Sebastian Aigner 📡
@sebi.io
Dev Advocate at JetBrains. Teaching ∞ Learning Kotlin & Compose Multiplatform. Talking Kotlin. Working w/ with love, for there is no other way. Always iterating.
Reposted by Sebastian Aigner 📡
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
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
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
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
With Kotlin Coroutines, you can build performant and reliable systems. But to do so, you need a solid understanding of the mechanics that govern how they work. Come join my KotlinConf workshop to learn everything you need to know! kotlinconf.com/workshops/
January 13, 2026 at 9:00 AM
With Kotlin Coroutines, you can build performant and reliable systems. But to do so, you need a solid understanding of the mechanics that govern how they work. Come join my KotlinConf workshop to learn everything you need to know! kotlinconf.com/workshops/
Reposted by Sebastian Aigner 📡
✨ 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...
The Call for Speakers for KotlinConf 2026 is still open! I'm not exaggerating when I say it's *the* Kotlin event of the year. Please submit to the CFP! Being a speaker is a really exciting way to experience KotlinConf, and share what you know! ❤️ sessionize.com/kotlinconf-2...
October 29, 2025 at 8:48 AM
The Call for Speakers for KotlinConf 2026 is still open! I'm not exaggerating when I say it's *the* Kotlin event of the year. Please submit to the CFP! Being a speaker is a really exciting way to experience KotlinConf, and share what you know! ❤️ sessionize.com/kotlinconf-2...
Kotlin 2.2.21 and 2.2.20 have a lot goodies in them. In my video, I'm looking at the highlights! www.youtube.com/watch?v=QWpp...
What's new in Kotlin 2.2.21 (and 2.2.20!)
YouTube video by Kotlin by JetBrains
www.youtube.com
October 23, 2025 at 2:00 PM
Kotlin 2.2.21 and 2.2.20 have a lot goodies in them. In my video, I'm looking at the highlights! www.youtube.com/watch?v=QWpp...
Reposted by Sebastian Aigner 📡
KotlinConf 2026 CFP is open! 🔥
Looking forward to all your awesome submissions, and hearing about all the cool things everyone has been up to😁
sessionize.com/kotlinconf-2...
Looking forward to all your awesome submissions, and hearing about all the cool things everyone has been up to😁
sessionize.com/kotlinconf-2...
KotlinConf 2026: Call for Speakers
KotlinConf is an official conference by JetBrains. It is devoted to the Kotlin programming language and is the place for the community to gather and d...
sessionize.com
September 15, 2025 at 8:08 AM
KotlinConf 2026 CFP is open! 🔥
Looking forward to all your awesome submissions, and hearing about all the cool things everyone has been up to😁
sessionize.com/kotlinconf-2...
Looking forward to all your awesome submissions, and hearing about all the cool things everyone has been up to😁
sessionize.com/kotlinconf-2...
Koog, the Agentic AI framework for Kotlin that we're building at JetBrains, is, well, kind of cool. Especially since it's not designed for toy projects, but to ✨ scale ✨! Learn more: medium.com/@vadim.brili...
Why JetBrains’ Koog is The Most Advanced JVM Framework For Building AI Agents .
Koog: JetBrains’ JVM framework for building enterprise-grade AI agents.
medium.com
September 5, 2025 at 5:30 AM
Koog, the Agentic AI framework for Kotlin that we're building at JetBrains, is, well, kind of cool. Especially since it's not designed for toy projects, but to ✨ scale ✨! Learn more: medium.com/@vadim.brili...
@lilywhiteout.bsky.social Azerbaijan Kodee greets you!
September 4, 2025 at 12:01 PM
@lilywhiteout.bsky.social Azerbaijan Kodee greets you!
Reposted by Sebastian Aigner 📡
If you have feedback about *anything* around Kotlin, this is the time to have your voice heard in our annual Kotlin Developer Survey.
The language, the tooling, the ecosystem, Kotlin Multiplatform, Compose... It's all in there!
Takes just 10 minutes:
The language, the tooling, the ecosystem, Kotlin Multiplatform, Compose... It's all in there!
Takes just 10 minutes:
Kotlin Developer Survey 2025
Kotlin Developer Survey 2025.
surveys.jetbrains.com
September 2, 2025 at 1:23 PM
If you have feedback about *anything* around Kotlin, this is the time to have your voice heard in our annual Kotlin Developer Survey.
The language, the tooling, the ecosystem, Kotlin Multiplatform, Compose... It's all in there!
Takes just 10 minutes:
The language, the tooling, the ecosystem, Kotlin Multiplatform, Compose... It's all in there!
Takes just 10 minutes:
We're running the Kotlin Developer Survey 2025; make your voice heard! 🎤 Help us understand what's great when working with Kotlin, and what's not! You'll help make Kotlin better not just for yourself, but for everybody! Thanks in advance ❤️
surveys.jetbrains.com/s3/68aaa1b46...
surveys.jetbrains.com/s3/68aaa1b46...
Kotlin Developer Survey 2025
surveys.jetbrains.com
August 25, 2025 at 11:59 AM
We're running the Kotlin Developer Survey 2025; make your voice heard! 🎤 Help us understand what's great when working with Kotlin, and what's not! You'll help make Kotlin better not just for yourself, but for everybody! Thanks in advance ❤️
surveys.jetbrains.com/s3/68aaa1b46...
surveys.jetbrains.com/s3/68aaa1b46...
Reposted by Sebastian Aigner 📡
🎉 New Talking Kotlin episode!
