Middle android developer interview questions (Coroutines stack)

Below is a list of questions I asked in an interview for a middle developer. The concept of "Middle Developer" differs from company to company and even from project to project, therefore these questions may seem very complex to you, or vice versa, very simple for this position.

Each question has links to articles that contain the answer to the question and could be given to the developer if he/she is not answered the related question.

If you don't agree with this list or have suggestions on what to change/add to it, we can always discuss in the Discussions.

If you have a list of questions for a middle android developer that you want to share, please create a pull request, it's always welcome.

General

1. Describe SOLID principles

• SOLID Principles made easy
• SOLID Principles: Explanation and examples
• Kotlin SOLID Principles

2. What is the difference between composition and inheritance?

• Composition vs. Inheritance: How to Choose?
• A Composition Over Inheritance: A Powerful Design Principle
• Composition Over Inheritance In Kotlin Explained

Kotlin

3. Describe nullability and null safety

• Nullability in Java and Kotlin
• Null safety

4. What do you know about lateinit keyword?

• Kotlin lateinit (Late Initialization): Full Guide With Examples
• Kotlin lateinit: A Complete Guide to Mastering Late Initialization in Kotlin
• Lateinit and Lazy Property in Kotlin

5. What is the difference between nested class and inner class?

• Nested and inner classes
• Understanding Inner Classes and Nested Classes in Kotlin
• What is the purpose of inner class in kotlin?

6. What do you know about companion object

• Companion objects
• A true companion: exploring Kotlin’s companion objects

7. What do you know about sealed classes and interfaces?

• Sealed classes and interfaces
• Unlocking the Power of Sealed Classes in Kotlin: Design Patterns and Better Code Organization
• Kotlin Sealed Class (Examples, Uses, How to Use)

8. What do you know about functional interfaces?

• Functional (SAM) interfaces
• Everything you want to know about Functional interfaces in Kotlin

Coroutines

9. What are coroutines?

• Coroutines basics
• Kotlin coroutines on Android?

10. What's difference between launch and async?

• Start a coroutine
• What is the difference between launch/join and async/await in Kotlin coroutines

11. What do you know about Flow?

• Asynchronous Flow
• Kotlin flows on Android

Android

12. What is AndroidManifest?

• App manifest overview
• Android Manifest File in Android

13. What is Fragment?

• Fragments
• Fragments in Android

14. How to communicate with fragments?

• Communicate with fragments
• How to communicate between fragments in Android?

15. What's RecyclerView?

• Create dynamic lists with RecyclerView
• Customize a dynamic list

16. What is Jetpack Compose?

• Thinking in Compose
• Get started with Jetpack Compose

17. What do you know about android architecture components?

• Getting started with Android Jetpack
• What’s new in Jetpack?

18. What is ViewModel?

• ViewModel overview
• ViewModel
• ViewModels : A Simple Example

Architecture

19. What do you know about MVVM pattern?

• Model–view–viewmodel
• Introduction to Model View View Model (MVVM)
• MVVM (Model View ViewModel) Architecture Pattern in Android
• Android Architecture Patterns Part 3: Model-View-ViewModel

20. What is Dependency injection?

• Dependency injection
• Dependency Injection
• Dependency Injection
• Dependency injection in Android

21. What types of design patterns do you know?

• Software design pattern
• Design Patterns

22. What do you know about Builder pattern?

• Builder pattern
• Design Patterns: The Builder Pattern

Git

23. What is the difference between git rebase and git merge?

• Git Rebase vs. Merge: A Complete Guide
• Merging vs. Rebasing