Linux Systems Administrator - Secret Clearance required

General Dynamics Information Technology; Arlington (VA); On-site; USD 90,000 - 140,000; Full time

Job summary

General Dynamics Information Technology is seeking a Linux Systems Administrator in Arlington, VA to manage mission-critical Linux infrastructure and related enterprise apps. You will install, patch, monitor, and troubleshoot Red Hat systems, while enabling automation via Bash/Python scripts, Ansible, and GitLab.

You will collaborate with security, networking, and application teams, maintain documentation, and participate in on-call support and upgrades in a DoD context.

Qualifications

• Bachelor’s Degree with 3–5 years of Linux administration experience.
• Active DoD Secret clearance or higher at time of hire.
• Current CompTIA Security+ CE or DoD cybersecurity requirements.
• Technical discipline certifications such as RHCSA/RHCE or Ansible/Linux Foundation.
• Hands-on Linux administration in production environments; troubleshooting skills.

Responsibilities

• Administer and maintain Red Hat Enterprise Linux systems for enterprise apps.
• Install, configure, patch, upgrade, troubleshoot, and maintain OS lifecycle.
• Monitor health, performance, storage, logs, and services.
• Troubleshoot OS, app, storage, connectivity, authentication issues.
• Support Linux in VMware and other virtualized environments.
• Participate in upgrades, configuration changes, testing, and restoration.
• Apply DISA STIGs and security patches; develop automation scripts.
• Develop Bash/Python scripts; support Ansible and GitLab automation.
• Document procedures and maintain recovery guides; cross-train with teams.

Skills

Linux administration

Troubleshooting

Automation

Scripting (Bash/Python)

DC/VMware knowledge

Security patching

Documentation

Collaboration

Education

Bachelor's Degree

Tools

Red Hat Enterprise Linux

VMware

Ansible

GitLab

RHCSA/RHCE

Job description

Linux Systems Administrator

Transform technology into opportunity as a Linux Systems Administratorwith 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 PLACE

• 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

OWN YOUR OPPORTUNITY

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.