Kotlin is a modern, expressive, and concise programming language popular among developers for its many benefits. These include its interoperability with Java, ability to build native mobile and web applications, and support for functional programming.

This book provides a comprehensive introduction to Kotlin, covering everything you need to know to start building Kotlin applications, regardless of your prior programming experience.

You'll start by learning the basics of Kotlin, including its variables, types, functions, and control flow statements. Then, you'll explore more advanced topics such as object-oriented programming, generics, coroutines, RxKotlin, and multiplatform development. Once you have a solid foundation in Kotlin, you'll learn how to use it to build real-world applications. You'll start with a simple Android application and then move on to more complex projects, such as a web application and a desktop application.

By the end of this book, you will have a deep understanding of Kotlin and be confident in your ability to use it to build robust, maintainable, and scalable applications.


  • Understand Kotlin fundamentals, such as syntax, type system, basic concepts, and reactive programming principles.
  • Learn to use Kotlin's advanced features, such as coroutines, extension functions, and generics, to write efficient, maintainable, and reusable code.
  • Explore applying reactive programming techniques to solve common challenges, such as handling concurrency, managing data streams, and building responsive user interfaces.
  • Seek guidance on how to build robust and scalable applications using Kotlin and reactive programming patterns, such as Spring Boot.


  • Learn Kotlin syntax, type system, and basic concepts to write idiomatic, expressive, and safe code.
  • Build robust and scalable applications using Kotlin, including web, mobile, and desktop applications. Use reactive patterns and frameworks such as Spring Boot to design highly scalable and resilient applications.
  • Apply best practices and design patterns to write maintainable and reusable code.
  • Write code that is reliable and easy to maintain.
  • Become a more productive and efficient programmer.


Building Kotlin Applications is for anyone who wants to learn how to build modern and scalable applications with Kotlin. Whether you are a software engineer, mobile developer, web developer, or student, this book will teach you everything you need to know to get started with Kotlin.