Senior Systems Administrator - Windows & Linux Security

Yulista Holding LLC; Huntsville (AL); On-site; USD 75,000 - 110,000; Full time

Job summary

Yulista Holding LLC in Huntsville, AL seeks a System Administrator to maintain Windows and Linux servers in a secure, closed network. You will manage accounts, enforce access controls, patch systems, and harden configurations to protect critical infrastructure.

You will also configure firewalls, DNS, DHCP, backups, and disaster recovery, document baselines, monitor logs, and support hardware at the facility.

Qualifications

• 3 years of system administration experience.
• Active DoD Secret clearance required.
• Certifications such as Security+, Network+, RHCSA, or CCNA preferred.

Responsibilities

• Administer and maintain Windows and Linux servers in a closed network environment.
• Manage user accounts, access permissions, and authentication controls.
• Patching, system hardening, and secure configuration of OS and applications.
• Configure and monitor firewalls, DNS, DHCP, and connectivity services.
• Implement and test backup schedules and disaster recovery processes.
• Maintain documentation, configuration baselines, and inventories.
• Monitor logs and alerts for anomalies and troubleshoot issues.
• Support hardware installation and maintenance within the facility.

Skills

Linux administration

Windows administration

Networking fundamentals

Secure configuration

Vulnerability remediation

Backup systems

Disaster recovery

Scripting (PowerShell or Bash)

Documentation

Education

Bachelor's degree in IT, CS, or related field

Job description

Yulista Holding LLC in Huntsville, AL seeks a System Administrator to maintain Windows and Linux servers in a secure, closed network. You will manage accounts, enforce access controls, patch systems, and harden configurations to protect critical infrastructure.

You will also configure firewalls, DNS, DHCP, backups, and disaster recovery, document baselines, monitor logs, and support hardware at the facility.