Hour-long technical phone interview with a developer on the team. Worked through a problem on Hacker Rank in the coding language of my choice. At the end, I was asked to talk through a couple of systems design questions in very abstract terms.

There are several HRs taking care of different interviewing and recruiting process. They are very responsible, kind and lovely. They usually respond quick and will help to solve any problem arise. My HR also brought snacks for me when I was doing my onsite interview. It is a very comfortable, effective and wonderful interviewing experience with Zillow.