Hello. I can suggest you to google some software development companies that have the development team and ask them about their expertise and references. You can also organize a skype call with them, so you will be able to ask all your questions. Afterwards, they can send you the proposal with exact timings, conditions and description of what they can do for you. For examlpe, I have just simly typed: dedicated development team and have just found this one https://forbytes.com/dedicated-development-teams/ . Hope you wil find what you need!