Here are more details. dev 1. very slow, but solid. Need constant guidance to solve problems. However, can dig into boring/weird problems and reliable person.

Here are more details. dev 1. very slow, but solid. Need constant guidance to solve problems. However, can dig into boring/weird problems and reliable person. dev 2. distracted by interned and have problems with focus. Knows a little about many things, do many mistakes, but trying to improve. dev 3. was weak indeed from the beginning, but doing much better after several months. He is 31 and I don't think he will become great developer eventually.