Senior Secure Systems Administrator (Linux/Windows)

Calista Corporation; Huntsville (AL); On-site; USD 85,000 - 110,000; Full time

Job summary

Yulista Holding LLC seeks a skilled IT Systems Administrator to maintain Windows and Linux servers in a secure, closed network. You will manage accounts, permissions, and authentication while performing patching and hardening to meet security standards.

Responsibilities include configuring network services, disaster recovery testing, and documenting configurations. Candidates should have DoD Secret clearance or be eligible, with relevant certifications preferred.

Qualifications

• 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 DoD Secret clearance required; security certifications preferred.

Responsibilities

• 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.

Skills

Linux administration

Windows administration

Networking fundamentals

PowerShell / Bash scripting

Documentation & analytics

Education

Bachelor's degree in IT/CS or related field

Tools

RHCSA

CCNA

Security+

Job description

Yulista Holding LLC seeks a skilled IT Systems Administrator to maintain Windows and Linux servers in a secure, closed network. You will manage accounts, permissions, and authentication while performing patching and hardening to meet security standards.

Responsibilities include configuring network services, disaster recovery testing, and documenting configurations. Candidates should have DoD Secret clearance or be eligible, with relevant certifications preferred.