Help in upgrading rails project

I am looking for a skilled developer to help me upgrade my Rails project from version 4 to version 6.

Requirements:
- Experience with Ruby on Rails, specifically upgrading projects from version 4 to version 6
- Strong understanding of the differences and challenges involved in the upgrade process
- Ability to ensure the project remains functional and all existing features are maintained after the upgrade

Skills and Expertise:
- Ruby on Rails
- Upgrading Rails projects
- Troubleshooting and debugging

Additional Information:
- No specific features need to be implemented after the upgrade, the main goal is just to upgrade the project to Rails 6.1