The interview process began with a basic phone screen, followed by an hour-long engineering screen, and concluded with the "virtual" onsite interview.

The onsite interview featured an interesting format. It started with a 15-minute introductory interview, after which I was given a prompt to create an app within a couple of hours. A lunch break and check-in occurred around the halfway point. The interview concluded with a group session involving four engineers who reviewed my work and asked questions about it.

I signed an NDA, so I can't be specific, but it contained many of your generic iOS questions, with some deep dives into them.