Overall process is very good, just a bit slow. Went through tech screen, then full virtual interviews, and offer. It took about 1.5 months. The questions are fair and domain specific. Interviewers are very nice and knowledgable.
But they do like to ask about value questions, which I think it's kind of unnecessary for engineering positions.
ML Research Engineer applicants have rated the interview process at Amazon Lab126 with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 46.1% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -