I have received 2 OA for TikTok. I did quite badly on the first one but pretty sure very well done for the 2nd one. They were both similar 5 mcq's and 2 coding questions. However, I did not receive their interview for the next round.

3 tech rounds, 1 hour each. 30mins theory, 30mins leetcode style mediums. First interviewer asked me to share screen and solve the ques in my local IDE. Second and third interviewer sent a hackerrank link where they monitor your keystrokes and screen. Overall good experience but couldnt get the offer despite solving every technical question.