Valid technical questions. Really made sure you understood the technicalities of the job you applied to. Went really into depth and went on longer then anticipated. Interviewer was very knowledgeable,
First there was a phone screen with manager. Then you had to submit an essay and prepare an hour long technical presentation. Lastly, there was a panel interview with four people who asked various technical questions.
So far just a phone screen, but from what I know it's a three stage interview process.
Phone screening went well, interviewer was super nice. Just went over my resume and asked a few questions.