I work at Amazon, I interview a lot, in fact I teach an internal course for conducting interviews. What you experienced is 100% against our policies, and what we teach interviewers.
You don't give candidates negative feedback like that.
And you never ever EVER end an interview loop early. EVER. You finish the day. You collect as much data as you can. And you let the recruiters reject candidates if and only if everyone has submitted their feedback into an internal tool (without being able to see other people's feedback first), and then discussed it.
I kind of want to see if I can reach out to you another way to find out your info so that I can find what bar raiser/hiring manager you had and have a word with him.
I am curious on your choice to post this on a throwaway account. From the details - works in AWS, interviews a lot, teaches internal course for conducting interviews I would imagine that it would be easy for people within AWS to reasonably guess your identity.
Amazon has 150,000 employees. Granted most of those aren't in IT, but it's a pretty big place. Take a look at all the services they provide, and think about what it takes to deploy and support them. Their cloud computing As-A-Service effort offers load balancers, SQL clusters, VMs, archive/backup storage, DNS, network topologies, AV transcoding, Hadoop, machine learning, etc. Each of those paid offerings has a develop, test, deploy and maintain effort associated with it, as well as effort to maintain the authentication & authorization components, and provide consistent user interfaces across technology designed by a plethora of vendors.
When you factor in management overhead and unreleased products, it seems like a few thousand is reasonable.
And you never ever EVER end an interview loop early. EVER. You finish the day. You collect as much data as you can. And you let the recruiters reject candidates if and only if everyone has submitted their feedback into an internal tool (without being able to see other people's feedback first), and then discussed it.
I kind of want to see if I can reach out to you another way to find out your info so that I can find what bar raiser/hiring manager you had and have a word with him.