I recently worked as a volunteer for a startup, where I built a ride sharing app. Specifically, I built the backend on Firebase and the frontend in Flutter/Dart. It was a challenging project, where I worked on 4 apps simultaneously - rider and driver apps on both Android and iOS.
I released a fully functional alpha version to Google's playstore. The code is proprietary and is not available. Below is a snapshot of the app. The demo video is available here or clicking on the image below
Left: Rider app running on iPhone XR Right: Driver app running on Google Pixel 3a