Speaking as someone who spends way to much time at SO:

If I'm looking to hire someone, their reputation on SO is not going to be a consideration. At all. Their rep on SO is going to tell me nothing about their work habits or their suitability to the job. For that, I'm going to look at their documented work experience and any products they have for review (web sites, open source projects, etc.) as well as their performance in an interview or series of interviews.

SO is a great resource, but not for screening potential hires.