Hiring a GWT developer can greatly enhance your web application development. GWT (Google Web Toolkit) allows developers to create high-performance web applications using Java, without deep knowledge of front-end technologies. It ensures quick, complex, and maintainable applications with robust features like code reusability, easy debugging, and browser compatibility. GWT developers can provide a seamless user experience across various devices, improving your business's online presence. They can also help in reducing development time and cost, as GWT supports reusable components and automatic JavaScript generation.