Applied through the website, got sent OA link on CodeSignal, didn't make it to the interviews. OA is 70 minutes for 10 questions, which is by a large margin not enough time to solve everything. It is fully proctored, i.e. they record your webcam and microphone, and you are supposed to be alone in the room - I don't think it was disclosed or obvious to me before I started the test. The test has 6 MCQs, 1 leetcode style problem, 2 "ml" problems, and 1 output-only problem. The "ml" problems are in the same style as ML homework in a college course - you're given code stubs and equations for missing parts, and you're expected to implement the missing parts. One of the silliest things in those assignments is that you're not allowed/supposed to use numpy. Weirdly enough, for those, you still can get TimeLimit exceeded on the Codesignal platform. The MCQs are super vague and unclear - despite being very knowledgeable in core ML, I wasn't sure if I answered those questions correctly.