Hiring a JPQL developer is beneficial as they specialize in Java Persistence Query Language, which is pivotal in managing relational data in Java applications. Their expertise ensures effective communication with databases, enabling seamless data manipulation and retrieval. They can develop complex queries, optimize database performance, and handle large data sets skillfully. Their knowledge in object-relational mapping (ORM) improves the maintainability and scalability of your application, providing a robust solution for your business. Thus, a JPQL developer can significantly enhance your Java application's efficiency, reliability, and data integrity.