Hiring a CoreData developer is beneficial for managing the model layer of your application. A CoreData developer can effectively organize data into a structured and efficient format, leverage iOS frameworks for data persistence, and improve app performance. They can also handle complex data manipulation tasks, manage object graphs, and ensure data integrity. Their expertise can greatly enhance the user experience by ensuring quick, seamless data retrieval and storage. With a CoreData developer, your app can be more robust, responsive, and user-friendly.