Squire is an app for iPad that provides suggestions of movies and TV shows, based on the user’s preferences. There are also some social features, for instance a user can suggest a movie or TV show to one of his/her contacts.
We have developed the backend and web services that support the Squire iPad app. The recommendations system was written in Scala and everything else was developed in Ruby. This architecture tries to combine the best features of the different languages. The Ruby API is easy to maintain, while the recommendations engine written in Scala and Neo4j is powerful, fast and able to handle heavy computations in a reasonable time.