This guy is obviously the most senior person in a small startup. To me personally, calling yourself a CTO with a CV entry that amounts to what an L5 in a FAANG

This guy is obviously the most senior person in a small startup. To me personally, calling yourself a CTO with a CV entry that amounts to what an L5 in a FAANG does in a half, is a bit ridiculous. What title would HN recommend for such a position, instead?