Amazon Software Development Engineer II interview questions

Was contacted by company recruiter and proposed to take part in hiring event. When accepted had some very basic phone call with the same recruiter to do a quick technical background review. After this was asked to complete online test on HackerRank. After passed it was contacted by logistics crew to arrange transfer to place where hiring event was going. Overall interview on event took around 4 hours and was done by 4 different interviewers one after another.