> I was brought in for an iOS app development job interview

> A couple of the interviewers said they weren't too familiar with Objective-C either, so I clearly wasn't getting interviewed by their iOS teams.

Google's onboarding process is such an enigma to me. I went through a few of the remote interviews for SWE a few years back (I didn't commit to an on-site one in mountain view though). It seemed very odd to me that, near as I could tell, they don't really give an indication about what you would be working on until after you are hired and oriented.