An iOS developer designs, develops, and maintains applications for iOS devices. They work with cross-functional teams to define, design, and ship new features. Their work includes not only production of application code, but also troubleshooting and resolving issues in the existing system. They ensure the performance, quality, and responsiveness of applications. They are also responsible for identifying and correcting bottlenecks, fixing bugs, and improving application performance. Moreover, they have to stay updated with the latest industry trends and technologies to incorporate new features into their applications. Their ultimate goal is to create engaging, user-friendly applications.