@sebi.io chats with Alex Sysoev, author of KotlinX RPC, an experimental but powerful library for building RPC services and clients in Kotlin.
Watch on YouTube 👉 kotl.in/572emq
@sebi.io chats with Alex Sysoev, author of KotlinX RPC, an experimental but powerful library for building RPC services and clients in Kotlin.
Watch on YouTube 👉 kotl.in/572emq
August 22, 2025 at 9:11 AM
🎉 New Talking Kotlin episode!
@sebi.io chats with Alex Sysoev, author of KotlinX RPC, an experimental but powerful library for building RPC services and clients in Kotlin.
Watch on YouTube 👉 kotl.in/572emq
@sebi.io chats with Alex Sysoev, author of KotlinX RPC, an experimental but powerful library for building RPC services and clients in Kotlin.
Watch on YouTube 👉 kotl.in/572emq
Reposted by Sebastian Aigner 📡
August 5, 2025 at 1:49 PM
Reposted by Sebastian Aigner 📡
A nice conference about #ComposeMultiplatform for iOs and more by @sebi.io at #KotlinConf 25 www.youtube.com/watch?v=YKTl...
Compose Multiplatform for iOS: Ready for Production Use | Sebastian Aigner
YouTube video by Kotlin by JetBrains
www.youtube.com
August 3, 2025 at 1:44 PM
A nice conference about #ComposeMultiplatform for iOs and more by @sebi.io at #KotlinConf 25 www.youtube.com/watch?v=YKTl...
Reposted by Sebastian Aigner 📡
OH FUN FACT FOR THOSE WHO DONT LOOK AT MY X/TWITTER
i drew fanart for this
i drew fanart for this
July 29, 2025 at 9:18 AM
OH FUN FACT FOR THOSE WHO DONT LOOK AT MY X/TWITTER
i drew fanart for this
i drew fanart for this
Kotlin coroutines are great. Their core primitive is the suspending function. With a small change in your IDE settings, you can give them a custom color (like a bright green), which makes it easy to spot them at a glance, even when you're looking at a lot of code.
July 25, 2025 at 9:18 AM
Kotlin coroutines are great. Their core primitive is the suspending function. With a small change in your IDE settings, you can give them a custom color (like a bright green), which makes it easy to spot them at a glance, even when you're looking at a lot of code.
Reposted by Sebastian Aigner 📡
the brain that can see a face in a wall outlet was always doomed to hear the voice of God in a markov chain
July 24, 2025 at 2:05 AM
the brain that can see a face in a wall outlet was always doomed to hear the voice of God in a markov chain
Reposted by Sebastian Aigner 📡
something something @nanami.codes something something this looks so ass IM SORRY
July 22, 2025 at 6:18 AM
something something @nanami.codes something something this looks so ass IM SORRY
Reposted by Sebastian Aigner 📡
And as a reminder, you can already run the same code on iOS, web (hah) and desktop already. You even get Compose Hot Reload for live tweaking in that last case!
July 17, 2025 at 8:08 AM
And as a reminder, you can already run the same code on iOS, web (hah) and desktop already. You even get Compose Hot Reload for live tweaking in that last case!
If you’re a Kotlin library maintainer, consider submitting to the Kotlin Foundation Grants program for a chance to get financial and promotional support for your library! 🚀 Deadline is July 31, don’t miss it!
July 16, 2025 at 1:09 PM
If you’re a Kotlin library maintainer, consider submitting to the Kotlin Foundation Grants program for a chance to get financial and promotional support for your library! 🚀 Deadline is July 31, don’t miss it!
Reposted by Sebastian Aigner 📡
Somehow I missed the livestream with @sebi.io and the Kotlin language designers! I don't know how it happened 🤯 Did you miss it too? Quick, let's watch it before they notice!
www.youtube.com/watch?v=jne3...
www.youtube.com/watch?v=jne3...
Kotlin 2.2 Livestream With the Language Evolution Team
YouTube video by Kotlin by JetBrains
www.youtube.com
July 11, 2025 at 12:24 PM
Somehow I missed the livestream with @sebi.io and the Kotlin language designers! I don't know how it happened 🤯 Did you miss it too? Quick, let's watch it before they notice!
www.youtube.com/watch?v=jne3...
www.youtube.com/watch?v=jne3...
Reposted by Sebastian Aigner 📡
Video of my talk at @kotlinconf.com 2025 now publicly available youtu.be/O0BqoLcRuJI?...
Kotlin and Compose Multiplatform Patterns for iOS Interop | John O'Reilly
YouTube video by Kotlin by JetBrains
youtu.be
July 10, 2025 at 7:01 AM
Video of my talk at @kotlinconf.com 2025 now publicly available youtu.be/O0BqoLcRuJI?...
Reposted by Sebastian Aigner 📡
In two days Mikhail Zarechenskii, @sebi.io and I will be exploring the new features of @kotlinlang.org 2.2 in a livestream. Learn about the new tricks, and ask any questions you may have!
📅 July 10
⏰ 4:00 pm CET
👉 kotl.in/2-2-livestream
📅 July 10
⏰ 4:00 pm CET
👉 kotl.in/2-2-livestream
Live Webinar -
kotl.in
July 8, 2025 at 3:41 PM
In two days Mikhail Zarechenskii, @sebi.io and I will be exploring the new features of @kotlinlang.org 2.2 in a livestream. Learn about the new tricks, and ask any questions you may have!
📅 July 10
⏰ 4:00 pm CET
👉 kotl.in/2-2-livestream
📅 July 10
⏰ 4:00 pm CET
👉 kotl.in/2-2-livestream