We didn't say anything about technology stack: we host on Heroku using Sinatra and Ruby, Backbone.js, HAML,CoffeScript is used for frontend, the awesome Firebas

We didn't say anything about technology stack: we host on Heroku using Sinatra and Ruby, Backbone.js, HAML,CoffeScript is used for frontend, the awesome Firebase for real-time communication with backend workers, which run on AWS/written in Python using Sox.