Senior Systems Administrator – Red Hat Linux, Windows

AMERICAN SYSTEMS

. Support on-premises Linux (80%) and Windows (20%) infrastructure and applications .

Posted 10/9/2026full-timeUnited StatesSenior💰 $150,000 - $175,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in IT Systems Administration with a focus on Linux and Windows infrastructure, including strong skills in Bash scripting, VMware virtualization, and cybersecurity compliance. Capable of optimizing system performance and managing user accounts while ensuring adherence to DoD standards.

Highest-signal resume keywords

Linux CLI AdministrationBash ScriptingVMware VirtualizationDoD 8140 IAT Level II CertificationActive TOP SECRET Clearance

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Linux AdministrationWindows AdministrationSystem Performance OptimizationResource MonitoringUser Account ManagementDatabase AdministrationDNS AdministrationCloud Platform DesignContainerizationAnsible Automation

Tools & Technologies

VSphereOracle Database AppliancesDockerPodmanOpenLDAP

Certifications & Qualifications

DoD 8140 IAT Level II CertificationSecurity+ CE

Industry Keywords

STIGsRMFDoD Cybersecurity StandardsTier III SupportMission-Critical Applications

Tech Stack

Tools & technologies

AnsibleCloudCyber SecurityDNSDockerLinuxOracleVMware

About the role

Key responsibilities & impact

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, including ticket submission and tracking
Monitor resource availability and ensure sufficient hardware, software, and throughput
Review and optimize system performance for mission-critical applications
Analyze system resource usage and apply corrective actions
Review system and application logs and ensure scheduled tasks and backups are completed
Create and manage user accounts, groups, and permissions
Maintain local repositories in a RHEL-based environment
Support on-premises and remote Linux-based Oracle database appliances
Develop and maintain administrative Bash scripts for system maintenance and automation
Administer DNS
Document and implement system administration solutions to meet business requirements
Partner with cybersecurity and engineering teams while owning and optimizing enterprise Linux and Windows infrastructure across multiple datacenters

Requirements

What you’ll need

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 experience, including 3–5 years of Linux CLI administration
DoD 8140 IAT Level II certification, such as Security+ CE or equivalent
Experience designing and maintaining secure, scalable cloud/on-prem platforms (IL5–IL6+)
Knowledge of STIGs, RMF, and DoD cybersecurity standards
Knowledge of containerization, including Docker/Podman
Knowledge of Ansible for automation and OpenLDAP
Experience with VMware virtualization
Strong CLI and Bash scripting experience
U.S. citizenship required for obtaining/holding a U.S. security clearance

Benefits

Comp & perks

$5,000 sign-on bonus
Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance
100% employee-owned company