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A concise multiplatform language developed by JetBrains

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Kodee’s Kotlin Roundup: Birthday Wishes, Shipaton 2026, and the New Kotlin AI Benchmark

Kodee

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 competing for the Ship Kotlin Everywhere Award. Meanwhile, X has rebuilt its Android app to be 100% Kotlin, marking another milestone for the language.

Here’s what stood out to me most over the past month:

Kodee-approved spotlight

Kotlin turned 15: Leave a birthday wish

This one is close to my heart – Kotlin recently turned 15! To mark the milestone, we’re inviting the whole community to celebrate. You can create a birthday postcard, upload a photo to party with me, and share a wish or a prediction for Kotlin’s next chapter. Now is the perfect moment to look back at how far we’ve come – and to look ahead together.

Join the celebration

Ship Kotlin Everywhere Award at RevenueCat Shipaton 2026

Already know Kotlin? RevenueCat Shipaton 2026 is the perfect opportunity to turn your Kotlin skills into a new app. From August 1 to September 30, build and ship for Android, iOS, desktop, or web and compete for the Ship Kotlin Everywhere Award. Use the KMP starter guide to get your project up and running. To earn bonus points, you can help others by sharing your development journey. Shipping is impressive, but helping someone else is even better.

Learn more and register

The Kotlin Benchmark for AI coding agents

Kotlin now has its very own public benchmark for AI coding agents. It ranks agents on 105 real engineering tasks drawn from open-source Kotlin repositories, so you can compare them by resolution rate, token cost, and latency – and dig into the methodology behind the numbers. As AI becomes a bigger part of coding in Kotlin, I love that we finally have an open, Kotlin-specific way to measure what actually works.

Explore the benchmark

Kotlin 2.4.10 and Kotlin 2.4.20-Beta2

July brought the Kotlin 2.4.10 bug fix release, alongside Kotlin Kotlin 2.4.20-Beta2 with coroutine stack trace recovery, faster klib compilation, expanded Swift export, and an experimental compiler native image. Try the Beta version and share your feedback while the release is still taking shape.

See the Kotlin 2.4.10 changelog

Kotlin comes to BlueJ

Kotlin support is now available in BlueJ 6.0 thanks to a collaboration between JetBrains and the BlueJ team at King’s College London. Students can create, edit, compile, and run Kotlin code, inspect class diagrams, and interact with objects through BlueJ’s familiar workflow. For educators, a new onboarding guide and ready-to-use materials make it easier to include Kotlin’s concise syntax and null safety in introductory object-oriented programming courses.

Read the post

A conversation with the Golden Kodee winners

The first Golden Kodee Community Awards recognized Matheus Leandro Ferreira, Jaewoong Eum, Nicole Terc, Eeva-Jonna Panula, and Yinlong Liu for their contributions to education, online presence, creativity, positive societal impact, and in-person community building. Read their interviews and watch the video to discover practical advice on learning in public, starting small, and helping the community grow.

Meet the Golden Kodee winners

Showcase your JetBrains IDE experience on LinkedIn

The free LinkedIn Connected Apps plugin lets you connect a supported JetBrains IDE to your LinkedIn profile. Once connected, a profile statement highlights how you use your IDE in practice, based on usage data that stays on your machine. As your development habits evolve, the statement updates automatically to reflect your experience. It is designed to showcase practical tool usage – not to rank developers or replace formal certification.

Connect your IDE to LinkedIn

How I came to life

I didn’t always look like this! My journey began with a simple robot-inspired concept. Then, with the help of research, creativity, and community feedback, I evolved into the Kodee you know and love today. Check out my origin story (including how I got my name!).

Discover the story behind Kodee

KMP library spotlight: Ktor, Koin, and Kermit

Finding the right KMP library shouldn’t slow down your project. klibs.io brings together more than 4,100 Kotlin Multiplatform libraries, with filters for developers and AI integrations that give coding agents access to accurate, up-to-date library data. This month, we’re spotlighting Ktor, Koin, and Kermit – a practical trio for networking, dependency injection, and logging.

Find your next KMP library

X rebuilds its Android app in 100% Kotlin

Built from scratch, X’s Android app is now written entirely in Kotlin. X Chat also uses Kotlin Multiplatform across Android, iOS, and web for end-to-end encryption, storage, sync, and business logic. It’s exciting to see Kotlin and Kotlin Multiplatform used at this scale.

Check out the rebuilt app

Where you can learn more

Learn how to use Navigation 3 in Compose Multiplatform.
Move a KMP project from CocoaPods to SwiftPM dependencies with help from Junie.
Connect your AI coding agent to klibs.io for up-to-date KMP library data.
Use Kotlin AI skills for common migration tasks.
KotlinLLM is Going Open Source.
Learn how to secure APIs built with Kotlin and Spring Boot using OAuth2 and JWT.
Build a task manager app with Kotlin, Spring Boot, and Claude Agent.
Explore Backend Development with Kotlin – presentation slides and a runnable demo project.
Listen to Sébastien Deleuze and Josh Long talk Kotlin for backend on A Bootiful Podcast.

YouTube highlights

Sony’s KMP Journey: Scaling BLE & Hardware with Kotlin Multiplatform | Sergio Carrilho.
What’s New in Compose Multiplatform | Sebastian Aigner and Márton Braun.
Run, Kotlin, Run! | Marc Reichelt.
A First Look at the Kotlin Ecosystem Plugin for Declarative Gradle | Marcin Mycek.
Building Enterprise Ready AI With Koog | Vadim Briliantov.
Real-World Data Science With Kotlin Notebook | Adele Carpenter.
Evolving Kotlin Language Defaults | Michail Zarečenskij.
Context Parameters and API Design | Alejandro Serrano Mena.
Concurrency Patterns for Modern High-Performance Kotlin Servers | Bowen Feng.
Deconstructing OkHttp | Jesse Wilson.

Kotlin Roundup News

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Know Kotlin? Ship It Everywhere and Win at Shipaton 2026

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. …

Ekaterina Petrova

Secure Your APIs: OAuth2 and JWT for Beginners

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

Alina Dolgikh

Kotlin Turns 15: Celebrate the Kotlin Effect

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

Kodee

In Conversation With the Golden Kodee Winners

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…

Jelena Ilic