Shopify Auction Platform

I need a developer to build a custom auction system for my Shopify store. Users should be able to bid without creating a Shopify account, using phone/WhatsApp OTP verification instead. The system must handle live bidding, outbid notifications, auction closing, winner selection, and then send the winner a unique link to buy the product at the exact winning price through normal Shopify cart and checkout. We may use an external auction engine for the bidding backend.