React native is open source mobile application framework created by Facebook and community. React native are written in objective-c,Java,C++ and python. Different kinds of people are use react native and people are advanced ios developer to they have react beginners and those type of people who get started programming for the first time in their career.
The largest risk in react native is maturity, as the project still relatively young. Android support released in September 2015 and ios support released in march 2015. Some feature of Android and IOS still are not supported the community is still discovering best practices. React native is still young and the usual caution that go along with working new technology are apply here.