Varias red flags con lo que el op sugiere, por mencionar algunas:
“As soon as my client pays me, I’ll pay you.”
This client is running a shell game. They hired you to do work that they were hired to do themselves, and they don’t even have the level of success to front the cash until they get paid. In my experience, you will probably get paid, but it’ll take forever, and you don’t want to hitch your wagon to this dud of a star in the long run.
“I just need someone to build it.”
Usually accompanies the “next big thing” red flag. This client thinks that coming up with “Facebook for pets” was the hard part, and building and growing it will be trivial. They just need a code monkey to knock it out over the weekend, is that so much to ask?!