I can confirm that the claim "you can't even use a language other than Java" is completely false. Java is often the best tool for the job because of how much in

I can confirm that the claim "you can't even use a language other than Java" is completely false. Java is often the best tool for the job because of how much institutional inertia there is behind it, but certainly nobody will stop a team from using a better tool. PHP is banned at Amazon, and that's the exception that proves the rule: a language being banned is so unusual that I'm aware specifically of the example of PHP.