I always liked code written by Jersey team - https://github.com/jersey/jersey https://github.com/jersey/jersey. It is clean and legible. Though it is Java (not

I always liked code written by Jersey team - https://github.com/jersey/jersey https://github.com/jersey/jersey. It is clean and legible. Though it is Java (not Ruby as your question mentions) IMHO The concept of "Clean code" is language independent.