A Google Gadget developer creates and maintains small applications that can be embedded on web pages and accessed via the Google Gadgets platform. These gadgets can range from simple games or tools to more complex applications that provide real-time information or allow users to interact with each other. As a developer, you will need to have a good understanding of how the Google Gadgets platform works in order to create effective gadgets. In addition, you will need to be able to design and develop your gadget using HTML, CSS, and JavaScript.