HR phone screen -> two weeks later a phone call with hiring manager -> two weeks later got invited to onsite that lasted from 8AM - 3PM -> two weeks later another round of video tech interview on coding, ML, and optimization Overall experience is very pleasant. Loved the office. All the interviewers were friendly which sort of made me think that it was promising for me to get the job. However, I can see that the team wanted to test if my tech skills are solid enough by having the additional video interview, even tho I had already had a 7-hour onsite with 6 people including 2 DS, 1 software engineer, and 3 managers already. I did fine in the last round, not sure which part didn't impress the interviewer. The feedback was that my ML background is not strong enough. Well, I'm confident that my ML background is solid, their expectations are high surely.