An HTML Kickstart developer uses the HTML Kickstart toolkit to rapidly develop websites and web applications. This toolkit, based on HTML, CSS, and JavaScript, provides a set of pre-designed components like buttons, forms, navigation menus, sliders, and icons. The developer leverages these components to create functional, responsive, and consistent web interfaces quickly. They also manage browser compatibility issues, ensure mobile responsiveness, and perform testing. Additionally, they might customize these components as per the project's requirements. Their goal is to produce high-quality, user-friendly websites or applications efficiently, reducing development time and effort.