Overall, a great experience.

Mostly interesting and passionate people who were not condescending.

Questions were difficult but solvable. 100% coding. Not a single question about background, projects, etc., even for a more experienced engineer.

Some interviewers, however, did not try to get the best from you and would simply say "okay" to anything you said.

In my case, I feel only one of the five interviews (the on-site) did not go very well. I had the correct algorithm and a correct implementation, but I was missing a subtlety in the implementation, which is my fault. Still, a hint or two would have been welcome. That was enough to not proceed further in the process.

Algorithms, data structures, system design,

... NDA prohibits sharing the actual questions.