A book dedicated for Kotlin developers, helping to become better by writing safer, cleaner and more efficient code.

Best Practices

Effective Kotlin

A practical book dedicated to Kotlin coroutines, explaining built-in support, kotlinx.coroutines library and the best practices for real-life projects.

Deep Dive

Kotlin Coroutines

The book about advanced Kotlin features most of us use, but nearly nobody understands, like variance modifiers, property delegation, interface delegation, contracts, multiplatform development, annotation processing, KSP, compiler plugins, and static analyzers.

Advanced Kotlin

What functional features are offered in Kotlin, and how they are used in its amazing collections processing, DSL builders, scope functions and much more.

Functional Kotlin

This book covers the essentials of Kotlin so you can start developing with this amazing programming language.

Kotlin Essentials

Kotlin dla programistów

Książka pomagająca wejść w świat programowania od języka JavaScript. Zachęca i pokazuje jak uczyć się skutecznie.

JavaScript od podstaw

Książka pomagająca wejść w świat programowania od języka Python. Zachęca i pokazuje jak uczyć się skutecznie.

Our books

Effective Kotlin [EN]

Kotlin Coroutines [EN]

Advanced Kotlin [EN]

Functional Kotlin [EN]

Kotlin Essentials [EN]

Kotlin dla programistów [PL]

JavaScript od podstaw [PL]

Python od podstaw [PL]

Python з нуля [UA]