Linux Systems Administrator

Description Top Secret SCI w/ Polygraph Clearance required

We are seeking a highly skilled Systems Administrator / Infrastructure Engineer to support, maintain, and optimize complex enterprise infrastructure environments. The ideal candidate will have strong experience in Red Hat Enterprise Linux (RHEL) administration, network engineering, monitoring solutions, workflow automation, and Public Key Infrastructure (PKI). This role requires a technically versatile professional who can administer and troubleshoot enterprise systems, automate operational processes, manage infrastructure monitoring tools, and support Commercial Off-the-Shelf (COTS) applications within secure or specialized environments. The successful candidate will work across systems and network infrastructure to ensure availability, reliability, security, and optimal performance.

• Develop, implement, and maintain automated workflows and data processes using scripting languages such as Bash, Python, or similar technologies.
• Administer, configure, maintain, and optimize Nagios monitoring solutions to support infrastructure health, system availability, and performance monitoring.
• Perform advanced system administration within Red Hat Enterprise Linux (RHEL) environments, including command-line operations, configuration management, troubleshooting, and system optimization.
• Support Public Key Infrastructure (PKI), including certificate management, installation, renewal, troubleshooting, and lifecycle maintenance.
• Perform network engineering and troubleshooting activities involving routing, switching, TCP/IP, and enterprise-scale network infrastructure.
• Install, configure, maintain, and troubleshoot Commercial Off-the-Shelf (COTS) applications and tools within secure or specialized environments.
• Monitor system performance, identify infrastructure issues, and implement corrective actions to improve reliability and operational efficiency.
• Troubleshoot complex hardware, software, operating system, and network-related issues across interconnected infrastructure environments.
• Collaborate with engineering, cybersecurity, network, and operations teams to support infrastructure stability and mission-critical services.
• Develop and maintain technical documentation, operational procedures, and system configuration records.

Requirements

Top Secret SCI w/ Polygraph Clearance required

• Demonstrated experience automating workflows and data processes using Bash, Python, or comparable scripting languages.
• Hands-on experience administering, configuring, and tuning Nagios monitoring systems.
• Strong proficiency with Red Hat Enterprise Linux (RHEL), including advanced command-line system administration.
• Working knowledge of Public Key Infrastructure (PKI), digital certificates, and certificate lifecycle management.
• Solid network engineering background, including routing, switching, TCP/IP, and troubleshooting in large-scale network environments.
• Experience supporting and maintaining COTS applications and tools in secure, restricted, or specialized environments.
• Strong understanding of system administration, infrastructure troubleshooting, and performance optimization.
• Ability to diagnose and resolve complex technical issues across enterprise systems and network environments.