Javascript:

- How does javascript scope works ?

- How does javascript hoisting works ?

- What are the es6 features ?

Misc:

- How is your git workflow for development and deployment ?

- Do you have any issues/experiences when team-working in a React Native project.

React:

- What are the differences between React and angularjs ? Which one do you prefer ?

- Why should we use state ?

React Native:

- What are the differences between React Native and PhoneGap / Ionic ?

- What should you prefer ? React Native or Native app or Hybrid app ?

- How to write a plugin for React Native ?

- How to build and deploy to Google Play ?

- How to build and deploy to Appstore ?

- How does React Native work (internal mechanism) ?