iOS developers typically need proficiency in at least one of the two primary iOS programming languages, Swift or Objective-C. Familiarity with development tools like Xcode, Interface Builder, and various frameworks is also crucial. Some jobs may demand specific skills or experience, like server-side programming or working with third-party APIs. Having a portfolio showcasing your app projects or contributions can help you stand out in the job market. In addition, some employers may look for formal education in Computer Science or related fields, but that's not always a strict requirement.