The whole process was very unprofessional. They They were so arrogant and did not respect the candidate. They were asking to write the formula of the sigmoid function. SQL questions like highest salard, I answered it correctly because I have done it many time and later ran it and it was correct but the interviewer insisting that is not a correct answer.

It is a loop interview spanning several days. You can negotiate with the recruiter to adjust the 4-round interviews. They are hiring manager round, BQ round, coding round and deep dive technical interview. Coding round is more practical and research-based, instead of leetcode. Deep dive will cover basics of ML and deep learning, and a bit of LLM if related.