I applied online. The application included a non-trivial math/programming question that took me at least an hour.

I had one phone screen, followed by a coding assignment that took me a weekend. I implemented two approaches and documented both, although I only submitted the second.

After that, I had on-site interviews.

I participated in about five technical interviews during the on-site day. They were all pretty easy, except for one subtle algorithm problem where I came up with an O(n lg k) solution. The optimal solution was a tricky O(n), which I did not see until it was thoroughly explained to me. I believe this is one reason I didn't receive an offer.

The major reason I believe I didn't get an offer was that they seemed to want someone with more experience, even though they reviewed my resume. Most of the employees appeared to have PhDs or be older, but I had just graduated from undergrad, though I had been studying graduate-level ML material for months.

Most of the people who interviewed me were very nice and competent. One thing that annoyed me was that they informed me I didn't get an offer the day after the on-site interviews via the job application system, as if I had never advanced past the initial application stage. Consequently, I received no feedback.

The process was very fast. I just wished they hadn't wasted all of our time if they were looking for someone with more experience.

All technical questions. Mostly easy algorithms questions. I applied for an ML engineer position, but only one interview was on machine learning. It wasn't coding, and I didn't even have to write a single equation.