A Zurb developer experimenting with the Zurb framework is responsible for creating responsive and interactive web interfaces. They utilize Zurb's Foundation, a front-end framework that includes HTML, CSS, and JavaScript components. Their tasks include prototyping new ideas, testing web designs across different devices and browsers, and improving user experience. They may also customize the framework according to the project's needs, ensuring a seamless integration with other technologies. The developer is expected to stay updated with the latest advancements in Zurb and web design trends, implementing these into their development process for optimal results.