Build a Collectibles Marketplace Website

I need a fully functional buy and sell website for collectibles. I have an existing site with some UI code, but it needs to be developed further.

The website should be built using the following technologies:
- HTML, CSS, JavaScript, JSON
- React, Node, Next
- MySQL, NoSQL
- Python

Key functionalities include:
- Users should be able to buy and sell collectibles easily.
- Support multiple transaction methods (to be discussed).
- Implement user roles: Buyer, Seller, Admin (to be detailed).

Ideal skills and experience:
- Strong background in web development with the specified technologies
- Experience in building e-commerce or marketplace platforms
- Knowledge of database management (both SQL and NoSQL)
- Familiarity with user authentication and role-based access control

Please provide examples of similar projects you've completed.