Just the First round: OA. 2 coding problems and 10 multi-choice machine learning basic questions. The difficulty is just fine. As long as you have studied machine learning systematically, you can solve most of them. I got a positive feedback via the email from HR next day, so now I am waiting for the next round.

Talk about the project first. Ask some machine learning questions basic but in detail and not so easy to answer Coding challenge online about a prefix question (Trie tree) need to analysis time complexity