On a side note, my brother works at Duolingo and wrote an article detailing a very similar migration (from Python to Scala) here: http://making.duolingo.com/rew

On a side note, my brother works at Duolingo and wrote an article detailing a very similar migration (from Python to Scala) here: http://making.duolingo.com/rewriting-duolingos-engine-in-scala http://making.duolingo.com/rewriting-duolingos-engine-in-sca... and lists very similar reasons for the switch.