Hiring an Interface Builder developer is crucial for streamlining your app development process. They have expertise in designing user interfaces for iOS applications using Apple's Interface Builder tool. Their skills can help you create intuitive, user-friendly interfaces that enhance user experience, leading to increased user engagement and product success. They ensure that the app's design aligns with Apple's design guidelines, improving its chances of acceptance on the App Store. Furthermore, their knowledge in Auto Layout and Constraints ensures your app's interface is responsive across different devices, resulting in a wider audience reach.