Kotlin

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. …

Learn how OAuth2 and JWT work together to secure Spring Boot APIs with token validation, scopes, roles, and fine-grained access control.

Kotlin turns 15! Create a birthday postcard, share your wish, and explore more ways to celebrate the Kotlin Effect with the community.

Kotlin support is now available in BlueJ 6.0, helping educators teach introductory object-oriented programming with less boilerplate and ready-to-use classroom materials.

Golden Kodee finalists are out. Explore the latest Kotlin releases, new learning resources, JVM updates, and tools shaping the Kotlin ecosystem.

Starting from IntelliJ IDEA 2026.2, JetBrains will sunset Kotlin Notebook as a product and will no longer maintain it.

At KotlinConf’26, the JetBrains team and industry partners shared how Kotlin continues to evolve for developers at every scale.

Starting with Kotlin 2.4, the Kotlin standard library now includes an 18-month security support policy, with security fixes backported across active release lines.

A JetBrains Research study analyzing 28M development cycles found Kotlin cycles were about 15%–20% shorter than Java cycles on comparable work.

We’re trying to determine how well AI tools actually work with Kotlin. Take our 10-minute survey for a chance to win USD 50 Amazon Gift Card or six-month JetBrains All Products Pack subscription.

Kotlin is introducing new destructuring syntax. See what changes, why it matters, and how migration will work.

The Kotlin Foundation launched a mentorship program that paired experienced open-source maintainers with new Kotlin contributors to help them make their first meaningful contributions, with branded swag and a chance to win a trip to KotlinConf.