there is a difference between a contractor and service provider. i found this out first hand. you don’t want to be a contractor because they will run you through HR and maybe an intermediary. tell them you only do this through a professional service agreement and that you have a corp and do not work through intermediaries. they can onboard you as a vendor. i do not understand why you also want to be employed at amazon. very unlikely to be able to negotiate that you can do consulting gigs on the side and want to keep your IP which you developed outside amazon.