Deploy Ember.js app with Express backend and MongoDB on Heroku

Am trying to deploy an Ember app with an Express API backend and MongoDB to heroku. I use the Ember REST adapter to communicate with the Express API. I run ember server and npm start in separate terminals to get my app to work. Everything works smoothly except I have to deploy it to Heroku. The ember app and the express app are in two separate folders in one git repository. What is the right way to deploy all this to single Heroku instance such that it just works. Am new to all of this so I haven't been able to figure it out. Any tips or example architectures are welcome.