My Employment +, Drew map from pdf file using core graphics iOS framework, base on the apple map framework. +, Implemented searching from one place to another place or current position, using Dijkstra algorithm. +, Implemented voice over internet protocol function by using Asterisk on iOS. +, Built a real-time chat system based on eJabberd. +, Implemented chat module, including text, emoticon, image, record on iOS. +, Integrated image filters using openCV and implemented image processing like crop, rotate, focus, blur on iOS. +, Blocked unwanted messages and phones on jailbreak iPhone by using hook and reserve technique. +, Implemented contact backup and restore, lock device or make a sound via message. +, Analyzed and wrote code to detect and remove some kind of malware, trojans, virus. +, Top 5 in class, out of over 200.