I was notified of an initial email via email. I then had a phone interview with two different senior level members (30 minutes each). Both asked similar questions (your typical interview questions, i.e., tell me about yourself, client-facing experience, what do you know about Kayak). Very nice people.
Interview questions [1]
Question 1
There were no difficult questions other than "tell me about yourself", which is always a tricky one for many to answer.