Update Room Booking Site Platform

I am looking for an experienced developer to update my room booking website, which was developed with a theme four years ago. The goal is to upgrade the site to the latest versions of WordPress and MySQL while maintaining the current design layout and existing features.

Key Requirements:
- Update the existing theme to be compatible with the latest WordPress version
- Ensure MySQL database is updated to the latest version
- Maintain the current design layout and functionality
- Ensure all existing features are retained and fully operational post-update
- Conduct thorough testing to ensure seamless performance and security
- Migrate the existing data from the current site
- Ensure that custom changes made to the theme earlier are retained.
- Optimise the site for performance

Ideal Skills and Experience:
- Strong expertise in WordPress development and theme updates
- Experience with MySQL database management and upgrades
- Familiarity with maintaining and updating legacy systems
- Attention to detail and ability to ensure compatibility and functionality
- Good communication skills for discussing project progress and any potential issues

If you have the skills and experience to help bring my site up to date while preserving its current design and features, I'd love to hear from you!