A Java Servlet developer is essential for designing and maintaining complex web applications. They bring skills in Java, JSP, and Servlets that help in building robust, secure, and scalable server-side applications. They can manage the interaction between a browser and a server, manage sessions, and ensure smooth user experiences. Their knowledge of databases and data management can be crucial for your business operations. Additionally, their understanding of various Java frameworks simplifies the development process, saving time and resources. Hiring a Java Servlet developer can thus significantly enhance the functionality and efficiency of your web applications.