Kotlin Application Architecture: From Basics to Production

The book "Kotlin Application Architecture" is a practical guide for developers who want to move from writing "working" code to creating professional, scalable, and easily maintainable systems. The author, Alexey Voronov, with over 10 years of experience in JVM and Kotlin development, shares proven architectural design approaches used in large commercial projects.

What is this book about?

The book covers the full cycle of architectural design for Kotlin applications: from choosing a project structure to implementing advanced patterns and integrating with modern frameworks. You will learn how to avoid common mistakes that lead to "architectural chaos" and technical debt.

Key topics:

• SOLID Principles and Clean Architecture — how to apply them in the context of Kotlin, leveraging language features (data classes, sealed classes, extension functions).
• MVVM and MVI — a detailed breakdown of popular architectural patterns for Android and server applications with implementation examples.
• Coroutines and Flow — organizing asynchronous interaction, lifecycle management, error handling, and testing concurrent code.
• Dependency Injection — manual injection vs Dagger/Hilt vs Koin: when and what to choose, how to design the dependency graph.
• Modularity and Multiplatform — splitting a project into feature modules, shared modules for KMP, version and dependency management.
• Architecture Testing — unit tests, integration tests, testing coroutines and ViewModel, mock objects, and fake repositories.

Who is this book for?

• Junior and Middle developers who want to systematize their knowledge and learn how to build architecture "from scratch."
• Senior developers looking for references and best practices for refactoring legacy projects.
• Team Leads who are implementing architectural standards in their team and want a single source of knowledge.

What will you learn after reading?

• How to properly decompose an application into layers and modules.
• How to design an API that doesn't "break" when requirements change.
• How to organize navigation and state management in complex screens.
• How to write testable code and not fear refactoring.
• How to use coroutines to build reactive and responsive interfaces.

The book contains numerous code examples, architectural diagrams, and practical exercises. All examples are written in modern Kotlin (1.9+) and are compatible with the latest versions of Android SDK and Ktor. This is not just a reference — it is a desktop book for everyone who wants to write professional Kotlin code.