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
Video tutorials http://kotl.in/video
News http://kotl.in/news
Community discussions http://kotl.in/slack
🎨 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
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
🎨 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
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
Reposted by Kotlin by JetBrains
Join this advanced Kotlin Multiplatform workshop at KotlinConf'26!
We'll cover code sharing, native integrations, Kotlin/Swift interop, performance, and quality.
🗓️ May 20 • 📍 Munich
Seats are limited – save your spot now! 👇
kotl.in/kmp-workshop
We'll cover code sharing, native integrations, Kotlin/Swift interop, performance, and quality.
🗓️ May 20 • 📍 Munich
Seats are limited – save your spot now! 👇
kotl.in/kmp-workshop
January 20, 2026 at 1:55 PM
Join this advanced Kotlin Multiplatform workshop at KotlinConf'26!
We'll cover code sharing, native integrations, Kotlin/Swift interop, performance, and quality.
🗓️ May 20 • 📍 Munich
Seats are limited – save your spot now! 👇
kotl.in/kmp-workshop
We'll cover code sharing, native integrations, Kotlin/Swift interop, performance, and quality.
🗓️ May 20 • 📍 Munich
Seats are limited – save your spot now! 👇
kotl.in/kmp-workshop
2025 was a standout year for Kotlin Multiplatform — now powering apps for millions worldwide.
📈 Adoption in top apps doubled YoY
🎨 81% of devs use Compose Multiplatform
🧰 Solid tooling on macOS, Windows & Linux
✅ Used in production at Google, Duolingo & Douyin
Thread 🧵👇
📈 Adoption in top apps doubled YoY
🎨 81% of devs use Compose Multiplatform
🧰 Solid tooling on macOS, Windows & Linux
✅ Used in production at Google, Duolingo & Douyin
Thread 🧵👇
January 16, 2026 at 12:18 PM
2025 was a standout year for Kotlin Multiplatform — now powering apps for millions worldwide.
📈 Adoption in top apps doubled YoY
🎨 81% of devs use Compose Multiplatform
🧰 Solid tooling on macOS, Windows & Linux
✅ Used in production at Google, Duolingo & Douyin
Thread 🧵👇
📈 Adoption in top apps doubled YoY
🎨 81% of devs use Compose Multiplatform
🧰 Solid tooling on macOS, Windows & Linux
✅ Used in production at Google, Duolingo & Douyin
Thread 🧵👇
Build once. Ship UI everywhere.
Level up with Compose Multiplatform at a hands-on KotlinConf workshop. 👇
kotl.in/cmp-workshop
Level up with Compose Multiplatform at a hands-on KotlinConf workshop. 👇
kotl.in/cmp-workshop
Compose Multiplatform workshop. KotlinConf 2026. Munich. 20th of May.
Join us there and learn everything you need to start building great cross-platform apps!
More details here: kotl.in/cmp-workshop
Join us there and learn everything you need to start building great cross-platform apps!
More details here: kotl.in/cmp-workshop
January 15, 2026 at 3:58 PM
Build once. Ship UI everywhere.
Level up with Compose Multiplatform at a hands-on KotlinConf workshop. 👇
kotl.in/cmp-workshop
Level up with Compose Multiplatform at a hands-on KotlinConf workshop. 👇
kotl.in/cmp-workshop
🏆 Update on the Golden Kodee Community Awards 🏆
We’ve heard your feedback! Nominations are now open for others, as well as yourself. Know someone who inspires the Kotlin community?
Give them a well-deserved shout-out 👉 https://kotl.in/golden-kodee-bl
We’ve heard your feedback! Nominations are now open for others, as well as yourself. Know someone who inspires the Kotlin community?
Give them a well-deserved shout-out 👉 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 15, 2026 at 3:54 PM
🏆 Update on the Golden Kodee Community Awards 🏆
We’ve heard your feedback! Nominations are now open for others, as well as yourself. Know someone who inspires the Kotlin community?
