Kotlin Interview: 200 Questions and Answers

The book "Kotlin Interview: 200 Questions and Answers" is a comprehensive guide for anyone who wants to successfully pass a technical interview for a Kotlin developer position. It contains the most relevant questions asked in interviews at leading IT companies, along with detailed and structured answers that help not just memorize the material but also deeply understand the principles of the language.

The book covers all key topics:

• Kotlin Basics: data types, functions, classes, objects, null safety, extension functions.
• Functional Programming: lambdas, higher-order functions, collections, sequences.
• Coroutines and Asynchrony: CoroutineScope, launch, async, Dispatchers, Channel, Flow.
• OOP and Architecture: inheritance, interfaces, sealed classes, delegation, dependency injection.
• Android Development Features: Jetpack Compose, ViewModel, LiveData, Room, Retrofit.
• Testing and Tools: JUnit, MockK, Espresso, Gradle, CI/CD.

Each question is accompanied not only by the correct answer but also by explanations, code examples, and typical mistakes. This allows the reader not just to memorize cheat sheets but to form a systematic understanding of the Kotlin language and ecosystem.

Who is this book for?

• Junior developers — will gain fundamental knowledge and confidence in their first interviews.
• Middle developers — will systematize their experience and fill gaps in complex topics (coroutines, Flow, multithreading).
• Senior developers — will find questions for preparing for technical interviews for leadership positions.
• Team leads and HR — can use the book as a base for creating their own questions.

Special attention is paid to practical aspects: analysis of real-world cases, code optimization, working with legacy code, migration from Java to Kotlin. At the end of the book, you will find a self-assessment checklist and a list of recommended resources for further study.

The book is ideal both for self-study and for group sessions in courses or IT communities. Thanks to its clear structure (200 questions divided into 10 chapters), you can easily find the topic you need and review the material before an interview.

Don't leave your preparation until the last day — start studying Kotlin systematically today. With this book, you will be ready for any interview questions!