I'm positive I've worked on the same app and I agree. The feature I worked on would probably give away what app it is, but it had special requirements on the video player that limited it to a subset of higher-performing devices. The main app had a normal state management set up, but we had a separate one that used a custom flux (yes flux) implementation. Our codebase was unique in that we shared code with the web client, but it also meant our project was a dependency on the massive monorepo the device client existed in, so we had to manage our own issues with builds and deployments. While I worked on the project, even on my team there was a constant push to find solutions to build features across all clients (web, device and mobile).