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 ...

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,...

Yuri Geronimus’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’t fully get it.  Neither would most engineers: if you understand the words in your application code, you build good syste...

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. Earl...

Starting with IntelliJ IDEA 2026.3 and Android Studio Rabbit 2 | 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 an...

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 not...

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 l...

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 “separate compilation” approach to KMP that solves both problems: make the compilation results co...

The Kotlin 2.4.20 release is out! Here are the main highlights: For the complete list of changes, see What’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 updat...

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.  Read on for the details, and check the release notes for the full list of changes and bug f...

Compose Multiplatform 1.12.0 is out! This version brings new tooling for AI assistants, improvements to web resource management, and finer control over desktop window states. Here are the highlights of this release: For a complete overview of the changes, check out What’s new in Compose Multiplatfor...

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.  Yet, the code might be invalid. The signing window might have closed. The database mi...

Explore a growing Kotlin Multiplatform catalog in your browser, or bring up-to-date library data directly into your AI development workflow through the klibs.io MCP server. When we introduced klibs.io in December 2024, the goal was simple: make it easier to find a Kotlin Multiplatform library that f...

Something is happening in server-rendered web development. React shipped Server Components. HTMX made “hypermedia” cool again. Phoenix LiveView proved a server can push interactive UI updates without a client framework in sight. Every ecosystem seems to be rediscovering the server as a place to rend...

JetBrains s’est associé à LinkedIn Learning pour proposer le certificat professionnel Kotlin. Il s’agit d’un parcours d’apprentissage structuré qui couvre l’ensemble du développement logiciel moderne, des fondamentaux de Kotlin à la création d’applications full-stack multiplateformes pour les enviro...

TL;DR: This post relates findings about language migration from the 2025 State of Developer Ecosystem survey. In general, project requirements are still the most common reasons for switching languages. One outlier from this trend, however, is Kotlin. People switch to Kotlin not because they have to;...

Hi everyone! July gave me plenty to celebrate: Kotlin turned 15, got its first public benchmark for AI coding agents, became available in BlueJ, and shipped its 2.4.10 release. Developers can also demonstrate their skills at RevenueCat Shipaton 2026 by building a Kotlin Multiplatform app and competi...

Somewhere in your notes there’s an app idea waiting for a free weekend that never comes. Consider this its official deadline: RevenueCat Shipaton 2026, the world’s biggest mobile hackathon, runs August 1 to September 30. If you know Kotlin, that idea is closer to the App Store than you think. The Sh...

Qodana 2026.2 makes it easier for development teams to act on code quality, security, and compliance findings throughout the development workflow. This release introduces clearer code coverage insights for pull requests, highlights uncovered new lines directly in the IDE, and automatically detects c...

This tutorial was written by an external contributor. APIs are frequent targets for bad actors since they expose data and functionality. Securing them while maintaining usability is often one of the most challenging and time-consuming parts of API development. OAuth 2.0 and JSON Web Tokens (JWT) hel...

TL;DR KotlinLLM is now public. It’s a research prototype for delegating runtime logic to an LLM from Kotlin code. Instead of calling an LLM on every request or running a separate agent, you can write an explicit Kotlin call. Its body is generated Kotlin source code, and that code is updated as your ...

エージェント型コーディングのベンチマークが実際のソフトウェア開発で身近になりつつあります。Kotlin チームにとっては、問題の解釈から検証に合格する解決策を生成するまでの一連の Kotlin タスクを AI エージェントがどれくらい確実に完了できるのか？というのが最大の疑問です。 当社はこの疑問を解決するための第一歩として、Kotlin のソフトウェアエンジニアリ�...

에이전틱 코딩 벤치마크가 실제 소프트웨어 개발 환경에 한층 가까워지고 있습니다. Kotlin 개발 팀에게 가장 중요한 질문은 AI 에이전트가 문제를 파악하는 단계부터 검증을 통과하는 해결책을 내는 단계까지, Kotlin 작업을 처음부터 끝까지 얼마나 안정적으로 수행할 수 있는가입니다. JetBrains는 이러한 답을 구하기 위한 첫걸음으로, Kotlin 소프트웨어 엔지니어링 작업에서 AI 코�...

Les benchmarks du développement piloté par des agents se rapprochent de plus en plus des conditions réelles du développement logiciel. Pour les équipes Kotlin, la question la plus importante est de savoir dans quelle mesure les agents d’IA peuvent réaliser des tâches Kotlin de bout en bout, de la le...

智能体化编码基准正逐步贴近真实软件开发。对于 Kotlin 团队而言，最重要的问题是 AI 智能体完成端到端 Kotlin 任务（从读取问题到生成可以通过验证的解决方案）的可靠性如何。 作为解决这一问题的第一步，我们发布了 Kotlin Benchmark，Kotlin Benchmark 是 JetBrains 用于评估 AI 编码智能体在处理 Kotlin 软件工程任务时表现的官方基准。我们的目标是为开发者提供一种可信、公开的方�...

🎉 Kotlin turns 15! 🎉 For 15 years, you’ve helped shape Kotlin into the language it is today. Whether you’ve built apps, contributed to the ecosystem, taught others, or simply chosen Kotlin for your next project – thank you for being part of the journey. Today, we’re celebrating Kotlin and the people...

A few years back, the Kotlin team figured it was time their programming language had a mascot – something fun and friendly to make developers feel more at home. After all, so many other programming languages have their own characters – Gofer, elePHPant, Dart’s Dash, or Rust’s Ferris, for example. Br...

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 addressi...

KotlinConf 2026 marked a milestone for the Kotlin community: the very first Golden Kodee Community Awards. The awards recognize the individuals and communities whose passion and dedication help the Kotlin ecosystem thrive. From creating educational content and building engaging online communities to...

Kotlin support is now available in BlueJ, one of the most established environments for teaching introductory object-oriented programming (OOP). This work is the result of a collaboration between JetBrains and the BlueJ team at King’s College London, including Professor Michael Kölling and Dr. Neil B...