Local Amazon-Style Marketplace App

I’m building a marketplace app for my region that mirrors the smooth, familiar shopping flow of Amazon while staying tightly focused on local sellers. The catalogue will launch with two core departments—Electronics and Clothing—and must feel ready to scale once the user base grows... (Budget: $30 - $250 USD, Jobs: API Development, Backend Development, eCommerce, iPhone, Mobile App Development, Payment Gateway Integration, PHP, UI / User Interface)