Hello
Lately I'm very interested in AngularJS and even though I am a Java developer I've written two proof of concept apps with it at the company I'm working now. The results were great, it's a great framework, especially for testing. I used Jasmine and Karma runner for test, Grunt for build and a bunch of other angular modules (e.g. angular-auth) if you're interested to add this to your app. I also used Bootstrap which plays very nice with Angular.
Using MongoLab, I assume that all the application logic will reside in Angular. If that's the case I strongly suggest testing you Angular services, directives and controllers. I can help with that, as use Test Driven Development in my day to day work.
If you have any questions, don't hesitate to contact me.
Valentin IONITA