We started from scratch in November 2010 and assembled a team of top developers, analysts and content specialists to open up the world of high quality article content from publishers all over the world, to people who did not have easy access to that content before.
Using the Lean Startup methodology, we quickly created a prototype, connecting to Summon, and launched with a beta in 2011.
Udini uses the following technology stack
I presented at Scala Days 2012 in London about the lessons learned with using Scala at Udini, you can see a recording from that presentation here