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November 11, 2025
Building AI Agents in Kotlin – Part 1: A Minimal Coding Agent
Building agents is weird. You’re not writing code that does things. You’re writing code that gives an LLM the ability to do things, and the LLM decides what to do. What is an agent? An agent is an LLM that calls your functions in a loop until it decides the task is complete. That shift […]
November 5, 2025
Growing Kotlin Adoption in Your Company
Guest post by Urs Peter, Senior Software Engineer and JetBrains-certified Kotlin Trainer. For readers who’d like a more structured way to build Kotlin skills, Urs also leads the Kotlin Upskill Program at Xebia Academy. This is the third post in The Ultimate Guide to Successfully Adopting Kotlin in a Java-Dominated Environment, a series that follows how […]
October 29, 2025
Finding Order in the Mayhem: A Novel Concurrency Testing Tool that Improved the Kotlin Compiler
If you’ve ever tried to track down a bug in concurrent programs, you know how chaotic and frustrating it can be: everything seems to work fine, then suddenly crashes, and you can’t quite pin down why – all while the bugs slip through. To bring order to this chaos, at JetBrains Research we built LitmusKt […]
October 28, 2025
Evaluating Kotlin in Real Projects
Guest post by Urs Peter, Senior Software Engineer and JetBrains-certified Kotlin Trainer. For readers who’d like a more structured way to build Kotlin skills, Urs also leads the Kotlin Upskill Program at Xebia Academy. This is the second post in The Ultimate Guide to Successfully Adopting Kotlin in a Java-Dominated Environment, a series that follows how […]
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.
Get startedBig, friendly and helpful community
Kotlin Foundation
