TikTok Software Engineer interview questions

Frustrating. First interview was fine, but the second was awful. Got questioned about front-end concepts even though I was applying for a back-end role. Interviewer refused to let me code when I tried to build out a structure to understand the design for the problem. Awful

The first step is the online assesment from hacker rank. It was 4 questions. Personaly the difficulty might be medium and hard and the time is the 2 hours. I really don't remember it.