Data Structures and Algorithms

Fortunately, unlike full stack engineers, the level of mobile enginners isn't as directly correlated to the difficulto of the data structures and algorithms questions. COmpnaies usually lay it easy because anecdotaly, mobile engineers do not prepare for dsa rounds like othre swes. However that doesn't mean you shouldn't expect difficult problems. The ones that give them usually have them tagged on leetcode. cough Duolingo.