Kotlin by JetBrains
banner
kotlinlang.org
Kotlin by JetBrains
@kotlinlang.org
Kotlin is a programming language that makes coding concise, cross-platform, and fun — https://kotlinlang.org/

Video tutorials http://kotl.in/video
News http://kotl.in/news
Community discussions http://kotl.in/slack
💬 “The decision to adopt KMP three years ago has paid dividends in team growth, code quality, and business value. For teams considering a similar journey, our advice is simple: Start small, invest in your people, and be patient with the process.”

The Prezzee team
February 9, 2026 at 2:16 PM
🗳️ Help us understand how you use Exposed!

We’re running a short survey to learn how Exposed is used in real projects and where the experience can be improved.

⏱️ Just 5 minutes to make a big impact.

Take the survey 👉 https://surveys.jetbrains.com/s3/757c90830e4e
February 7, 2026 at 2:10 PM
Why Kotlin + Wasm, and why this combination is the future of web development 🕸️

Listen to the recent podcast episode with the Kotlin/Wasm team lead 👇
"Concise, multiplatform, and fun." 🤔 We're not just talking about Kotlin for Android anymore.

<a href="https://bsky.app/profile/did:plc:gpikd2oq5dz7pwhaq7fqkiaw" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky-mention">@bashorov.com from <a href="https://bsky.app/profile/did:plc:vlpfkxfmifnprfm3iyclckeq" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky-mention">@jetbrains.com joins the #WasmAssembly podcast to explore the next frontier: Kotlin/Wasm → goo.gle/4a2FqJs
February 6, 2026 at 4:35 PM
Kotlin is a great place to start your coding journey 🧑‍🏫
Check out our extensive free teaching materials: complete slide decks with lecture notes, assessments, and projects, ready to reuse or adapt. Explore the full range: https://kotlinlang.org/education/
Kotlin for Education
kotlinlang.org
February 6, 2026 at 2:14 PM
Reposted by Kotlin by JetBrains
Anna Kozlova, Technical Lead for the IntelliJ IDEA Kotlin Plugin at JetBrains, joins KotlinConf’26!

She’ll discuss how your Kotlin code can have a surprising impact on IDE performance, and how small changes in your code style can lead to noticeable improvements.

https://kotlinconf.com/#speakers
February 5, 2026 at 3:51 PM
Reposted by Kotlin by JetBrains
Who better to talk about Kotlin’s evolution than its Lead Language Designer?

At KotlinConf’26, Mikhail Zarečenskij from JetBrains will explore how Kotlin’s defaults around safety, mutability, and convenience evolve – and the trade-offs of design choices in a mature language.
February 3, 2026 at 4:07 PM
The Kotlin Foundation launches the Kotlin Ecosystem Mentorship program 🎉

Maintain a Kotlin open-source project? Help a newcomer make their first contribution!

• 30–60 min/week
• Feb 16 – Apr 16
• 10 pairs; one wins a KotlinConf26 trip

Apply to mentor: https://kotl.in/kemp-mentor
February 2, 2026 at 5:06 PM
And the winner of our #gotokotlinconf26 giveaway is… 🥁

🎉 @sometimesIcode_ – congratulations! 🎉

Thanks to everyone who shared their stories – we loved reading them.

See you all at KotlinConf 2026 in Munich! 🚀
January 30, 2026 at 6:14 PM
The Prezzee team shared how moving from native-only development to Kotlin Multiplatform helped them reduce duplication, move faster, and build a more collaborative mobile team.

Read the thread below for a short summary of their challenges, decisions, and key lessons 👇🧵
January 30, 2026 at 10:43 AM
Reposted by Kotlin by JetBrains
Reactive performance without the reactive pain.

Build fast, scalable Spring Boot apps with Kotlin coroutines and virtual threads – hands-on at KotlinConf.
🗓️ May 20 • 📍 Munich

Seats are limited – save your spot now 👇
https://kotl.in/spring-boot-workshop
January 29, 2026 at 4:26 PM
🌍 Golden Kodee for Positive Societal Impact

Using Kotlin for the greater good?

From accessibility to social innovation, we’re recognizing people who code to make the world a better place.

Nominate a contributor: https://kotl.in/golden-kodee-bl
Golden Kodee Community Awards | KotlinConf 2026, May 20–22, Munich
KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.
kotl.in
January 29, 2026 at 2:07 PM
⏳ There's only one day left!

Want a free KotlinConf 2026 ticket?

Tell us why you want to go using #gotokotlinconf26.

The winner will be announced on January 30 🎟️
January 28, 2026 at 2:57 PM
🎓 Golden Kodee for Education

Teachers, mentors, and trainers – this one’s for you! 💜

This award recognizes those who help others learn Kotlin in classrooms, universities, or workshops.

Submit a nomination: https://kotl.in/golden-kodee-bl
Golden Kodee Community Awards | KotlinConf 2026, May 20–22, Munich
KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.
kotl.in
January 27, 2026 at 3:48 PM
Reposted by Kotlin by JetBrains
Refactor Kotlin code from OO to functional – step by step, safely, and pragmatically.

