Linux Systems Administrator

The Digital Modernization Sector has a career opportunity for a Linux Systems Administrator supporting the Global Solutions Management - Operations II (GSM-O II) contract at DISA. This contract includes the Operations, Sustainment, Maintenance, Repair, and Defense of the Defense Information System Network (DISN) within the DOD Information Network (DODIN) in support of the Defense Information Systems Agency (DISA). It also includes support to other key tasks for DISA, including the transformation of DISA's operational mission through innovation, and support to DISA's mission partners.

Candidate must be able to be at the customer site at Fort Meade, Scott AFB, or Hill AFB as needed. Minimum Secret clearance and Security + are required upon start.

Primary Responsibilities

• Work independently to ensure the reliability, availability, and security by proactively monitoring the system, troubleshooting, and resolving issues to ensure high availability and continuity of operations.
• Be able to work in a fast-paced environment and must be able to work independently.
• Maintain configuration management and baseline control of development, test, pre-production, and production environments.
• Conduct regular security scans, analyze results, and implement resolutions including testing of new hardware and software and ensure compliance with DISA STIGs
• Operate and maintain the environments, including patching of operating systems and COTS/FOSS/GOTS
• Perform and test regular backups.
• Monitor and tune system and network performance, including RHEL and VMWare systems, for optimal system availability.
• Configure, manage, and maintain components of the SDN solution (application servers, load balancers, databases, operating systems, etc.)
• Deploy SDN and ENET systems in the Lab environment, integrate with other systems, perform testing and validation.
• Manage, track, and maintain configuration items including licenses, SSL certificates and the hardware/software baseline.
• Support ENET baseline deployments, upgrades and updates to the production environment including the installation and configuration of new software and hardware.
• Configure and maintain applications including Juniper Nortstar/Routing Director in both the SDN on premises and GMS cloud based environments.
• Create, maintain, and implement detailed documentation and maintain standard operating procedures.
• Perform trend analysis on component failures, network/node outages, and system performance parameters.
• Interact with software and hardware vendors to evaluate vendor products and make recommendations to purchase hardware and software.
• Work with network engineers and developers to troubleshoot environment issues as necessary.
• Train new hires on the environments and applications.
• Identify and propose solutions for issues or needed tasks.
• Escalate support issues to vendors as necessary and coordinate resolution.
• Manage access including creation and management of user and service accounts.
• Provide support on a M-F business hours schedule, also responsible for on-call, extended hour, and weekend support as required by mission or emergency situations.
• Responsible for entire projects or processes spanning multiple technical areas.
• Manages large projects or processes with moderate impact on the achievement of sub-family results.
• Communicates with internal team members across multiple areas and client team members.
• May communicate with parties external to the organization (e.g., sub-contractors, vendors, etc.).
• Works to influence project/team leaders regarding solution design, process and/or approaches.

Basic Qualifications

• Requires expert knowledge of Linux and ability to apply advanced technical principles, theories, and concepts.
• Strong background in Linux or UNIX server setup, deployment, and maintenance
• Significant experience examining error logs, systems performance data.
• Familiar with best practices and techniques to maintain and enhance information security.
• The candidate must have Bachelor's Degree with 8-12+ years of prior relevant experience or a Master's Degree with 6-10+ years of prior relevant experience. Will consider work experience in lieu of a degree.
• The candidate must have an active Secret clearance.
• Must have CompTIA Security+ Certification or its equivalence.
• Be able to work in a fast-paced environment and must be able to work independently.

Preferred Qualifications

• AWS Experience
• Jira or similar ticket tracking system
• Knowledge of security hardening procedures for Linux
• Experience with VM environments
• Excellent communication skills
• Networking Skills

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:
February 10, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $92,300.00 - $166,850.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.