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# Systems Administrator, Senior- Red Hat Linux & Windows (Top Secr

- **Company:** AMERICAN SYSTEMS
- **Location:** Washington, DC, United States
- **Experience:** Expert
- **Salary:** $150,000.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Bash Shell, Cyber Security, Linux, Domain Name System (DNS), OpenLDAP, Oracle Databases, Performance Tuning, Red Hat Enterprise Linux, Ansible, Virtualization Technology, VMware VSphere, Containerization, Docker, User Accounts, Vmware
- **Published:** October 10, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9232170/systems-administrator-senior-red-hat-linux-windows-top-secr

## About the Role

* Active TOP SECRET clearance with SCI eligibility required; Program Access Request (PAR) submission required after hire
 * Bachelor's degree in a STEM discipline ( or additional years of relevant experience considered in lieu of degree )
 * 8-10 years of IT Systems Administration that includes 3-5 years of Linux CLI administration
 * DoD 8140 IAT Level II cert (e.g., Security+ CE or equivalent)
 * Experience designing and maintaining secure, scalable cloud/on-prem platforms (IL5-IL6+)
 * Knowledge of STIGs, RMF, and DoW cybersecurity standards
 * Knowledge of containerization (Docker/Podman), Ansible for automation, and OpenLDAP
 * Experience with virtualization (VMware)
 * Strong CLI and Bash scripting experience

## Description

As a Sr. Systems Administrator, you will:

 * Support on-premises Linux (80%) and Windows (20%) infrastructure and applications.
 * Support on-premises vSphere infrastructure across multiple datacenters.
 * Provide Tier III support for production and development environments, managing ticket submission and tracking.
 * Monitor resource availability to meet customer requirements, ensuring sufficient hardware, software, and throughput.
 * Review and optimize system performance to ensure peak efficiency and reliability for mission-critical applications
 * Analyze system resource usage and apply corrective actions when necessary
 * Review system and application logs, ensuring completion of scheduled tasks and backups
 * Create and manage user accounts, groups, and permissions; maintain local repositories in a RHEL-based environment
 * Support on-prem and remote Linux-based Oracle database appliances
 * Develop and maintain administrative bash scripts for system maintenance and automation
 * Proficient in DNS administration
 * Document and implement system administration solutions to meet business requirements