I have started and run a few successful bitcoin casinos, and offered consulting services for a couple other (e.g. first csgo crash casino I helped made >1M USD in the first month after launch). (Go through my profile for more information).

I offer consulting services starting from 1 BTC. That would be something like ~5 hours of my time, going over pretty high level stuff. I am happy stubbing out some prototype code (.e.g. game concept maths, risk management) but I would not be writing any production code (i.e. you need your own dev team).