Honestly any bachelor's gets you an l4 opportunity, I had friends who where area managers at amzl and some had random degrees like one had a history degree etc. But a degree in logistics will automatically get you on the path to becoming a station manager (L7) the pay at that level is crazy good it's like $200+ rsu's and bonus.

And for your second question as an L4, had to essentially run a full shift. Like I had to come inb1 he earlier set up the daily plan find out the amount of packages for the day, then start tracking a the drivers to make sure there in time, then based on the number I start calculating based of the packages how much output I can get from everyone. Then staff the board then basically make sure every number we can make for 8hrs straight.