An iPhone/iPad Development Developer specializes in creating, testing, and updating software applications for Apple's iOS platform. They use programming languages like Swift and Objective-C to build user-friendly and functional apps. Their responsibilities include translating design ideas into code, integrating data storage solutions, ensuring the performance and quality of applications, fixing bugs, planning and implementing application functionality, and collaborating with cross-functional teams to define app features. They also need to comply with Apple's design principles and human interface guidelines, and prepare the app for submission to the App Store, ensuring it adheres to Apple's review guidelines.