Linux Systems Administrator - Secret Clearance required

General Dynamics - IT; Arlington (VA); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Growth opportunities

Internal mobility

Competitive pay & PTO

Military-friendly culture

Job summary

General Dynamics - IT is seeking a Linux Systems Administrator to support mission‑critical enterprise infrastructure in a DoD environment. You will administer Red Hat Enterprise Linux systems, perform OS installation, patching, upgrades, monitoring, and troubleshooting, and contribute to automation with Bash/Python, Ansible, and GitLab.

You will work with diverse teams across networks, cybersecurity, and application management, maintaining documentation and supporting on-call operations to

Qualifications

• Bachelor's degree; 4 years may substitute in lieu of degree.
• Active DoD Secret clearance or higher at time of hire.
• CompTIA Security+ CE or equivalent DoD cybersecurity cert.
• RHCSA/RHCE or equivalent Linux/infrastructure certs.
• 3–5 years Linux administration experience in production.

Responsibilities

• Administer and maintain RHEL systems for mission-critical apps.
• Install, patch, upgrade, troubleshoot, and maintain OS and apps.
• Monitor health, performance, storage, logs, services, and connectivity.
• Automate repetitive tasks with Bash, Python, Ansible; support GitLab workflows.
• Support virtualization (VMware) and enterprise infrastructure management.
• Apply DISA STIGs and document procedures; assist on-call support.

Skills

Linux administration

Troubleshooting

Automation

Documentation

Collaboration

Education

Bachelor's Degree

DoD Secret clearance

CompTIA Security+ CE

RHCSA/RHCE or equivalent

Tools

Red Hat Enterprise Linux

VMware

Ansible

GitLab

Python

Bash

Job description

Linux Systems Administrator

Transform technology into opportunity as a Linux Systems Administrator with GDIT. In this role, you will support mission‑critical enterprise IT systems and contribute to the modernization of agency operations. At GDIT, our people make the difference. As an Linux Systems Administrator, you will help ensure today’s operations remain secure while enabling a smarter tomorrow. GDIT is seeking a motivated Linux Systems Administrator to support mission critical enterprise infrastructure and network management applications within a Department of Defense environment. This position is ideal for an infrastructure professional with strong Linux administration fundamentals who wants to expand their expertise across enterprise network management, identity and access management, automation, cybersecurity, and infrastructure management technologies. Prior experience with all supported applications is not required. The selected candidate will work alongside experienced engineers and progressively develop expertise across the enterprise application environment.

How an Linux System Administrator will make an impact

Administer and maintain Red Hat Enterprise Linux systems supporting mission critical enterprise applications. Perform operating system installation, configuration, patching, upgrades, troubleshooting, and lifecycle maintenance. Monitor operating system and application health, resource utilization, storage, logs, services, and system performance. Troubleshoot Linux operating system, application, storage, connectivity, authentication, and performance issues. Support Linux systems operating within VMware and other virtualized environments. Support enterprise applications including Cisco ISE, Aruba ClearPass, RSA SecurID, LDAP, InfoBlox, CloudVision, AirWave, Cisco Prime, Junos Space, CyberSecure IMS, and related infrastructure management technologies. Participate in application upgrades, maintenance, configuration changes, testing, troubleshooting, and service restoration. Apply security patches, vulnerability mitigations, DISA STIG requirements, and approved configuration standards. Develop Bash, Python, or other approved scripts to automate recurring administrative activities. Support Ansible and GitLab based automation and configuration management. Identify opportunities to improve system reliability, reduce manual activities, and increase operational efficiency. Maintain system documentation, standard operating procedures, configuration information, troubleshooting guides, and recovery procedures. Participate in cross training, business hours operational support, and scheduled on call support.

WHAT YOU’LL NEED TO SUCCEED (Required)

Education: Bachelor’s Degree. An additional 4 years of experience may be substituted in lieu of degree.

Clearance: Active DoD Secret clearance or higher at time of hire.

Certification(s): Current CompTIA Security+ CE or equivalent certification meeting applicable DoD cybersecurity workforce requirements.

Technical Certification: Current certification in at least one relevant technical discipline, such as:

RHCSA or RHCE Red Hat Ansible certification Linux Foundation certification Equivalent Linux, networking, virtualization, or infrastructure certification

Experience: 3 to 5 years of professional experience in Linux administration, systems administration, infrastructure engineering, enterprise application support, or a related technical discipline. At least 2 years of hands on Linux administration experience in a production environment. Experience troubleshooting operating system, application, connectivity, or infrastructure issues.

Preferred Qualifications

• Red Hat Enterprise Linux experience.
• Bash or Python scripting.
• Ansible and GitLab experience.
• Knowledge of TCP/IP, DNS, LDAP, SNMP, and enterprise networking fundamentals.
• Experience applying DISA STIG requirements.
• Experience supporting classified, disconnected, or air gapped environments.
• Exposure to ISE, ClearPass, RSA, InfoBlox, CloudVision, AirWave, Cisco Prime, Junos Space, or similar enterprise infrastructure platforms.

What Will Make You Successful

Strong troubleshooting and analytical skills. Technical curiosity and ability to learn unfamiliar technologies. Initiative to identify problems and improvement opportunities. Interest in automation and continuous improvement. Ability to document and share technical knowledge. Ability to collaborate across systems, networks, cybersecurity, monitoring, and application teams.

GDIT IS YOUR PLACEAt 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, and competitive pay and paid time off
• Community: Award-winning culture of innovation and a military-friendly workplace

Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.