Uber

Tough but fair. I thought it could have been more involved, but they seemed to have their ideal candidate in mind before the interview began. I would interview again for an engineering role.

It's a relatively long process and involves culture interviews. It has three rounds of interviews, some face-to-face and some through video. You will meet different kinds of personalities during the interviews, but they all stress culture.

Fair phone interview asked about quadtree encoding. Then they flew me up to Pittsburgh, where I met the team on campus. Small teams working on difficult problems.