Php version change and some modifications in yii

I am in need of a developer to help me with a project that involves changing the PHP version from 7.1 to 8.0, as well as implementing some new features in the Yii framework. I need these modifications done within a week. The ideal candidate should have experience in PHP and Yii framework, and be able to work quickly and efficiently to meet the deadline. Specific requirements include:

- Upgrading PHP version from 7.1 to 8
- Implementing new features in Yii framework
- Ensuring that the modifications do not break existing functionality
- Testing and debugging the code
- Providing documentation and support as needed.