Mobile - iOS

IOS developer with 4 years of experience would typically have proficiency in the following areas:

1. Design and build applications for the iOS platform.
2. Proficiency with Swift and ObjectiveC programming languages.
3. Knowledge of iOS frameworks such as Core Data Core Animation etc.
4. Understanding of Apples design principles and interface guidelines.
5. Proficiency in code versioning tools including Mercurial Git and SVN.
6. Familiarity with continuous integration (Xcode Server Jenkins etc.)
7. Experience with iOS architectures (MVC MVVM Viper etc.)
8. Experience with UIKit SwiftUI or both.
9. Understanding of clean code and principles (SOLID DRY KISS YAGNI).
10. Experience with testing frameworks and automation testing.
11. Experience with thirdparty libraries and APIs.
12. Understanding of the full mobile development life cycle.
13. Experience in publishing apps on the App Store.

The more experienced developers would also have experience in leading projects making architectural decisions and possibly managing a team of other developers. Hope this information helps!