Senior Enterprise Red Hat Enterprise Linux (RHEL) Administrator

The Senior Enterprise Red Hat Enterprise Linux (RHEL) Administrator serves as a senior technical authority responsible for the administration, sustainment, security, resiliency, and modernization of enterprise Linux infrastructure supporting the Defense Threat Reduction Agency (DTRA) mission at Fort Belvoir, Virginia. The position provides advanced systems administration, troubleshooting, automation, cybersecurity compliance, and technical leadership for mission-critical environments.

The incumbent supports the Defense Stockpile Management Systems (DSMS) portfolio, including the Defense Integration and Management of Nuclear Data Services (DIAMONDS), Joint Application Design Environment (JADE), Nuclear Inventory Management and Cataloging System (NIMACS), Government Acceptance Testing (GAT), and DIAMONDS Accountability Training System (DATS). The Senior RHEL Administrator ensures these environments remain secure, available, compliant, recoverable, and capable of supporting high-priority operational requirements.

• Serve as a senior technical authority for Red Hat Enterprise Linux platforms supporting DSMS mission applications, services, and enterprise infrastructure.
• Collaborate with Government stakeholders, program leadership, cybersecurity personnel, and technical operations teams to analyze, design, configure, test, integrate, sustain, and modernize RHEL systems.
• Develop, maintain, and enforce scalable RHEL configuration-management practices, baseline configurations, automation, system hardening standards, and operational procedures.
• Conduct platform needs assessments, gap analyses, architecture reviews, and capacity evaluations; develop and implement technically sound solutions to improve availability, performance, resiliency, and maintainability.
• Deploy, configure, patch, upgrade, and sustain RHEL operating systems, applications, security tools, configuration-management services, and supporting infrastructure.
• Troubleshoot and resolve complex RHEL platform, application, network, storage, authentication, automation, and performance issues; lead root-cause analysis and document corrective actions.
• Implement, manage, validate, and audit DISA Security Technical Implementation Guides (STIGs), vulnerability remediation actions, mitigation strategies, Plan of Action and Milestones inputs, and cybersecurity compliance evidence.
• Support enterprise patching, vulnerability management, system monitoring, audit logging, backup and recovery, disaster recovery, and continuity-of-operations requirements for RHEL platforms.
• Serve as a primary technical point of contact for RHEL platform support affecting mission applications and services, coordinating resolution with Application, Database, Network, Enterprise, Cybersecurity, Virtualization, and Field Support teams.
• Develop and maintain technical documentation, standard operating procedures, implementation plans, recovery procedures, automation scripts, and configuration records.
• Provide technical leadership, mentoring, and quality assurance for junior administrators; guide implementation decisions and promote consistent, secure, and supportable RHEL operations across the enterprise.

Required Knowledge, Skills, and Abilities:

• Capability to work both independently and as part of a team.
• Strong communication and collaboration skills.
• Advanced problem solving and critical thinking abilities.
• Adept in the exclusive use and navigation of the RHEL command line interface.
• Holistic understanding of RHEL platform interactions with external applications, platforms, and services (e.g., Active Directory/LDAP integration, network file service protocols, Active Directory Certificate Services).
• Intermediate RHEL 7 and 8 platform system administration skills and knowledge of configuration of technologies and services provided.
• Significant experience with the development and execution of shell scripts.

Preferred Knowledge, Skills, and Abilities:

• Experience supporting: Appian Platform, Tenable Security Center + Nessus (ACAS), Trellix ESS (client-side), IdM, and git repositories.
• Intermediate experience with RHEL 7 and 8 platform system engineering and concepts (e.g., automation, orchestration, strategic planning).
• Understanding of DevSecOps concepts and practices.
• Basic knowledge of SecurID RSA multifactor authentication RHEL client configurations.
• Strong work ethic, motivation, and a high desire to learn.
• Effective time management and organization skills.

Qualifications:

• BS degree in a related field, this can be substituted by work experience.
• Required:  8+ years of experience.
• Required:  Fully adjudicated Top Secret clearance w/ TS/SCI eligibility.
• Preferred Certifications: Red Hat (e.g., Red Hat Certified System Administrator/RHCSA), Oracle Certified Professional - Oracle Linux System Administrator/OCP - OLSA)

GDIT IS YOUR PLACE:

● 401K with company match
● Comprehensive health and wellness packages
● Internal mobility team dedicated to helping you own your career
● Professional growth opportunities including paid education and certifications
● Cutting-edge technology you can learn from and apply to solve real world problems

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