Linux System Administrator (Intermediate-Level)

Job Summary

The Linux System Administrator (Intermediate-Level) is responsible for operating, maintaining, troubleshooting, securing, and supporting enterprise Linux-based systems and infrastructure. The role focuses on system availability, performance, cybersecurity compliance, vulnerability remediation, automation, backups, disaster recovery, virtualization, and infrastructure modernization within a secure enterprise environment.

Key Responsibilities

• Monitor system performance, availability, and security.
• Identify and resolve system issues to maintain operational readiness.
• Install, configure, patch, and upgrade Linux operating systems, applications, and services.
• Harden Linux systems according to DoD STIGs and cybersecurity requirements.
• Manage user accounts, permissions, authentication, and access controls.
• Configure and maintain DNS, DHCP, NTP, LDAP, SSH, web services, and file-sharing services.
• Troubleshoot complex system, application, network, and performance issues.
• Analyze security scan results and perform vulnerability remediation.
• Develop automation solutions using Bash, Ansible, and configuration-management tools.
• Perform system backups, disaster recovery, and continuity-of-operations activities.
• Support virtualization and cloud infrastructure, including VMware and Red Hat Virtualization.
• Collaborate with cybersecurity, networking, and engineering teams.
• Maintain compliance with DoD, Army, and organizational security requirements.
• Support infrastructure modernization, technology testing, and system improvements.
• Participate in incident response, root-cause analysis, and after-action reporting.
• Provide technical guidance and mentorship to junior administrators and support personnel.

Required Qualifications

• U.S. Citizen with an active DoD Secret Clearance.
• DoD 8570/8140 IAT Level II certification, such as Security+ CE, SSCP, GSEC, or equivalent.
• Minimum 3 years of relevant IT experience with hands-on Red Hat Enterprise Linux (RHEL) or derivative distributions.
• Experience writing, maintaining, and troubleshooting Bash scripts.
• Experience installing, configuring, patching, and maintaining Linux operating systems and enterprise services.
• Experience troubleshooting Linux operating systems, applications, and performance issues.
• Knowledge of Linux user accounts, permissions, file systems, processes, and system logging.
• Ability to work independently and adapt to changing requirements.
• Strong technical writing and documentation skills.
• Experience creating and maintaining technical procedures and system diagrams.
• Strong analytical, problem-solving, and communication skills.