Building Products at SoundCloud —Part I: Dealing with the MonolithJune 11th, 2014 by Phil Calçado Most of SoundCloud’s products are written in Scala, Clojure, or JRuby. This wasn’t always the case. Like other start-ups, SoundCloud was created as a single, monolithic Ruby on Rails application running on the MRI, Ruby’s official interpreter, and backed by memcached and MySQL. We affectionately call