I want to create a small web app with the following features:

• Menu: view, add to order/cart
• View and update order list
• Scan QR to go to each table’s order (different QR for each table)
  All of this is live so the order will be past to the admin and updated in real time like you’re ordering food in a restaurant.

I’m a beginner web dev with some experience using the MERN Stack. I want to know which addition services/technologies I should be using to achieve this.

I haven’t tried making one yet, so I still want to explore and ask for opinions first before diving in.

Thanks in advance!