I need customisation on a PHP marketplace script

I need a PHP developer familiar with the Fir. A lightweight PHP MVC Framework. https://github.com/codefir/fir.

I have a marketplace script made by PHP, it works well, only problem is that it doesn't have a feature that I want.

It may take while to understand the code, I can provide a URL for a demo of the script so you get an understanding of what the website does.

- You will need to create a new page, that allows sellers to sell 'fixed services' like peopleperhour.com/services.