"Node.js and javascript all the way up from just above the services layer to the frontend layer" Sounds like a glorified web GUI layer. Good old statically-typ

"Node.js and javascript all the way up from just above the services layer to the frontend layer" Sounds like a glorified web GUI layer. Good old statically-typed Java is still used for the stuff that does the actual work. I propose a new article title "How PayPal switched to a more reasonable web GUI approach".