Preference is to hire managers externally vs. promoting from within. The incredibly difficult work-life balance takes high performing employees and burns them out until they have nothing left to give with little to no recognition or compensation. Promotions take a really long time and when transferring within teams there is very little chance to be promoted and starting all over again with a new manager within a lateral move, on a new team can take 1-2 years for promotion. Therefore, don't come to Amazon to build your career unless you're willing to put in a minimum of 3 years before being recognized.