The very first interview is a technical interview where they give you three tasks to solve on Hackerrank. If you have not trained to solve this kind of olympiad programming task - you screwed. A brute-force approach does not count - you have to find an optimal solution (where the complexity is O(n*ln(n)) or even O(n).

There were 2 rounds of coding interviews and 2 rounds of ML/AI/CV interview. The questions from the coding interview are closely related to what ecopia is working, but can also be solved by common data structure / algorithm knowledge if you formulate the problem in the right way. For the first ML/AI/CV interview, I gave a presentation on my past experience for roughly an hour, discussed some questions around it. For the 2nd, the interviewer described a few problems computer vision problem ecopia has solved or is trying to solve, and then we discussed potential solutions around it. Overall, the interview questions are very reasonable and you can see how it is related to the company's technologies. The interviewers are trying understand what you are capable of.