Linux Support Technician - Tier II

IPSecure is seeking an experienced Tier II Linux Support Technician to provide advanced technical engineering, administration, troubleshooting, and cybersecurity support for enterprise Ubuntu Linux environments supporting Department of Defense (DoD) mission operations.

The successful candidate will possess extensive hands‑on Linux engineering experience, with demonstrated expertise administering Ubuntu systems in production environments. This position requires advanced troubleshooting capabilities, security hardening experience, enterprise patch management, virtualization expertise, and the ability to independently diagnose and resolve complex operating system and infrastructure issues.

The Tier II Linux Support Technician will serve as the primary technical escalation resource for Tier I personnel and coordinate complex technical issues requiring Tier III support through established program management channels.

The position will primarily operate from IPSecure's Port San Antonio location, with on‑site support at the customer's location as mission requirements dictate.

• Provide advanced administration, maintenance, troubleshooting, and operational support for enterprise Ubuntu Linux systems.
• Perform detailed root‑cause analysis of complex operating system, application, networking, performance, and infrastructure issues.
• Diagnose and resolve recurring system failures, configuration conflicts, service interruptions, and operational deficiencies.
• Analyze system logs, kernel messages, resource utilization, and performance metrics to identify underlying technical issues.
• Develop and implement corrective actions to improve system stability, security, and operational performance.
• Provide technical guidance and escalation support to Tier I technician.

• Administer and troubleshoot Ubuntu Pro, Expanded Security Maintenance (ESM), and Livepatch capabilities.
• Validate ESM and Ubuntu Universe security patches prior to deployment.
• Conduct regression testing to verify patch compatibility, application functionality, and system stability.
• Configure and maintain management profiles.
• Develop and execute staggered patch deployment campaigns through Landscape.
• Monitor patch compliance, identify failed deployments, and troubleshoot update‑related issues.
• Maintain accurate system configuration, patching, and remediation documentation.

• Administer and troubleshoot MAAS (Metal as a Service), including system commissioning and provisioning activities.
• Diagnose and resolve Linux Containers (LXD) configuration, deployment, networking, and operational issues.
• Troubleshoot Kernel‑based Virtual Machine (KVM) virtualization environments, including virtual machine provisioning, resource allocation, and connectivity.
• Investigate hardware compatibility, firmware, driver, and operating system integration issues.
• Assist tier III and engineering personnel with hardware readiness, physical system access, firmware updates, driver updates, and implementation of approved recommendations.
• Support enterprise Linux infrastructure configuration and operational readiness.

• Implement and maintain Ubuntu Linux security configurations aligned with applicable DoD cybersecurity requirements.
• Apply the Ubuntu Security Guide (USG) to support automated security hardening and compliance validation.
• Configure systems in accordance with applicable DISA STIGs and CIS Benchmarks.
• Review vulnerability scan results, identify security deficiencies, and implement appropriate remediation actions.
• Troubleshoot security configuration…