Hiring an ASP.NET AJAX developer can significantly enhance your web application's performance and user experience. These developers are skilled in creating interactive, fast, and dynamic web pages. They can handle multiple tasks such as server-side programming, database management, and front-end development. With ASP.NET AJAX, they can reduce the load on the server, making your website more efficient. They can also implement real-time features and build robust and scalable applications, helping your business to grow and stay competitive. Their problem-solving skills and technical expertise can provide innovative solutions tailored to your needs.