The best solution would be to hire a local company in a tech-savvy city (Silicon Valley, Austin, London, etc) where ample technology expertise is available. This can be expensive though. So choose a Silicon Valley mobile app development company that has local Project Managers and UX experts who understand the market and U.S enforceable contracts to protect your IP, with offshore development offices. This will ensure that you never have to deal with headaches that come with language barriers, time zones, and inexperience but will still receive the lowest cost possible - i.e the best of both worlds.