Sunny is a full-stack developer with 20 years development experience. He is well experienced in web front-end development and back-end development and mobile apps development. Sunny has 12 years teaching experience in HKUSPACE and City University. Sunny has been teaching master programmes, undergraduate programmes, higher diploma programmes, associate degree programmes and evening short programmes. Courses he teaches include programming fundamental, web development, database application development, mobile apps development, multimedia production, UI/UX design, and digital marketing.