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Google Summer of Code 2026 has wrapped up! This was the Kotlin Foundation’s fourth year participating in GSoC, bringing new contributors into the Kotlin open source ecosystem through hands on projects and mentorship. This year, two projects successfully reached completion, tackling two areas of the ecosystem:…
The KotlinConf 2027 Call for Papers is now open! We invite developers from across the Kotlin community to bring their ideas, experiences, and expertise to the stage in Kraków. Do you have a Kotlin lesson or discovery that could help other developers? Perhaps you solved a difficult technical problem, introduced Kotlin…
Yuri Geronimus& 8217;s four year old son once asked him what his job was. Yuri told him he writes books: books that describe what he wants to change in the physical world. His son didn& 8217;t fully get it.& 160; Neither would most engineers: if you understand the words in your application code, you build good…
The Kotlin Toolchain is a unified entry point into Kotlin. It lets you build JVM, Android, iOS, multiplatform, and server side applications with a simple declarative configuration. With the release of v0.13, we now recommend the Kotlin Toolchain for most new Kotlin Multiplatform (KMP) projects. Earlier this year, we…
Starting with IntelliJ IDEA 2026.3 and Android Studio Rabbit 2 & 124; 2026.2.2, we’re discontinuing Swift language IDE features in the Kotlin Multiplatform (KMP) plugin. This includes editing, syntax highlighting, and navigation within Swift files and between Swift and Kotlin. Running iOS applications and debugging…
We are working on extensions to our companions mechanism to unlock new code patterns and improve interoperability across different platforms. This post outlines these new features and provides preliminary guidance on migration. Companion blocks and extensions Many programming languages provide a notion of class or…
In 2026, Kotlin turned fifteen. Over those fifteen years, Kotlin has built a mature ecosystem, been adopted by companies around the world, and established a large and active developer community. Fifteen years is long enough to understand which technology trends lasted and which didn’t. This report looks back at…
The current compilation approach to Kotlin Multiplatform projects works, but sometimes can lead to unexpected or hard to predict behavior. For example: With Kotlin 2.5.0 Beta1, we introduced an optional & 8220;separate compilation& 8221; approach to KMP that solves both problems: make the compilation results…
The Kotlin 2.4.20 release is out! Here are the main highlights: For the complete list of changes, see What& 8217;s new in Kotlin 2.4.20 or the release notes on GitHub. How to install Kotlin 2.4.20 The latest version of Kotlin is included in the latest versions of IntelliJ IDEA and Android Studio. To update to the [&…
Kotlin Toolchain 0.12.0 is out. This release brings some long awaited features: multiplatform libraries publication, a preview of Wasm application support, Compose Hot Reload from the command line, and more.& 160; Read on for the details, and check the release notes for the full list of changes and bug fixes.…
Here’s a function that signs a document: In Kotlin, Unit means the function completes without returning a meaningful value – roughly equivalent to void in Java. Got it? Now, tell me what could go wrong. You can’t.& 160; Yet, the code might be invalid. The signing window might have closed. The database might be down.…
The new release of JetBrains Air brings support for GitHub Copilot, OpenCode, Pi, Cline, and other ACP compatible agents. It also adds IntelliJ powered navigation and diagnostics for Java and Kotlin and runs Windows tasks in Docker containers. Try Air for Mac, Linux and Windows Bring your own agents and harnesses Air…
Agentic coding benchmarks are getting closer to real world software development. For Kotlin teams, the most important question is how reliably AI agents can complete end to end Kotlin tasks, from reading an issue to producing a solution that passes validation. We’re taking the first step in addressing that gap by…
