A combination of different technologies makes it possible to have an eye on the rates of the most important precious metals. Users can define their own boundaries for notifications, push messages inform if the rates hit the boundaries on the way up or down.
The technical aspect of that was challenging. Data that changes in seconds, different resolutions of data that can be queried and all of that has to respond in milliseconds. The frontend has to work cross platform on iOS and Android while displaying the data neatly.