It appears that they have really good toolings so they can focus on hiring really smart new grads and giving them a lot of leeway on choosing what to work on without worrying about how productive they will be. One particular memorable response when the CEO Liang was asked about not using KPI goes roughly like this: since we all reviewd and worked with the candidate, if he is not productive it must be our fault to not have given him the right support to make him productive.