Wow! This is simply the best article I have gone through to produce a full fledged chat application. The backend techs are simply awesome with use of Docker, Express, Apollo, graphQL, and mongoose DB. The stepwise explanation of backend implementation with code snippets are very helpful. Then, bridging the gap between the frontend and backend using GraphQL configuration in React Native app is simple awesome work. The UI implementation is simple and explained properly. The use of the subscription feature of GraphQL is what we can take away from here. We can use these awesome backend techs in some highly rated React Native Chat app templates out there which are highly customisable to our needs.