Right now I’m talking about the OA process. The questions are all from CodeSignal, and since CodeSignal has a question bank, there’s a high chance you’ll get a problem that has appeared before.
Interview questions [1]
Question 1
The first two questions are quite easy, while the last two are more challenging. It really helps if you’ve seen them before. One key difference from LeetCode is that the problems are usually much longer in description, and they rarely test dynamic programming.
I applied through an employee referral. The process took 4 weeks. I interviewed at TikTok in Jul 2025
Interview
There are four rounds, 3 technical rounds and 1 hiring manager round
1. Coding, 2 questions, medium level
2. Coding, 3 questions, 1 easy, 2 medium
3. System design, easy level
4. Hiring manager round
Interview questions [1]
Question 1
1. One BFS question and one DFS question (combination)
2. 3 consecutive questions, should use sorting and minheap
3. Design a Flink job which is working on sample joiner for 2 streams, one from prediction steam and user action data steam.
4. Questions about resume, project experiences deep dive, asked about ML/AI related projects (I don't hold during professional career)
I took the interview last month, and I was asked to solve several programming questions, including binary tree traversal and related algorithms. Although I completed the interview, I didn’t receive an offer in the end