I was contacted by a Google recruiter via email, who asked whether I was interested in participating in computer vision projects within Google. When I replied positively, the recruiter asked for an initial phone screen. We talked briefly over Google Hangouts, and he decided to waive my technical phone interview and bring me onsite directly.

I was asked to interpret a piece of code, which, according to the interviewer, required knowledge of the Z-transform in order to understand. I believe the reason behind this strange question is because the group I was interviewing with is Chrome Media, and they require a lot of signal processing techniques in their daily work.