System Administrator III

Maintain and secure the IT infrastructure supporting a collateral storage facility operating on a closed, isolated network. Responsibilities include administration of Windows and Linux systems, configuration of secure network services, management of backup and recovery processes, enforcement of access control, and implementation of security hardening measures., * Administer and maintain Windows and Linux servers in a closed network environment.

• Manage user accounts, access permissions, and authentication controls.
• Perform patching, system hardening, and secure configuration of operating systems 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.

• Proficiency with Linux and Windows administration.
• Knowledge of networking fundamentals (DNS, DHCP, routing, firewalls).
• Understanding of secure configuration standards and vulnerability remediation.
• Familiarity with backup systems and disaster recovery.
• Ability to script using PowerShell or Bash.
• Strong analytical and documentation skills., * Bachelor’s degree in IT, CS, or related field; or equivalent experience.
• 3 years of system administration experience.
• Experience with Linux and Windows server environments.
• Active DoW Secret clearance required.
• Certifications such as Security+, Network+, RHCSA, or CCNA preferred.