The few skills that are transferable across the whole industry are a tiny part of what it takes to do many jobs, especially more senior IC roles. There is no certification that is possible.
I think you vastly overestimate the skills that are necessary for most jobs.
Also, it should be noted that Amazon and Google don't interview for specific jobs -- they interview you for a job at the company and then you get placed. That would imply that at least at Google and Amazon, the skills are transferable across everything they do.
