How to distinguish the level of Junior from Middle in professional competence?

Differences between Junior and Middle developers in iOS usually manifest in the following aspects:

• Experience and knowledge: Junior is familiar with the basics of Swift/Objective-C, UIKit, and main patterns, while Middle confidently uses more complex concepts such as architectures (MVVM, VIPER), asynchronous programming, and optimization.

• Independence: Junior requires more mentorship and assistance, whereas Middle is capable of solving tasks independently, making technical decisions, and suggesting improvements.

• Code quality: Middle writes cleaner, maintainable, and testable code, understanding the importance of architecture and testing.

• Teamwork: Middle communicates better, participates in code reviews, and helps junior colleagues.

• Understanding of the application lifecycle: Middle has a deeper understanding of iOS operation, memory management, and performance optimization.

Example: A Junior can implement a screen based on a ready design and technical specifications, while a Middle can design the architecture of this screen, consider scalability and support, and integrate with network and database.