A system and method for building a client application in a client-server network are disclosed. One system includes an HTML file that is requested from a server. An infrastructure script file is requested from the server based on a reference in the header section of the HTML file, and an infrastructure class instance is created. In the body section of the HTML file, the infrastructure class instance creates component instances based on one or more calls in the HTML file. To create the component instances, the infrastructure class instance first loads the component class script files from the server, and creates and links the component classes based on the component class scripts. Component instances are then created based on the linked component classes to thereby form the application.