Hiring an Apache Derby developer is beneficial as they can leverage this lightweight, fully transactional SQL database engine for your applications. As it is Java-based, it integrates seamlessly with Java programs, promoting productivity and efficiency. The developer can utilize Derby's embedded architecture, reducing system complexity, thus improving stability. They can also leverage its standards-based security and data integrity features to protect your data. Moreover, they can exploit its capacity to operate in both embedded and server modes, providing flexibility to your projects. Overall, an Apache Derby developer can create robust, secure, and efficient database solutions.