Give them a well-deserved shout-out 👉 https://kotl.in/golden-kodee-bl
We’ve heard your feedback! Nominations are now open for others, as well as yourself. Know someone who inspires the Kotlin community?
Give them a well-deserved shout-out 👉 https://kotl.in/golden-kodee-bl
Reposted by Kotlin by JetBrains
Software development is being transformed by AI. Let’s talk about it!
This is your invitation to join JetBrains for TransformConf 2026, on September 15–16, in London.
Subscribe to the newsletter and get your early bird discount: transformconf.ai
This is your invitation to join JetBrains for TransformConf 2026, on September 15–16, in London.
Subscribe to the newsletter and get your early bird discount: transformconf.ai
TransformConf 2026, September 15–16, London
TransformConf is a conference hosted by JetBrains focusing on how AI is transforming software development, end to end.
transformconf.ai
January 15, 2026 at 12:59 PM
Software development is being transformed by AI. Let’s talk about it!
This is your invitation to join JetBrains for TransformConf 2026, on September 15–16, in London.
Subscribe to the newsletter and get your early bird discount: transformconf.ai
This is your invitation to join JetBrains for TransformConf 2026, on September 15–16, in London.
Subscribe to the newsletter and get your early bird discount: transformconf.ai
Compose Hot Reload is now stable and bundled with Compose Multiplatform since v.1.10.0! 🎉
This deep dive by @sellmair.dev and Azat Abdullin walks through the engineering behind Compose Hot Reload and how it works under the hood.
For the curious among you 👀
https://kotl.in/hotreload100
This deep dive by @sellmair.dev and Azat Abdullin walks through the engineering behind Compose Hot Reload and how it works under the hood.
For the curious among you 👀
https://kotl.in/hotreload100
The Journey to Compose Hot Reload 1.0.0 | The Kotlin Blog
Compose Hot Reload has been promoted to stable. The blog post provides a high-level overview of how Compose Hot Reload works under the hood.
kotl.in
January 14, 2026 at 6:20 PM
Compose Hot Reload is now stable and bundled with Compose Multiplatform since v.1.10.0! 🎉
This deep dive by @sellmair.dev and Azat Abdullin walks through the engineering behind Compose Hot Reload and how it works under the hood.
For the curious among you 👀
https://kotl.in/hotreload100
This deep dive by @sellmair.dev and Azat Abdullin walks through the engineering behind Compose Hot Reload and how it works under the hood.
For the curious among you 👀
https://kotl.in/hotreload100
🎉 Advent of Code 2025 is officially a wrap!
We've selected nine prize winners in three categories: Fastest to Solve, Random, and Community. Each one brought something special to this year’s challenge.
Read the recap: https://blog.jetbrains.com/kotlin/2026/01/advent-of-code-2025-in-kotlin/
We've selected nine prize winners in three categories: Fastest to Solve, Random, and Community. Each one brought something special to this year’s challenge.
Read the recap: https://blog.jetbrains.com/kotlin/2026/01/advent-of-code-2025-in-kotlin/
Advent of Code 2025 in Kotlin: Puzzles, Prizes, and Community | The Kotlin Blog
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 codi
blog.jetbrains.com
January 14, 2026 at 3:46 PM
🎉 Advent of Code 2025 is officially a wrap!
We've selected nine prize winners in three categories: Fastest to Solve, Random, and Community. Each one brought something special to this year’s challenge.
Read the recap: https://blog.jetbrains.com/kotlin/2026/01/advent-of-code-2025-in-kotlin/
We've selected nine prize winners in three categories: Fastest to Solve, Random, and Community. Each one brought something special to this year’s challenge.
