I was contacted via mail. A recruiter saw my LinkedIn profile. Over the phone, they asked a few basic iOS questions.

After that, I had another phone interview with "live coding." Again, there were some iOS questions, this time not so basic, and a few problems to solve in the editor.

At the end, I had an in-person interview with four different people. This mainly involved solving code problems on a whiteboard and a few general questions. One of the interviews was about architecture; that one was the toughest for me because I had never done something like that. In general, I had never experienced an interview process like this before.

I don't recall all the questions, but some of them had to do with general programming patterns and memory usage. The problems were mainly about knowing algorithms and complexity with Big O notation, and stuff like that.