Mastering Android Kotlin: Junior vs Mid vs Senior — 5 Practical Code Examples

When writing Android code with Kotlin, your experience level often shines through your style, structure, and problem-solving approach. In this article, we’ll walk through 5 common scenarios and compare how a Junior, Mid, and Senior developer might tackle each one.

Whether you’re starting out or aiming to refine your skills, these side-by-side examples will help you level up. Let’s dive in! 👇

Android Developer

Example 1: Loading Data in a Fragment

Scenario: Load and display userModel from ViewModel .

🎓 Junior:

viewModel.userModel.observe(viewLifecycleOwner) {
    textView.text = it.name
}

🧑‍💻 Mid:

viewModel.userModel.observe(viewLifecycleOwner) { user ->
    user?.let {
        textView.text = it.name
    }
}

🧙 Senior:

lifecycleScope.launchWhenStarted {
    viewModel.userModel
        .filterNotNull()
        .collect { user ->
            textView.text = user.name
        }
}

Example 2: Making a Network Request with Retrofit

🎓 Junior:

val call = api.getUser()
call.enqueue(object …