No, Amazon structures its compensation such that you get a large cash "bonus" split up monthly over your first two years to offset the backloaded compensation. A senior (L6/SDE III) offer might look something like this:
160k base salary
350k sign-on (195k first year, 145k second year, split up monthly)
120 shares (@ 3720/share): 6 shares Y1, 18 shares Y2, 48 shares Y3 & Y4 (24 shares vesting every 6 months at that point)
So in the first year you're taking home 160k base salary + 16.25k bonus each month, none of which needs to be paid back if you leave.
