Fizzbuzzer

A programmer, most likely a beginner who overly focused on meaningless optimization and code-golf, often in exotic languages, instead of real-world practical programs in mainstream languages.

Robert: "Look, I spent the whole night rewriting my fizzbuzz program in clojure, not it runs 0.54% faster!"
Andrew: "Cool, I wrote a RESTful API for my food delivery startup"
Robert: "pffh, a CRUD, how boring"
Andrew: "Whatever Fizzbuzzer"

Robert: "It was a lot of hard work, but I managed to reduce memory usage in our webapp by 200mb average"
Andrew: "It was a internal usage webapp, who cares, RAM is $20 per GB but you wasted 20 labour hours worth $500"
Robert: "..."