Next.js Storefront Node.js Backend Development

I already have a fully-functional storefront built with Next.js; what I now need is the server side that will let the shop go live. You’ll be looking at the existing front-end codebase, defining the API contracts it expects, and then building a clean Node.js backend that connects to MongoDB... (Budget: ₹1500 - ₹12500 INR, Jobs: AngularJS, API Development, Express JS, MongoDB, Next.js, Node.js, NoSQL Couch & Mongo, RESTful API)