Amazon Manager Operations interview questions

The interview process was suprisingly disorganized. Very casual dress with the some interviewers in jeans. Pretty straightforward line of questioning except the math problem was not complex but very specific to their sort verbage and if you dont know the sort subsorts i.e. pickers, shippers, small package and multi package you dont understand that the pickers and shippers handle all packages. The actual math problem was no where near the example they gave as an example. Simple pwrs formula