Read the recap: https://blog.jetbrains.com/kotlin/2026/01/advent-of-code-2025-in-kotlin/
Compose Multiplatform 1.10.0 is out! 🎉
What’s new:
✨ Common @Preview annotation
🧭 Support for Navigation 3 on non-Android targets
🔥 Stable and bundled Compose Hot Reload
Learn more: https://blog.jetbrains.com/kotlin/2026/01/compose-multiplatform-1-10-0/
What’s new:
✨ Common @Preview annotation
🧭 Support for Navigation 3 on non-Android targets
🔥 Stable and bundled Compose Hot Reload
Learn more: https://blog.jetbrains.com/kotlin/2026/01/compose-multiplatform-1-10-0/
Compose Multiplatform 1.10.0: Unified @Preview, Navigation 3, and Stable Compose Hot Reload | The Kotlin Blog
Compose Multiplatform 1.10.0 has been released with common @Preview annotation, support for Navigation 3 on non-Android targets, and bundled stable Compose Hot Reload.
blog.jetbrains.com
January 13, 2026 at 4:55 PM
Compose Multiplatform 1.10.0 is out! 🎉
What’s new:
✨ Common @Preview annotation
🧭 Support for Navigation 3 on non-Android targets
🔥 Stable and bundled Compose Hot Reload
Learn more: https://blog.jetbrains.com/kotlin/2026/01/compose-multiplatform-1-10-0/
What’s new:
✨ Common @Preview annotation
🧭 Support for Navigation 3 on non-Android targets
🔥 Stable and bundled Compose Hot Reload
Learn more: https://blog.jetbrains.com/kotlin/2026/01/compose-multiplatform-1-10-0/
Kick off KotlinConf by joining a workshop where you'll:
⚡ Upgrade your code
⚡ Strengthen your architecture
⚡ Explore new tools
⚡ Gain skills your team can use
⚡ Level up in KMP, backend, coroutines, or AI
🗓️ May 20 • 📍 Munich
Reserve your spot 👇
https://kotl.in/ws-2026-kbs
⚡ Upgrade your code
⚡ Strengthen your architecture
⚡ Explore new tools
⚡ Gain skills your team can use
⚡ Level up in KMP, backend, coroutines, or AI
🗓️ May 20 • 📍 Munich
Reserve your spot 👇
https://kotl.in/ws-2026-kbs
January 8, 2026 at 2:43 PM
Kick off KotlinConf by joining a workshop where you'll:
⚡ Upgrade your code
⚡ Strengthen your architecture
⚡ Explore new tools
⚡ Gain skills your team can use
⚡ Level up in KMP, backend, coroutines, or AI
🗓️ May 20 • 📍 Munich
Reserve your spot 👇
https://kotl.in/ws-2026-kbs
⚡ Upgrade your code
⚡ Strengthen your architecture
⚡ Explore new tools
⚡ Gain skills your team can use
⚡ Level up in KMP, backend, coroutines, or AI
🗓️ May 20 • 📍 Munich
Reserve your spot 👇
https://kotl.in/ws-2026-kbs
🤔 Want to convince your colleague, friend, or manager to give Kotlin Multiplatform a try?
Share our refreshed KMP landing page – it’s clear, practical, and full of real-world examples. 👇
https://kotl.in/kmp-bs
Share our refreshed KMP landing page – it’s clear, practical, and full of real-world examples. 👇
https://kotl.in/kmp-bs
January 7, 2026 at 4:14 PM
🤔 Want to convince your colleague, friend, or manager to give Kotlin Multiplatform a try?
Share our refreshed KMP landing page – it’s clear, practical, and full of real-world examples. 👇
https://kotl.in/kmp-bs
Share our refreshed KMP landing page – it’s clear, practical, and full of real-world examples. 👇
https://kotl.in/kmp-bs
Reposted by Kotlin by JetBrains
January 5, 2026 at 5:12 PM
📢 The Kotlin Multiplatform Contest deadline is January 12!
Students and recent grads, this is your chance to win a trip to KotlinConf 2026 in Munich – with tickets and hotels covered.
