Senior System Administrator for Migration and Modernization

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Job Title: Support System Administrator

Location: Austin, TX (Hybrid)

Interview Mode: Through Microsoft Teams

Position Overview

The Support System Administrator supports migration and modernization of end-of-life (EOL) systems, including legacy Windows Server (2012 and older) and Red Hat Enterprise Linux (RHEL 5/6/7). Focuses on upgrading to supported versions (Windows Server 2016/2019/2022/2025, RHEL 8/9) through reinstallation (primary) and in-place upgrades (last resort) to ensure security, performance, and operational continuity.

Key Responsibilities

System Assessment & Planning

• Assess legacy Windows Server (2012 and older) and RHEL 5/6/7 systems
• Prioritize migration based on criticality, security risks, operational needs
• Develop comprehensive migration strategy with risk assessments, upgrade paths, timelines
  
  

System Migration

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• Migrate legacy systems to RHEL 8/9, Windows Server 2022/2025 via reinstallation (primary method)
• Plan/execute in-place upgrades only as last resort following best practices
• Implement data backup/recovery strategies to minimize data loss
• Validate post-upgrade functionality (performance, application compatibility, services, networking)
  
  

Configuration Management

• Reconfigure system services/settings (networking, storage, security) post-upgrade
• Use Ansible (RHEL) and PowerShell (Windows) for consistent configurations
• Develop automation scripts for repetitive tasks across Windows/Linux systems
  
  

Security Enhancements

• Perform system hardening on RHEL/Windows per CIS Benchmarks/NIST standards
• Apply security patches/updates, bringing legacy systems to current levels

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• Run vulnerability scans, remediate issues during migration
• Ensure compliance with internal security policies/regulations
  
  

Troubleshooting & Support

• Escalate point for migration issues, especially legacy RHEL 5/6/Windows
• Provide post-migration support for system/performance/compatibility problems
• Troubleshoot OS-level and application issues ensuring high availability
  
  

Documentation & Reporting

• Document migration processes, configurations, issues/resolutions
• Update CMDB and TRP list with new OS/environment details
• Provide regular stakeholder progress reports on migration statmilestones
  
  

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Collaboration & Training

• Coordinate with networking, database admins, application owners, vendors
• Communicate downtime/changes to end-users/stakeholders
• Create user manuals, conduct knowledge transfer for updated systems
  
  

Backup & Disaster Recovery

• Implement backup solutions for Windows/RHEL systems
• Update/test disaster recovery plans post-migration
  
  

Candidate Skills And Qualifications

• 8+ years RHEL and Windows OS administration, upgrade, and migration experience.