Linux Support Technician - Tier II with Security Clearance — IPSecure, Inc, San Antonio, TX

Job Description 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. Job Responsibilities Advanced Linux Support

• 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. Ubuntu Enterprise Management and Patching

• 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. Infrastructure and Virtualization

• 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. Cybersecurity and System Hardening

• 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 conflicts that impact operational functionality.

• Validate security remediation effectiveness through follow-up scanning and configuration reviews.

• Support secure configuration baselines, access controls, audit logging, and system integrity requirements.

• Coordinate with cybersecurity personnel to ensure system configurations remain aligned with established security requirements. Technical Escalation and Vendor Coordination

• Serve as the primary Tier II escalation resource for complex Ubuntu Linux technical issues.

• Perform advanced troubleshooting and root-cause analysis prior to requesting Tier III assistance.

• Document technical findings, troubleshooting activities, and recommended corrective actions.

• Coordinate Tier III escalations through established escalation process.

• Maintain technical ownership and track escalated issues through resolution.

• Validate that corrective actions provided by Tier III, to resolve the underlying technical issue and remain effective.

• Provide hands-on technical support to remote Field Engineer and Dedicated Support Engineer as needed.

• Assist with implementation and verification of approved tier III or engineering recommendations. Documentation and Operational Reporting

• Maintain detailed technical documentation, configuration records, troubleshooting procedures, and engineering findings.

• Develop and improve technical runbooks and operational procedures.

• Document patch validation results, regression testing, security hardening, and vulnerability remediation activities.

• Track escalated technical issues, resolution status, and outstanding engineering risks.

• Provide monthly operational reporting inputs, including Tier II support requests, Tier III escalations, on-site responses, patching activities, system inventory changes, and unresolved technical risks.

• Recommend improvements to Linux system administration, security compliance, and operational efficiency. Basic Qualifications

• 5+ years of hands-on Linux systems administration or engineering experience.

• 3+ years of experience administering Ubuntu Linux systems in production environments.

• Advanced knowledge of Linux operating system architecture, services, processes, file systems, permissions, and networking.

• Demonstrated experience troubleshooting complex Linux operating system and infrastructure issues.

• Strong understanding of Ubuntu package management, repositories, system updates, and security patching.

• Experience performing patch validation, regression testing, and system configuration management.

• Working knowledge of Linux virtualization technologies, including KVM and container-based environments.

• Experience implementing Linux security hardening and vulnerability remediation.

• Familiarity with DISA STIGs, CIS Benchmarks, and enterprise cybersecurity compliance requirements.

• Experience analyzing system logs, performance metrics, and operating system diagnostic information.

• Proficiency with Bash scripting and Linux command-line administration.

• Strong technical documentation, analytical, and communication skills.

• Ability to independently manage complex technical issues while coordinating with engineering teams and external support organizations.

• 8140 certification required (Security+)

• RHCSA, RHCE, LPIC-2, LPIC-3, or equivalent professional certifications preferred Preferred Qualifications

• Experience supporting Ubuntu Linux systems within DoD or Federal Government production environments.

• Hands-on experience with Canonical Landscape, MAAS, LXD, Ubuntu Pro, Livepatch, and ESM.

• Experience using Ubuntu Security Guide (USG) for security hardening and compliance validation.

• Experience implementing and validating DISA STIG and CIS security baselines.

• Familiarity with ACAS, Nessus, or equivalent vulnerability scanning technologies.

• Experience with infrastructure automation tools such as Ansible, Terraform, or equivalent technologies.

• Experience supporting large-scale Linux deployments, virtualization platforms, and enterprise infrastructure.

• Familiarity with Linux performance tuning, system optimization, and advanced troubleshooting.

• Experience coordinating technical escalations with enterprise Linux vendors.

• RHCSA, RHCE, LPIC-2, LPIC-3, or equivalent professional certifications. Ideal Candidate The ideal candidate is a highly capable Linux systems engineer with deep Ubuntu production experience, strong cybersecurity knowledge, and the ability to independently resolve complex technical challenges. This individual should demonstrate technical leadership, a proactive approach to system reliability and security, and the ability to coordinate effectively with internal teams and external engineering resources in support of mission-critical infrastructure. Benefits Medical, Dental, Vision, Unlimited Vacation, Sick Leave, Paid Federal Holidays, Education and Certification Reimbursement Program, 401(k) retirement plan with safe harbor employer match after 3 months, Prepaid Legal Plan and Identity Protection Plan available, Accident Insurance, Critical Illness Insurance, and Hospital Indemnity Insurance available. EEOC Statement IPSecure does not discriminate based on race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

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