Google

Very challenging, but also extremely interesting. The interviews are not simply "question-answer," but an experience of joint problem-solving. You end up learning a lot and have the opportunity to discuss the company as well.

Contacted through email for an interview. Then took a technical test. After that, was contacted by the recruiter for three one-on-one phone interviews. Didn't get the offer due to not answering in too much detail technically.

Two coding interviews back to back. First round was easy. Second round was medium-hard LeetCode style. The result came right on the next day. No questions on the research projects.