Have you launched an MVP yet? Minimum Viable Product. If not, I would get that done first.spend as little as possible. Get someone in Asia who works a lot cheaper and get a prototype.

If you have an MVP and are ready to have a finished product. Again, go to upwork or fivver. Find someone offshore who works for a few grand and gives you a kick ass product. There is usually no need for some company to do it for you. They’re usually hiring people form upwork anyway. Cut out the middleman.