Kotlin Application Architecture: From Basics to Production

The book "Kotlin Application Architecture" is a practical guide for developers who want to learn how to design and build reliable, scalable, and easily maintainable applications in Kotlin. The author, Maxim Voronov, with over 10 years of experience in JVM and Kotlin development, shares proven approaches and best practices that will help you transition from simply writing code to conscious architecture design.

What is this book about?

The book covers the full application development cycle — from choosing an architectural style to production deployment. You will learn how to apply SOLID principles, Clean Architecture, and Domain-Driven Design in the context of Kotlin. Special attention is given to modern approaches: coroutines for asynchrony, Flow for reactive streams, and lock-free multithreading.

• Fundamental principles: SOLID, KISS, DRY, YAGNI and their implementation in Kotlin.
• Architectural patterns: MVVM, MVI, Clean Architecture, hexagonal architecture.
• Working with coroutines and Flow: organizing concurrent execution, error handling, testing.
• DI and testing: dependency injection (Koin, Dagger/Hilt), unit and integration testing.
• Real-world cases: practical examples — from monolith to microservices, from Android to backend.

Who is this book for?

This book will be useful for:

• Java developers transitioning to Kotlin who want to deepen their understanding of its capabilities.
• Android developers looking to improve the architecture of their applications.
• Backend developers using Kotlin (Ktor, Spring Boot) striving to build reliable services.
• Team leads and architects seeking a systematic approach to design.

What will you learn after reading?

• How to choose an architecture for a specific task, rather than blindly following patterns.
• How to organize code so that it is easy to test and modify.
• How to effectively use coroutines and Flow for asynchronous operations.
• How to avoid common mistakes when designing application layers.
• How to introduce architectural decisions into an existing project without pain.

This book is not just a collection of theoretical concepts, but a practical guide with code examples, diagrams, and ready-made templates. You will be able to immediately apply the knowledge gained in your projects. Start building an architecture that will withstand the test of time and load growth!