New Kotlin Standard: What Awaits Developers in 2025

Online Python Trainer for Beginners

Learn Python easily without overwhelming theory. Solve practical tasks with automatic checking, get hints in Russian, and write code directly in your browser — no installation required.

Start Course

New Kotlin Standard: What Awaits Developers

The JetBrains team has officially unveiled a long-awaited update to the Kotlin programming language, which many experts have already called a "new standard" for modern development. The release includes both fundamental changes in the compiler and new capabilities for multiplatform development, making Kotlin an even more attractive choice for backend, mobile applications, and the web.

Key Innovations of Kotlin 2.x

The new standard is based on the stable version of Kotlin 2.0, which brought with it the revolutionary K2 compiler. Here are the main changes awaiting developers:

K2 Compiler: A completely rewritten compiler backend provides a 2-3 times performance boost at the build stage. For large projects, this means reducing compilation time from minutes to seconds.
Improved Type System: The new version eliminates a number of old bugs related to type inference, especially when working with generics and nullable types. Developers now get more predictable code behavior.
Stability of Kotlin Multiplatform (KMP): KMP has finally achieved Stable status. Now you can safely use the same code for Android, iOS, server-side (Ktor), and web interfaces (Kotlin/JS).
New Language Features: Context parameters have been introduced, along with improved support for value classes and extended syntax for sealed hierarchies.

What Does This Mean for Developers?

For those already using Kotlin, the update primarily means speed and reliability. For beginners, it lowers the entry barrier: the new compiler provides clearer error messages and offers automatic fixes directly in the IDE. Additionally, JetBrains announced full integration with Gradle 8.x, simplifying build configuration.

Special attention should be paid to multiplatform capabilities. Previously, a shared codebase for Android and iOS was more experimental. Now, according to JetBrains, major companies like Netflix and Uber are already using KMP in production, confirming the technology's maturity.

Prospects and Ecosystem

The new Kotlin standard also implies active development of libraries. In the near future, an updated version of Ktor 3.0 with improved support for HTTP/3 and WebSockets is expected, as well as the release of Jetpack Compose for desktop (Windows, macOS, Linux), which promises to become a full-fledged alternative to Electron.

For web developers, it is important to note that Kotlin/JS is now fully compatible with modern frameworks like React, and the performance of compiled JavaScript code has approached native levels.

How to Migrate to the New Standard?

The transition is quite simple:

Update the Kotlin plugin in IntelliJ IDEA or Android Studio to version 2.0+.
In the build.gradle.kts file, change the Kotlin version to 2.0.21 (or the current stable version).
Run the migration analyzer — it will automatically find and fix outdated constructs.

JetBrains guarantees backward compatibility: all code written in Kotlin 1.9 will work without changes.

The new Kotlin standard marks a transition from a "language