Finding public parking spaces in Melbourne CBD sometimes get harder. I always wanted to build an app that helps me find a parking space easily. Then I realised its an interesting real-time data processing use case. Data Stream A: Melbourne city council exposes parking lot updates through a REST API. The data is updated every 2 mins. Data Stream B: The driver’s current GPS location(Latitude, Longtitude) in real-time. Basically my car will be streaming LAT, LON as I keep moving.