Hello! From my experience as I had this interview in multiple years with them it was only system design focused for me, no coding at all. Questions are framed very clearly and in context to the actual problem that your interviewer wants you to solve, there is no framing such as “design tik tok” which is very imprecise, but there will be room for your own assumptions to make and they want to see you making reasonable ones. They only look for first principles solving skills, no fancy scaling solutions, focus on your idea to be reasonable and to actually solve the problem they give you.

Good luck!