Today is exciting: we’ve completed a year-long project to move Groupon’s web traffic from our legacy Ruby on Rails application to Node.js. We’ve been working hard on this transition and have learned a lot along the way. Groupon will be one of the largest production deploys of Node.js worldwide. We’re currently serving ~50,000rpm and our overall response times have dropped dramatically. Over the next few months we’ll be releasing the libraries we used to power our new Node.js platform and we will be blogging stories about this intense transition.