Professional Kotlin: Advanced Techniques

The book "Professional Kotlin: Advanced Techniques" is not another introduction to syntax. It is a deep dive into the architecture and internal mechanisms of the language, intended for developers who already write confidently in Kotlin and want to move to the next level of mastery.

The author, Alexey Voronov, a senior developer with 10 years of experience in the JVM ecosystem, has gathered in one book the most complex and rarely covered topics: from the internal structure of coroutines to creating your own compiler plugins. Each chapter is built on the principle of "from problem to solution": first you encounter a real problem (e.g., memory leaks in coroutines or unreadable DSL), and then you analyze professional ways to solve it.

What you will learn:

• Coroutines under the hood: dispatchers, cancellation, structured concurrency, channels, and Flow. Learn to design asynchronous systems without race conditions and mutexes.
• Advanced DSL: how to build type-safe domain-specific languages using lambdas with receivers, invoke operators, and context functions.
• Reflection and metaprogramming: working with KClass, KFunction, KProperty, serialization without libraries, and dynamic proxies.
• Compiler plugins and code generation: creating your own annotations, handlers, and plugins for the Kotlin Compiler. Examples: automatic logger, null-safety validator.
• Performance optimization: inline functions, value classes, contracts, tailrec, as well as profiling and eliminating bottlenecks.
• Multithreading without pain: atomics, lock-free data structures, CoroutineScope and SupervisorJob for fault-tolerant applications.

Who this book is for:

• Backend developers using Kotlin (Spring, Ktor, http4k) who want to write high-load services.
• Android developers who want to master coroutines and Flow at an expert level.
• Architects and team leads designing multi-module projects from scratch.
• Library and framework developers — for creating your own DSLs and code generators.

At the end of each chapter — practical exercises and checklists for code reviews. After reading, you will be able to confidently: write your own coroutine wrappers, create type-safe builders, optimize bytecode, and automate routine tasks using metaprogramming.

The book "Professional Kotlin" will become your desktop reference for daily work. It doesn't teach "how," it teaches "why" — and that makes it indispensable for anyone who wants to write not just working, but elegant and performant code.