Just a small question. Aside from "find a problem and solve it" what are the methodologies to find viable statup product?
Like what did FB, Airbnb founders thought when they make those startups, did they think about their customer problems?
I'm interested in rigorous method to find viable Startup idea. (As rigorous as social science can be)
For background, I'm fullstack engineer (web,mobile mostly android,backend) in my early thirties trying to make a startup.(or should I find my co-founder first, some people do advise this one)