The back-loaded vesting schedule is such blatantly cynical bullshit. It shows that they're planning to overwork you, push you to wash out, and undercompensate you for the experience, which is exactly what I've seen happen to a good number of friends. Amazon has become
notorious here in Seattle - everyone knows they're a burnout factory. Some people make it through, and they make good money, but you have to
really care about money for that to be worth the effort.
I had an Amazon interview loop on the calendar during my recent job search, a couple of months back, but it was difficult to get excited; they think so very highly of themselves, for what they're offering - and I don't just mean the money, but the culture too. They treat you like an interchangeable wage slave, not like a respected professional; it's all hoops to jump through, and procedures to memorize - dance, monkey, dance!
The recruiter was shocked when I cancelled the rest of the interviews, like, aren't you even going to give us a chance? But no: I had received a good offer from an ambitious, well-organized, well-funded AI startup which was excited to have me on board. With that on the table, why would I put up with Amazon? They won't offer better pay, they can't offer a better culture, and they don't have more interesting problems to work on.