This is pretty awesome on both ends. Not only is it great that Mixpanel put so much trust in an intern in their first week but that Carl more than deserved that trust.

Now where do I find interns that good?

I wish more people would let their interns experiment & work on production code instead of forcing training periods of X months forcing them to read books and shudders answer tests.

...I doubled the number of tests in our suite to a healthy 101.

What good is half a test? ;)