You might want to look into Exponent. They're a YC startup that build a framework on top of React Native. https://getexponent.com/

The team is made up of a few React core devs and some ex-FB folks. They actually helped organize the last official React conf. The scope of what can be built using Exponent is expanding rapidly. And you can build apps that are virtually indistinguishable from Swift/Java apps.

If you want an example, I'd encourage you to download the Android version of this app: https://li.st/