A lot of big companies (FAANG) do test platform domain knowledge, many also do platform-specific coding sessions. The reason why interviews aren't solely compos

A lot of big companies (FAANG) do test platform domain knowledge, many also do platform-specific coding sessions. The reason why interviews aren't solely composed of platform questions, is that they want some measure of how good you'll be overall too. Many engineers at big companies end up changing roles entirely (android -> iOS, iOS -> backend, engineer -> engineer manager, engineer -> PM, backend -> ML, etc). Big companies don't just want someone who's knowledgeable about a single platform, they want someone who's also a skilled critical thinker and are able to break down hard/complex problems.