Abstract: Today, there is a growing interest in web-based management system all over the world and also systems have a great importance to the academic institutes. In this sense, web-based management system is greatly concerned in the Advanced Technological Institute (ATI) community functioning under the Sri Lanka Institute of Advanced Technological Education (SLIATE). Focus of this study is to design and implement a web-based management system which automates ATI management system of Galle. Due to the inefficiency of the current manual system, the need arises to automate web-based ATI management system in order to efficiently handle processes currently take place.