How do I judge a good developer on solo learn?

Question

XP is good. but someone with long duration may not be a good coder

I find number of codes good way to follow someone.

Answer 1

And again, number of codes does not guarantee code quality.

Answer 2

Must to be a real way to check owner of code

Answer 3

Look at their code awesomeness.
XP is not a good scale. Example: Me!

Answer 4

Find people that solve crashes or other problems in q&a posts. They are definitely worthy of following.

Answer 5

what else u suggest??