Hiring a Hibernate (JPA) developer is beneficial for managing large databases in your applications. They can efficiently map Java classes to database tables using Hibernate, making data manipulation and retrieval simpler and faster. Their expertise helps in maintaining data consistency, managing transactions, and improving application performance. They can also handle complex associations of databases, thereby enhancing the scalability of your application. Overall, a Hibernate developer will streamline your database management process, leading to increased productivity and reduced errors.