An Apple Watch app developer designs, develops, tests, and updates applications specifically for Apple Watch devices. They utilize the watchOS platform and programming languages like Swift to create engaging, user-friendly apps. They must understand the device’s unique features, such as its compact screen size and health monitoring capabilities, to optimize user experience. They collaborate with UI/UX designers to ensure the app is aesthetically pleasing and functional. Additionally, they debug any issues, maintain the code, and ensure the app's compatibility with different watchOS versions. They may also analyze user feedback to improve app performance and functionality.