It sounds like you are being given the opportunity to build someone else's Minimun Viable Product for free! And you would not even be getting founder part of ow

It sounds like you are being given the opportunity to build someone else's Minimun Viable Product for free! And you would not even be getting founder part of ownership. And who knows if the CTO position is still yours after funding. My biggest concern would be your boss(s). Do they joke about doing shady things before or in the future? Do they do drugs? Are they pathologically unable to talk about anything other than how much money this app/idea/business will make? Do they occasionally do dumb things like fund the start of the company by giving away 55% of the company in exchange for $300,000 from their soon the be ex-wife and her friends?