Submitted on their page; interviewed with the group leader directly for 1 round, no OA. Get pretty positive feedback from the interview. Get the job offer in about 4 days after the interview.

It was a WeChat audio interview, lasting about 30 minutes. The interviewer asked me some projects on my resume and asked for specific improvements I had achieved. In the end, there was a leetcode algorithm question, 3 sums, although I did not get the right answer.