All valid entries receive Kotlin souvenirs!
Take part ⤵️
kotl.in/cntst-rmdr
Students and recent grads, this is your chance to win a trip to KotlinConf 2026 in Munich – with tickets and hotels covered.
All valid entries receive Kotlin souvenirs!
Take part ⤵️
kotl.in/cntst-rmdr
December 23, 2025 at 1:56 PM
📢 The Kotlin Multiplatform Contest deadline is January 12!
Students and recent grads, this is your chance to win a trip to KotlinConf 2026 in Munich – with tickets and hotels covered.
All valid entries receive Kotlin souvenirs!
Take part ⤵️
kotl.in/cntst-rmdr
Students and recent grads, this is your chance to win a trip to KotlinConf 2026 in Munich – with tickets and hotels covered.
All valid entries receive Kotlin souvenirs!
Take part ⤵️
kotl.in/cntst-rmdr
🌱 Spring Boot 4 is taking Kotlin support to the next level!
Thanks to a Kotlin 2.2 baseline, deeper null-safety, better serialization, and coroutine context propagation, Spring is now even more Kotlin-friendly.
Dive into the latest improvements 👉 https://kotl.in/im2t40
Thanks to a Kotlin 2.2 baseline, deeper null-safety, better serialization, and coroutine context propagation, Spring is now even more Kotlin-friendly.
Dive into the latest improvements 👉 https://kotl.in/im2t40
Next level Kotlin support in Spring Boot 4
Level up your Java code and explore what Spring can do for you.
kotl.in
December 21, 2025 at 4:47 PM
🌱 Spring Boot 4 is taking Kotlin support to the next level!
Thanks to a Kotlin 2.2 baseline, deeper null-safety, better serialization, and coroutine context propagation, Spring is now even more Kotlin-friendly.
Dive into the latest improvements 👉 https://kotl.in/im2t40
Thanks to a Kotlin 2.2 baseline, deeper null-safety, better serialization, and coroutine context propagation, Spring is now even more Kotlin-friendly.
Dive into the latest improvements 👉 https://kotl.in/im2t40
🎁 Holiday shopping hack – Buy a ticket to KotlinConf and enjoy:
✅ Loads of inspiration
✅ Talks that spark new ideas
✅ Some dev happiness
Get one for yourself or a friend 👇
https://kotl.in/kc-gift-kbs
✅ Loads of inspiration
✅ Talks that spark new ideas
✅ Some dev happiness
Get one for yourself or a friend 👇
https://kotl.in/kc-gift-kbs
December 19, 2025 at 2:11 PM
🎁 Holiday shopping hack – Buy a ticket to KotlinConf and enjoy:
✅ Loads of inspiration
✅ Talks that spark new ideas
✅ Some dev happiness
Get one for yourself or a friend 👇
https://kotl.in/kc-gift-kbs
✅ Loads of inspiration
✅ Talks that spark new ideas
✅ Some dev happiness
Get one for yourself or a friend 👇
https://kotl.in/kc-gift-kbs
✨ Introducing the Golden Kodee Community Awards ✨
We’re celebrating the people who make the Kotlin community shine – educators, creators, organizers, and innovators.
Think you deserve an award?
🏆 Nominate yourself now! → kotl.in/golden-kodee...
We’re celebrating the people who make the Kotlin community shine – educators, creators, organizers, and innovators.
Think you deserve an award?
🏆 Nominate yourself now! → kotl.in/golden-kodee...
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
December 19, 2025 at 10:51 AM
✨ Introducing the Golden Kodee Community Awards ✨
We’re celebrating the people who make the Kotlin community shine – educators, creators, organizers, and innovators.
Think you deserve an award?
🏆 Nominate yourself now! → kotl.in/golden-kodee...
We’re celebrating the people who make the Kotlin community shine – educators, creators, organizers, and innovators.
Think you deserve an award?
