How to create a scalable Node.js app with MongoDB Atlas for trip assignment with multiple users?

Hi, I’m trying to create an app in Node.js that allows users to assign trips to drivers. The app should be scalable to allow any user to register as an administrator of their own travel company. I want to use MongoDB Atlas as the database, and I’m looking for information on how to make my app multi-user. Is there any documentation or online tutorial that can help me understand how to set up my app to be scalable with multiple users in MongoDB Atlas?