• Serve as a technical lead and subject matter expert for the RHEL 7 to RHEL 9 migration project. • Develop migration strategies, including in-place upgrades, new builds, and application re-platforming. • Actively partner with application owners to assess application compatibility with RHEL 9, identify dependencies, and develop test plans. • Provide hands-on support to application teams during migration, troubleshooting package, library, and configuration-related issues. • Manage the day-to-day operations of the RHEL 7, 8, and 9 server fleet, including provisioning, configuration, and decommissioning. • Develop and maintain automation solutions using Ansible, Bash, or Python for patching, configuration management, and system builds. • Manage RHEL subscriptions, repositories, and patching lifecycles using Red Hat Satellite. • Perform system hardening and ensure compliance with federal security standards (NIST, FISMA, and DISA STIGs). • Serve as a senior escalation point for all Linux-related incidents, performing advanced troubleshooting and root cause analysis. • Monitor system performance, capacity, and health, implementing proactive measures to ensure stability. • Create and maintain comprehensive documentation, including system diagrams, build guides, and standard operating procedures (SOPs). • Participate in an on-call rotation for 24/7/365 operational support.