Feast or famine

HR and management don't work together at Amazon. HR tells you the official company policy (which also changes frequently) and management then completely goes against that with their own policies and goals and no one holds them accountable for breaking the official policy. There is lots of mandatory overtime during peak season (Black Friday through Christmas). After peak season has ended, there is a lot of down time, so employees are sent home without pay because there is not enough work to do. It's feast or famine all the time. There's literally no way to balance it out unless you have paid time off saved up and use some during peak to avoid being overworked and use some after peak to avoid not getting paid at all. 

The other problems from management are the promises of advancement as a reward for hard work. These are lies. You have to apply for promotions and then interview for them. You are competing with the rest of the FC employees and there is no fair judging of unbiased metrics to compare. Without direct support from your manager (usually only because your promotion will help his career too), you are pretty much denied the promotion every time. 

The FC works 22 hours a day on average throughout the year, so there is very little downtime for the equipment. This is the main reason it constantly breaks and then maintenance takes forever to the fix the problems. There are lots of equipment problems which go unrepaired for weeks at a time and this effects our ability to do our jobs well. There seems to be no communication at all between day and night shift maintenance. 

One reason Amazon probably doesn't care about all of these screwed up situations is that automation continues to grow and expand. You can almost sense the impending loss of your job when the managers figure out how to run the entire FC with the robots they keep using to take over more and more of the FC jobs.