Linux Systems Administrator - Secret Clearance required

General Dynamics Information Technology; Virginia (MN); On-site; USD 132,000 - 178,000; Full time

Job summary

General Dynamics Information Technology is seeking a Linux Systems Administrator to support mission-critical enterprise IT systems in a DoD environment. You will help modernize agency operations while ensuring secure, reliable Linux infrastructure.

Ideal candidates have 3–5 years in Linux administration, active DoD Secret clearance or higher, and relevant certifications. The role involves automation, scripting, and collaboration across networks and cybersecurity teams.

Qualifications

• Education: Degree preferred, experience may be substituted for degree.
• Clearance: Active DoD Secret clearance or higher at time of hire.
• Certification(s): Current CompTIA Security+ CE or equivalent certification meeting DoD requirements.
• Technical Certification: Certification in at least one relevant discipline (RHCSA/RHCE, Ansible, Linux Foundation or equivalent).
• Experience: 3–5 years in Linux administration, systems administration, or related field; 2+ years in production Linux environment.

Responsibilities

• Administer and maintain Red Hat Enterprise Linux systems supporting mission critical applications.
• Perform OS installation, configuration, patching, upgrades, troubleshooting, and lifecycle maintenance.
• Monitor OS and application health, resources, storage, logs, services, and performance.
• Troubleshoot Linux OS, application, connectivity, or infrastructure issues.
• Support Linux systems in VMware and other virtualized environments.
• Support enterprise apps like ISE, ClearPass, RSA, LDAP, InfoBlox, CloudVision, AirWave, Cisco Prime, Junos Space, CyberSecureIMS.
• Participate in upgrades, maintenance, configuration changes, testing, and service restoration.
• Develop Bash or Python scripts to automate recurring tasks.
• Support Ansible and GitLab automation and CM.
• Maintain system documentation and runbooks.
• Cross training, on-call support, and business-hours coverage.

Skills

Automation Management

Critical Infrastructures

Network Operations

Network Performance

Reverse Engineering

Education

Degree preferred

Tools

RHCSA

RHCE

Red Hat Ansible certification

Linux Foundation certification

Equivalent Linux, networking, virtualization, or infrastructure certification

Job description

Type of Requisition:

Regular

Clearance Level Must Currently Possess:

Secret

Clearance Level Must Be Able to Obtain:

Secret

Public Trust/Other Required:

None

Job Family:

IT Infrastructure and Operations

Job Qualifications:

Skills:

Automation Management, Critical Infrastructures, Network Operations, Network Performance, Reverse Engineering

Certifications:

None

Experience:

5 + years of related experience

US Citizenship Required:

Yes

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,CyberSecureIMS, 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: Degree preferred,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

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, 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.

The likely salary range for this position is $131,750 - $178,250. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Scheduled Weekly Hours:

40

Travel Required:

Less than 10%

Telecommuting Options:

Onsite

Work Location:

USA VA Arlington

Additional Work Locations:

Total Rewards at GDIT:

Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

Our Identity Verification Process:

As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

About Our Work:

We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission-ready capabilities in AI, cloud, cyber and software development.

Join our Talent Community to stay up to date on our career opportunities and events at

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Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans