I applied online. I interviewed with the recruiter first who then set up another interview with two leads on the team. After talking with them I was given the chance to complete a rigging test.
I had two weeks to complete the test, but more time was offered if needed. Once I submitted the art test, after a few days I heard back asking if I could come interview in person at Blizzard HQ.
Blizzard flew me down to Irvine where I met with several members of the team during the onsite interview.