[Backand]

The cool thing about MEAN is as a front-end developer you have the ability to trace all the way down the stack without having to learn another programming language (JavaScript) but it works primarily with MongoDB. Similar to Firebase is Backand.com which also provides you a REST API but to any database, which means you can work with your own MySQL or Postgres database. Unlike Firebase, Backand gives you a bunch of AngularJS UI directives to begin with so that it makes getting started very simple. Another technology is PhoneGap which can make your Angular web app into mobile apps using standardized web APIs.