Craft CMS Upgrade Developer

We need a developer to upgrade our existing Craft CMS site from version: 2.9.2 to 4.5.1. The work includes updating the core system, reviewing and resolving any compatibility issues, and ensuring the site continues to function correctly after the upgrade. You should be comfortable working with an existing codebase, identifying potential issues, and making necessary adjustments to keep the site stable. Experience with similar CMS upgrades and troubleshooting post-deployment problems is important for this project.