🏆 Nominate yourself now! → kotl.in/golden-kodee...
Reposted by Kotlin by JetBrains
⭐ 🎤 Kotlin powers products at companies like Meta, AWS, Duolingo, Uber, and more. At KotlinConf'25, these teams revealed how they use Kotlin to solve real engineering challenges in production.
Dive into their stories 👉 https://kotl.in/co3t0q
Dive into their stories 👉 https://kotl.in/co3t0q
Industry Leaders on the KotlinConf'25 Stage: What Global Brands Built With Kotlin | The Kotlin Blog
At KotlinConf'25, global brands like Meta, AWS, Duolingo, and Uber shared real-world engineering stories.
blog.jetbrains.com
December 18, 2025 at 6:04 PM
⭐ 🎤 Kotlin powers products at companies like Meta, AWS, Duolingo, Uber, and more. At KotlinConf'25, these teams revealed how they use Kotlin to solve real engineering challenges in production.
Dive into their stories 👉 https://kotl.in/co3t0q
Dive into their stories 👉 https://kotl.in/co3t0q
Need manager approval for KotlinConf?
Use our ready-made templates and join us in Munich, May 20–22.
👉 https://kotl.in/ma-kbs
Use our ready-made templates and join us in Munich, May 20–22.
👉 https://kotl.in/ma-kbs
December 18, 2025 at 2:22 PM
Need manager approval for KotlinConf?
Use our ready-made templates and join us in Munich, May 20–22.
👉 https://kotl.in/ma-kbs
Use our ready-made templates and join us in Munich, May 20–22.
👉 https://kotl.in/ma-kbs
A clean, modern intro to Spring Boot with instant switching between Java and Kotlin examples.
Worth a look if you’re comparing the two for your next project 👇 https://kotl.in/pkj849
Worth a look if you’re comparing the two for your next project 👇 https://kotl.in/pkj849
Getting Started | Building an Application with Spring Boot
Learn how to build an application with minimal configuration.
kotl.in
December 18, 2025 at 11:57 AM
A clean, modern intro to Spring Boot with instant switching between Java and Kotlin examples.
Worth a look if you’re comparing the two for your next project 👇 https://kotl.in/pkj849
Worth a look if you’re comparing the two for your next project 👇 https://kotl.in/pkj849
Thinking of taking your Android app multiplatform?
Together with the @androiddevs.bsky.social team and using Jetcaster as an example, we’ve created a migration guide that includes a repo where every commit represents a working state.
👉 https://kotl.in/g1q3h5
Together with the @androiddevs.bsky.social team and using Jetcaster as an example, we’ve created a migration guide that includes a repo where every commit represents a working state.
👉 https://kotl.in/g1q3h5
Migrating a Jetpack Compose app to Kotlin Multiplatform | Kotlin Multiplatform
kotlinlang.org
December 17, 2025 at 4:00 PM
Thinking of taking your Android app multiplatform?
Together with the @androiddevs.bsky.social team and using Jetcaster as an example, we’ve created a migration guide that includes a repo where every commit represents a working state.
👉 https://kotl.in/g1q3h5
Together with the @androiddevs.bsky.social team and using Jetcaster as an example, we’ve created a migration guide that includes a repo where every commit represents a working state.
👉 https://kotl.in/g1q3h5
💡 Did you know? Ktor has a built-in test framework for REST APIs.
Run tests in isolation, verify endpoints, and serialize types safely.
Docs 👉 https://kotl.in/ktor-test
Run tests in isolation, verify endpoints, and serialize types safely.
Docs 👉 https://kotl.in/ktor-test
December 16, 2025 at 3:54 PM
💡 Did you know? Ktor has a built-in test framework for REST APIs.
Run tests in isolation, verify endpoints, and serialize types safely.
Docs 👉 https://kotl.in/ktor-test
Run tests in isolation, verify endpoints, and serialize types safely.
