Thanks for the compliment! Rails backend, CoffeeScript / Backbone / Handlebars frontend, Postgres, Redis, Faye (for push messages). Sidekiq and Puma for multith

Thanks for the compliment! Rails backend, CoffeeScript / Backbone / Handlebars frontend, Postgres, Redis, Faye (for push messages). Sidekiq and Puma for multithreading. Hosted on Heroku. We've also got native iOS and Android apps.