A Flinto for Mac developer designs and creates interactive and animated prototypes of app designs. They bring app designs to life by linking static screens together, adding transitions, and defining touch gestures. They also ensure the smooth flow of app interfaces. The developer utilizes Flinto's Behavior Designer to create micro-interactions within screens. They also make use of the video, scroll, and sound features to enrich the app experience. They work closely with UI/UX designers and developers to integrate the prototypes into final applications. Ultimately, their goal is to improve the user experience with engaging and intuitive app interfaces.