, implement, and document technical mitigation strategies and POA&Ms for system-specific Linux vulnerabilities that cannot be immediately fixed.

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

** Required Qualifications and

Certifications:

*
* + Applicable Intermediate DoW 8140 or DoW 8570 Certification (e.g., Security+ CE, CySA+, Linux+, or SSCP).

+ Bachelor's Degree in a related discipline OR three (3) years of hands-on experience administering and hardening Red Hat Enterprise Linux (RHEL) environments.

+ Direct experience in Linux system administration, command-line operations (CLI), user management, and package patching.

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

+ Familiarity with reviewing ACAS/Tenable vulnerability reports and executing Linux-specific remediation steps.

+ Understanding of PKI certificate installation and PAM/SSSD authentication integration.

+  
** Location** :
Tampa, Florida (USCENTCOM)

+  
** Clearance** :
Active Secret

+  
** Travel:
** up to 10% (CONUS/OCONUS)

** Desired

Skills and Experience:

*
* + Red Hat Certified System Administrator (RHCSA) or Red Hat Certified Engineer (RHCE).

+ Experience supporting USCENTCOM Linux server infrastructure.

+ Hands-on experience writing Ansible playbooks and Bash scripts for STIG compliance 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).

** GDIT IS YOUR PLACE*
* At GDIT, the mission is our purpose, and our people are at the center of everything we do.

+ Growth: AI-powered career tool that identifies career steps and learning opportunities

+ Support:
An internal mobility team focused on helping you achieve your career goals

+ Rewards:
Comprehensive benefits and wellness packages, 401K with company match, competitive pay and paid time off

+ Community:
Award-winning culture of innovation and a military-friendly workplace

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