Senior Linux Systems Admin - RH, Automation & On-Call

Dexian; Reston (VA); On-site; USD 110,000 - 165,000; Full time

Job summary

Dexian is seeking an experienced Systems Administrator to support a mission-critical federal program in Reston, VA. The role focuses on Linux system administration, automation, scripting, and secure networking.

Responsibilities include deploying and maintaining RHEL environments, building automation, and validating security compliance with CIS, NIST, and DISA standards. The candidate will mentor junior staff and collaborate across teams in a dynamic, mission-driven setting.

Qualifications

• Bachelor's degree or equivalent in CS/IS/Cybersecurity or related field.
• 10+ years of Linux/UNIX system administration experience with Windows interoperability.
• RHCSA/RHCE/RHCA certification.
• Proficiency in scripting with BASH, Perl, Python, or JavaScript.
• Hands-on experience with Ansible and RHEL Satellite.
• Familiarity with container runtimes (formerly Docker), cloud services like AWS, and GitLab.
• Strong problem-solving, communication, and documentation skills.
• Ability to work independently and in a team; on-call rotation.

Responsibilities

• Design, deploy, troubleshoot, and maintain Red Hat Enterprise Linux Server environments (version 8 and 9).
• Develop and maintain automation scripts using BASH, Perl, JavaScript, or Python.
• Perform admin tasks from the command line interface; automate tasks with Ansible and RHEL Satellite.
• Manage package deployment and updates across geographically dispersed environments.
• Configure and administer network services (NFTables, Firewalld, IPTables, DNS, Postfix/SMTP).
• Oversee Linux server clustering, NFS, PXE, and SELinux configurations; support containers and cloud platforms.
• Collaborate with teams and mentor junior staff; maintain architecture documentation.
• Ensure security hardening per CIS, NIST SP 800-53 Rev 5, and DISA STIGs.

Skills

BASH

Perl

Python

JavaScript

Automation

Networking

Documentation

On-call

Education

RHCSA

RHCE

RHCA

Bachelor's degree or equivalent

Tools

Ansible

RHEL Satellite

GitLab

AWS

Job description

Dexian is seeking an experienced Systems Administrator to support a mission-critical federal program in Reston, VA. The role focuses on Linux system administration, automation, scripting, and secure networking.

Responsibilities include deploying and maintaining RHEL environments, building automation, and validating security compliance with CIS, NIST, and DISA standards. The candidate will mentor junior staff and collaborate across teams in a dynamic, mission-driven setting.