A Cocoa Touch developer specializes in creating applications for Apple's iOS devices, such as iPhones and iPads. They utilize the Cocoa Touch framework, a UI layer required to build iOS applications. The developer's responsibilities include designing and implementing application functionality, integrating with backend services, debugging and resolving issues, and ensuring performance and quality. They work with tools like Swift or Objective-C programming languages, and Xcode, Apple's development software. They also need to adhere to Apple's design principles and guidelines to provide a seamless and intuitive user experience. Ongoing learning about new technologies and updates to the framework is also part of their role.