Coins of Russian Empire
This is a coin catalog I developed for one of my clients. The app is created using React Native. The catalog itself is stored inside the app. New versions of the catalog can be uploaded on the server and the app will download them. The images of coins are stored on the server. Server for this app works as a simple file storage, so there was no backend development in this project originally.
Later I had to develop a backend with Node.js to add a payment processor and email notifications. Now you can pay through the app to have your coin examined by experts.
I also wrote scripts for organizing and compiling the catalog. My client can now update the catalog without my help.