Hiring a Memcached developer can significantly enhance your web application's performance. They specialize in Memcached, an open-source, high-performance, distributed memory object caching system that accelerates dynamic web applications by reducing database load. The developer can efficiently cache frequently used data, resulting in faster access to crucial information and improved user experience. They can also handle session caching and load balancing, ensuring a smoother and quicker server response. Their expertise can help optimize your application's performance, reducing server costs and increasing overall efficiency.