Amazon Senior Software Engineer interview questions

round 1 asked a leaderboard design problem; the interviewer kept interrupting me when I was explaining my thought, so I had to keep rephrasing myself. also bq cost quite some time. round 2 asked a leetcode question. The interviewer was better than round 1, still spent tons of time on bq questions. round 3 asked a question called abusive words, which I saw exact same question on hack2hire so I got chance to prep before the interview. even with prep I still had to put some effort on edge cases. round 4 was sys design

What motivates you to go to this position?