An iTunes developer is responsible for creating, testing, and updating apps for Apple's App Store. They utilize programming languages like Swift or Objective-C, and tools such as Xcode to develop applications. They also ensure that the apps adhere to Apple's design and interface guidelines. Their work includes integrating APIs, fixing bugs, and improving app performance. Additionally, they engage with the user community for feedback, implement necessary changes, and manage app release processes. They also stay updated with the latest technological trends to create innovative and user-friendly apps. Their ultimate goal is to enhance user experience and satisfaction.