Join our hands-on KotlinConf workshop 🧑‍💻👩‍💻
🗓️ May 20 • 📍 Munich

Seats are limited – save your spot now 👇
https://kotl.in/functional-worshop
January 27, 2026 at 11:31 AM
👥 Golden Kodee for In-Person Presence

Meetups. Talks. Workshops. Real-world impact.

This award celebrates the people who bring Kotlin to life through community events and connections.

Nominate yourself or a community contributor by February 22: https://kotl.in/golden-kodee-bl
Golden Kodee Community Awards | KotlinConf 2026, May 20–22, Munich
KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.
kotl.in
January 25, 2026 at 7:34 AM
Ktor 3.4.0 is out! 🎉

The release improves stability and brings new features:

🔶 Zstd compression
🔶 OkHttp duplex streaming
🔶 Structured concurrency for the HTTP request lifecycle
🔶 OpenAPI generation from code

Read the blog post for details ⬇️
https://kotl.in/n31gtm
Ktor 3.4.0 Is Now Available! | The Kotlin Blog
Ktor 3.4.0 is now available! It improves stability and addresses outstanding issues. Highlights include OpenAPI generation, Ztsd support for the compression plugin, duplex streaming for OkHttp, Struct...
kotl.in
January 23, 2026 at 6:43 PM
🎉 Exposed 1.0.0 has finally arrived, bringing:

🐙 R2DBC support
🐙 Stable API
🐙 Performance enhancements

Check out the blog post for the full details and migration guide 👇
https://kotl.in/7yl041
Exposed 1.0 Is Now Available | The Kotlin Blog
This is the first major release of Exposed – a huge milestone for both the project and the Exposed team! This release brings many new exciting features, the most requested being R2DBC support, as well...
kotl.in
January 23, 2026 at 4:43 PM
🌐 Golden Kodee for Online Presence

Creating tutorials, blogs, or videos that make Kotlin easier for others?

You – or someone you know – could be the first recipient of the Golden Kodee for Online Presence 🏆

https://kotl.in/golden-kodee-bl
Golden Kodee Community Awards | KotlinConf 2026, May 20–22, Munich
KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.
kotl.in
January 23, 2026 at 12:12 PM
🔥 KotlinConf’26 is just a few months away, and we’re excited to introduce the first round of speakers who will be joining us on stage.

👉 https://kotl.in/conf26speak-blu 👈
January 22, 2026 at 4:10 PM
Reposted by Kotlin by JetBrains
When you hear JPA, you think #Java. But what about #Kotlin?
This code looks correct, but a DB-generated ID changes after save() and entities disappear from HashSet/Map. Val and non-null types give false guarantees due to the reflection.
How to avoid it 👇
jb.gg/3cn6mp
January 21, 2026 at 12:15 PM
Reposted by Kotlin by JetBrains
Build AI agents in Kotlin 🤖

Get hands-on with Koog, JetBrains’ framework for production-ready AI agents, in a KotlinConf’26 workshop.

🗓️ May 20 📍 Munich 👇
https://kotl.in/ai-agents-workshop
January 22, 2026 at 11:50 AM
🆕 The Kotlin 2.3 what’s new video is out!

Learn from Márton (@zsmb.co) as he showcases the highlights of the new version, including language additions, features that became stable in this release, and improvements across all platforms 👇 https://youtu.be/_6PSSkqwbp8?si=EktCPcBGjmmhD7jK
What's New in Kotlin 2.3
YouTube video by Kotlin by JetBrains
youtu.be
January 21, 2026 at 6:08 PM
Updating Kotlin projects for Android Gradle plugin 9.0? 👀

We’ve put together a handy overview, which includes resources that you’ll need to update your existing projects.

👉 Read now: https://blog.jetbrains.com/kotlin/2026/01/update-your-projects-for-agp9/
Update your Kotlin projects for Android Gradle Plugin 9.0 | The Kotlin Blog
Learn how to migrate your projects to AGP 9.0 by moving to built-in Kotlin and the new Android KMP library plugin.
blog.jetbrains.com
January 21, 2026 at 3:45 PM
Want to go to KotlinConf 2026 in Munich?

We’re giving away 1 free ticket 🎟️

👉 Tell us why you’d go
👉 Share it on social media
👉 Use #gotokotlinconf26

📆 We'll announce the winner January 30.
Good luck! 🍀
January 21, 2026 at 1:27 PM
🎨 Golden Kodee for Creativity

From music and art to storytelling and design – we’re celebrating people who push the boundaries of what Kotlin can do.

Learn more about the new Kotlin awards ceremony: https://kotl.in/golden-kodee-bl
Golden Kodee Community Awards | KotlinConf 2026, May 20–22, Munich
KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.
kotl.in
January 20, 2026 at 4:23 PM