Hiring a Backbone developer can streamline your project by utilizing this lightweight JavaScript library. Backbone developers create client-side web applications and single-page applications in a structured manner. They bring organization to your code, separating business logic and user interface, which makes your application more maintainable and scalable. They can also provide efficient data syncing between your server and client. Working with a Backbone developer can ensure your application is robust, efficient, and highly interactive, enhancing user experience. They can also help in reducing page load time, improving your website's performance.