I applied through an employee referral. The process took 4 weeks. I interviewed at Blizzard Entertainment (Irvine, CA) in Mar 2013
Interview
The first interview was about knowledge of blizzard games and computers in general.
Since this is a localization position a knowledge in a second language is also needed and a written test will be required for a localization position.
The second interview will be a skype interview in which you'll get to answer questions by two members of their localization team.