A jQuery developer can enhance your website's functionality and user experience efficiently. They can create dynamic, interactive elements, from simple animations to complex features like AJAX forms or sliders. This can improve your site's usability, engagement, and overall aesthetics. They also ensure your website runs smoothly across different browsers and devices. Moreover, jQuery, being a simplified version of JavaScript, allows faster development process, saving you time and resources. Their expertise in jQuery can contribute significantly to your digital presence and business goals.