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# Linux System Administrator

- **Company:** Plus3 IT Systems
- **Location:** Reston, VA, United States
- **Salary:** $100,000.0 - $159,000.0
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, CentOS, Cloud Computing, System Configuration, Dynamic Host Configuration Protocol, Linux, Domain Name System (DNS), Subnetting, Network Connections, Routing, Open Source Technology, Red Hat Enterprise Linux, TCP/IP, Computer Network Technologies, Firewalls (Computer Science)
- **Published:** September 4, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=4eb8dfad7dacf820

## About the Role

* US Citizen, o Ph.D.: 0+ years of experience required.
o Master's Degree: 3+ years of experience required.
o Bachelor's of Science Degree: 5+ years of experience required
o 4 additional years of experience may be substituted for a BS degree

 * Proven experience configuring and supporting CentOS and/or Red Hat Enterprise Linux (RHEL).
 * Hands-on experience working within the Risk Management Framework (RMF) and implementing Security Technical Implementation Guides (STIGs), preferred.
 * Strong familiarity with RPM, YUM, DNF, and dependency resolution workflows.
 * Solid understanding of core networking concepts (TCP/IP, DNS, DHCP, routing, subnets, and firewalls).
 * Ability to troubleshoot technical challenges and execute complex tasks independently without heavy supervision.
 * Comfort managing multiple competing priorities in a dynamic work environment.

Certifications Needed:

 * Security + or higher
 * Cloud certification from any of the major Cloud providers, AWS Preferred, * A passion for working on cutting-edge, high-profile projects and a drive for delivering solutions
 * An insatiable curiosity: you ask why, proactively exploring and sharing ideas
 * A love for learning new technologies and sharing them with your team
 * A keen interest in utilizing Cloud-based and Open Source tools for problem-solving
 * Strong verbal and written communication skills for effective collaboration with customers, vendors, and engineering teams to solve complex business problems

## Description

* Provision, maintain, and administer enterprise Linux environments (primarily CentOS and RHEL).
 * Oversee package installation, update pipelines, and dependency management across internal systems.
 * Ensure infrastructure compliance with federal security frameworks, executing RMF controls and applying DISA STIGs.
 * Diagnose and resolve system performance issues, network connectivity, and storage configurations with minimal guidance.
 * Maintain core networking capabilities, ensuring proper integration with system services and routing.
 * Adapt quickly to changing project scopes, organizational needs, and emergency support demands.