Some quick thoughts:
- If you have product, your first developer should at least be familiar with your technology stack. 2-3 years hands on experience should be a must imho. Avoid arguments like "He looks like a smart dude, he'll pick up things along the way"
- Not sure how it's done in your country but at least provide a tidy and accessible workspace, equipment of choice as well as insurance coverage. Not to mention a descent salary.
- You should look for someone who gets the job done. Not a crazy scientist, not someone who perfectly explains theories, not someone with a jaw-dropping CV. You need things done, within deadlines. Whatever things it might be, so yeah he should be able to get his hands dirty with various stuff not only the one, two things he mentions in his CV. But again, it's not sane to find the perfect generalist.
