Echoing jacquesm and especially wpietri, the last time I can remember signing an NDA for an interview, the company actually had a MVP and customers, the MVP was

Echoing jacquesm and especially wpietri, the last time I can remember signing an NDA for an interview, the company actually had a MVP and customers, the MVP was being crushed by the load (the company provided services and used the MVP internally to produce those, so it wasn't a super crisis yet). I was hired to help improve the MVP, and do all the things a 2nd technical type might do. The company before that, though, had a great idea, but their policy of total secrecy before launch, and fear of getting crushed by immediate load, delayed their launch past a point where they could survive. Although in that case they were creative people.