But for the purposes of that article, that's not how an open source developer is defined. Maybe in his last point, but we'll get to that. For the most part, it seems like he's just talking about the benefits you get from hiring, or even considering, someone who hacks on open source projects. Problem is, the article isn't very cogent. All of his benefits are generalizations, and either obviously true or wrong:
1. You can look at their code on the internets.
2. They can reverse engineer obfuscated, changing protocols.
3. They like to code.
4. They can upgrade httpd.
5. You're ... apparently also adopting whatever project they hack on. Huh?
If I'm hiring developers, though, I probably am going to look positively on folks that hack OSS.