Andrew Ng isn't shy about the kind of engineer he refuses to hire, and he says the AI era is exposing exactly who's falling behind. The Stanford professor and Google Brain founder broke down what he sees as a hierarchy of engineering talent on an episode of the "20VC" podcast published Monday. The top performers are seasoned engineers who have adopted AI early and know how to leverage it effectively. "The most productive engineers I know, they're not fresh college grads," said Ng, who now leads