The mobile app was implemented using React Native technology, the best solution for hybrid mobile development.
We chose a cost-effective implementation using React Native because we are able to write almost the same code for iOS and Android. As a result, we have to maintain less code which is great for easier and faster maintenance as well as flexible development as we can always implement components natively for iOS or Android. Parse Server is a BaaS solution perfect for mobile apps, accelerating development time and offering almost instant scalability. Parse Server on top of Heroku allows to scale up/scale down the infrastructure when needed.