This was my interview experience for TikTok frontend engineer in summer 2022. And I have a blog post for it. If you want to know the detail, you can check it out at https://explainthis.io/en/software-engineer-note/software-engineer-career/my-tiktok-frontend-interview

YOE: 2

First Round:
JavaScript & React & HTTP questions + 1 JavaScript whiteboard question

Second Round:
JavaScript & React frontend knowledge questions + 1 LeetCode Medium

Third Round:
1 LeetCode Medium + Frontend System Design + Frontend knowledge questions

Fourth Round (HR):
Several behavioral questions