I have developed and hosted a website on vercel(frontend),render(backend) and supbase(database).the link of the webiste is given below
https://dec2014.space/
the website takes a bit of time to respond from backend due to limited resources but all functionalities are working properly.If not working then u may inspect-network and if it shows 500 or cors then it is internal error otherwise it will be showing pending
the user can login either as supplier or builder and accordingly will be directed to different dashboard having different functionalities.
the builder can request for material and supplier can bid on it,the builder may choose one of the bids and succesfull bid will be notified to supplier and all other will be rejected and request will not be shown to other suppliers.