Docs 👉 https://kotl.in/ktor-test
💸 Kotlin’s gaining traction in fintech!
ING’s engineers rebuilt their core payment engine in Kotlin – improving code quality, speeding up delivery, and fostering a growing internal Kotlin community.
🎥 Watch the story: https://www.youtube.com/watch?v=mexcjkGZIm8
ING’s engineers rebuilt their core payment engine in Kotlin – improving code quality, speeding up delivery, and fostering a growing internal Kotlin community.
🎥 Watch the story: https://www.youtube.com/watch?v=mexcjkGZIm8
Why ING Chooses Kotlin for Server-Side
YouTube video by Kotlin by JetBrains
www.youtube.com
December 16, 2025 at 2:13 PM
💸 Kotlin’s gaining traction in fintech!
ING’s engineers rebuilt their core payment engine in Kotlin – improving code quality, speeding up delivery, and fostering a growing internal Kotlin community.
🎥 Watch the story: https://www.youtube.com/watch?v=mexcjkGZIm8
ING’s engineers rebuilt their core payment engine in Kotlin – improving code quality, speeding up delivery, and fostering a growing internal Kotlin community.
🎥 Watch the story: https://www.youtube.com/watch?v=mexcjkGZIm8
KotlinConf workshops dive into the most in-demand areas, including:
✨ Kotlin and Compose Multiplatform
✨ Backend with Spring and Ktor
✨ AI agents in Kotlin
✨ Coroutines
✨ Functional Kotlin
🗓️ May 20 • 📍 Munich
Sign up today 👇
https://kotl.in/ws-2026-kbs
✨ Kotlin and Compose Multiplatform
✨ Backend with Spring and Ktor
✨ AI agents in Kotlin
✨ Coroutines
✨ Functional Kotlin
🗓️ May 20 • 📍 Munich
Sign up today 👇
https://kotl.in/ws-2026-kbs
December 16, 2025 at 1:42 PM
KotlinConf workshops dive into the most in-demand areas, including:
✨ Kotlin and Compose Multiplatform
✨ Backend with Spring and Ktor
✨ AI agents in Kotlin
✨ Coroutines
✨ Functional Kotlin
🗓️ May 20 • 📍 Munich
Sign up today 👇
https://kotl.in/ws-2026-kbs
✨ Kotlin and Compose Multiplatform
✨ Backend with Spring and Ktor
✨ AI agents in Kotlin
✨ Coroutines
✨ Functional Kotlin
🗓️ May 20 • 📍 Munich
Sign up today 👇
https://kotl.in/ws-2026-kbs
Reposted by Kotlin by JetBrains
👀 We’ve been working on something big – and let’s just say, you had something to do with it.
Stay tuned!
📮 https://kotl.in/gkodee-blu
Stay tuned!
📮 https://kotl.in/gkodee-blu
December 16, 2025 at 10:30 AM
👀 We’ve been working on something big – and let’s just say, you had something to do with it.
Stay tuned!
📮 https://kotl.in/gkodee-blu
Stay tuned!
📮 https://kotl.in/gkodee-blu
📓 Kotlin Notebooks let you run server-side experiments inline:
- query a DB
- test Ktor APIs
- prototype with coroutines.
And more!
Try it in @IntelliJIDEA
https://kotl.in/cf07id
- query a DB
- test Ktor APIs
- prototype with coroutines.
And more!
Try it in @IntelliJIDEA
https://kotl.in/cf07id
Get started with Kotlin Notebook | Kotlin
kotl.in
December 15, 2025 at 3:53 PM
📓 Kotlin Notebooks let you run server-side experiments inline:
- query a DB
- test Ktor APIs
- prototype with coroutines.
And more!
Try it in @IntelliJIDEA
https://kotl.in/cf07id
- query a DB
- test Ktor APIs
- prototype with coroutines.
And more!
Try it in @IntelliJIDEA
https://kotl.in/cf07id