Create a simple test to measure developers React Native knowledge

We are looking to hire a react native/node.js/mongo.db developer, your job here will be to assist us in creating a simple "test" that we can provide to those candidates in the future this way we can evaluate the proficiency in their react native / node.js/mongo.db knowledge. We are open to suggestions on how to structure this "test". Looking for something simple yet efficient, not something complex.