A jQuery Mobile developer creates interactive and responsive mobile web applications. They utilize the jQuery Mobile framework, which is built on jQuery base, to design user-friendly interfaces that function seamlessly across various devices and platforms. Their work involves writing HTML, CSS, and JavaScript, leveraging jQuery Mobile's capabilities for touch events, theming, and AJAX-powered navigation. They also debug and optimize applications for performance and speed, ensuring compatibility with diverse mobile browsers. Furthermore, they may collaborate with other developers and designers, contribute to project planning, and stay updated with the latest trends in mobile web development.