Professional Kotlin: Advanced Techniques

This book is not another introduction to Kotlin syntax. It is intended for those who already write in the language but want to reach a new level: master complex constructs, understand the internal mechanics of the compiler, and learn to build truly performant and reliable systems.

The author is Arseny Vetrov, a senior developer with 10 years of experience, a contributor to JetBrains open-source projects. The book collects real-world cases from commercial development: from build optimization to building DSLs for business logic.

What you will learn:

• Deep dive into coroutines: dispatchers, structured concurrency, channels, Flow, and exception handling in asynchronous code.
• Advanced type features: covariance, contravariance, inline classes, typealias, and safe sealed hierarchies.
• Creating DSLs: building flexible and readable domain-specific languages using lambdas with receivers, operators, and extension functions.
• Multithreading without pain: working with atomic variables, locks, thread pools, and the JVM memory model in the context of Kotlin.
• Architectural patterns: MVI, Clean Architecture, modularity, dependency injection (Koin/Kodein), and testing complex interactions.
• Functional style: monads (Either, Result), lazy evaluation, function composition, and memoization.
• Optimization and profiling: how to write code that doesn't lag — memory management, avoiding allocations, profiling with IntelliJ tools.

Who this book is for:

• Android developers transitioning to Kotlin Multiplatform.
• Backend engineers using Ktor or Spring with Kotlin.
• Those who want to write less boilerplate code and more business logic.
• Tech leads who want to introduce best practices and code review based on advanced language features into their team.

Each chapter contains practical, runnable examples and exercises with answers at the end of the book. You will learn not just to use Kotlin, but to think in the language's terms — efficiently, concisely, and safely.

The book is available on PythonLib in PDF and EPUB formats. After purchase, you will get access to a repository with the source code of all examples.