As an experienced iOS/iPhone/Android developer, I have been participating in a project that using map and core location service to detect and display user's current location; communicating with server through web-services; using core data to store data locally for faster and better performance; using core animation to perform complex animation; implementing complex custom UIView base on requirement; using push/remote notification to allow server to control user's device base on specific situation. I also implemented QRCode generator for iOS/Android platform, securing the communication layer between servers and devices, and managed resources concurrently. Summary: - Implemented client/server application model - Implemented custom UIView - Implemented QRCode generator - Implemented concurrent network connections - Implemented security layer for iOS/Android and server - Used core animation - Used core audio - Used core data - Used core location and KMap - Used push/remote notification