Latest news
January 12, 2026
Advent of Code 2025 in Kotlin: Puzzles, Prizes, and Community
Thank you to everyone who participated in Advent of Code 2025 in Kotlin! Once again, it was a joy to see so many of you sharing solutions, cheering each other on in Slack, and keeping the holiday coding spirit alive. This year, we kicked things off with five days of livestreams on December 1–5, with […]
December 19, 2025
How Mobile Development Teams Use Kotlin in 2025: Insights From a Certified Trainer
This is the second guest post in a two-part series from José Luis González. José Luis has a PhD in software development and is a JetBrains-certified Kotlin Trainer, who works with developers and engineering teams to deepen their Kotlin skills and apply the language effectively in real projects. At Hyperskill, he runs Kotlin instructor-led training for […]
December 18, 2025
The Ultimate Guide to Successfully Adopting Kotlin in a Java-Dominated Environment
Adopting Kotlin in a Java-centric company is not about flipping a switch or rewriting everything “the right way”. It’s about people, timing, risk, and trust. Over the last four weeks, we’ve published a series of blog posts by Urs Peter, covering all of these aspects of migrating to Kotlin. In this post, we’ll tie the […]
December 17, 2025
Industry Leaders on the KotlinConf’25 Stage: What Global Brands Built With Kotlin
The Kotlin ecosystem continues to grow among the world’s most recognized brands, including Meta, AWS, Duolingo, Uber, and others. At KotlinConf 2025, these companies took the stage to share practical, real-world engineering stories. KotlinConf is where developers can learn directly from the teams building products at global scale. Software engineers showcase how they are tackling […]
fun main() {
val name = "stranger" // Declare your first variable
println("Hi, $name!") // ...and use it!
print("Current count:")
for (i in 0..10) { // Loop over a range from 0 to 10
print(" $i")
}
}Kotlin in action
Share code on your terms and for different platforms
Kotlin + AI
JetBrains is investing in AI models tailored for Kotlin, providing open data, benchmarks, and AI-native tooling integrated into your workflow.
At the same time, Kotlin makes it easy to build your own AI-powered features with seamless backend integrations and a growing ecosystem.
What you get with Kotlin + AI
- Strong support across JetBrains AI tools like AI Assistant and Junie
- Robust functionality for building AI-powered apps on the JVM
- Native integration with tools like Spring AI and LangChain4j
- Open data and benchmarks for better code generation
Build your own AI agents with Koog
Koog is JetBrains’ new Kotlin-native framework for creating powerful AI agents that run locally, interact with tools, and automate complex tasks. Whether you’re developing a simple chat assistant or an advanced multi-step workflow, Koog gives you full control with clean Kotlin code – no external services are required. Build, extend, and experiment with AI agents entirely in Kotlin.
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Kotlin Foundation
