I liked the article. I think another point to bring up is that if you're interviewing a developer / technical co-founder and you yourself are not coming from that background, it might be a a good idea (at least from my own personal experience) to have a friend who's technical who's opinion you trust with you during some of those meetings to give you an objective and external view on things. I think there's a chance that might help you make a better, or at least a slightly more informed decision. Just my two cents..

Yeah, there's no startup without friends ... I have the same issue with designers.