Since you have your application ready to be deployed, there is a huge flexibility in options. But the most popular deployment solutions from Google, Amazon, and Microsoft tend to involve a lot more setup and usually the attachment of billing/credit card information. Instead, we suggest using a simpler platform as a service (PaaS) called Heroku, to deploy our backend app. Once you have an account you can push straight to Heroku, or deploy from your GitHub repository directly to Heroku. If this doesn't work for you, a public web server will do.