There were two rounds of interviews. First round is behavioral and second round is a case study. They are both back to back and each one is 45 minutes long.

Two parts and then you'll get a email a few days later if you receive an offer. Typical behavioral interview but one tip is that you should study Wayfair's core work principles. Case study, be prepared to make some sort of calculation and think out loud. It's helpful to write out your solution. Also helps to think big picture, how does can this lead to make more money for the company, what is the goal of an advertisement, etc.