First it was a recruiter interview. General questions about the career, examples of challenges in previous projects. After that, a more technical interview were scheduled. Some general questions again, but more focusing on experiences, solving problems examples. Was very similar from the first one but with a little bit more technical questions, but ok.
The third one was the real technical interview, two engineers (one iOS and another one from Android) with technical questions, from the most basic to some deep understanding about iOS. After that, the Android engineer asked some questions about problems to be solved but thinking about the mobile view, not from iOS side. After that a live coding challenge, pretty standard (check if an array exists in another one)
The whole process was very fast, people were nice, but I believe they are seeking for some specific people that has some specific experience with the framework the app needs.