btw, Ukraine’s Diia (дія) app is pretty good too and mostly open source (both backend and frontend components are fully open source, but document microservices which directly contact govt registeies in order to fetch the data are kept proprietary; they would be useless without proper authorization anyway though)

it also provides seamless authorization using managed keypairs (i.e. instead of using your own hardware keys to sign electronic documents, you can just use the app, which also provides a convinient oauth-like flow. Signing up for a bank account literally turns into a single tap, a face scan, and providing e.g. salary info etc)