TikTok Machine Learning Engineer interview questions

Applied for graduate start 2024 position through the website. Just finished first interview round, havent gotten an feedback yet. Overall, interviewer is very active in discussion on machine learning topics

OA after resume screening (for me the OA was generic (includes one rest API, 2 Algo problem, one SQL, one linux), some of my friends got very hard OA which assembles Math competition problems which may due to the positions they applied to), 1+ round of interview ( I got rejected on first round)