[notahacker]

I think the idea that the person with the specialised knowledge of how to make hot sauce is the technical founder is an interesting point, but I think in YC/HN contexts it's usually considered to mean "engineer"; even in cases like accounting software where the founder who doesn't write software's specialised knowledge of the field is at least as critical as their partner's ability to convert that to code, the latter founder is the only "technical" one. Although tbh I don't think accountants or lawyers get offended by the insinuation they're the "non-technical founder".