iiinova — where your digital self keeps evolving

Reposted by Alejandro Serrano Mena

Companion Blocks & Extensions are ready for testing in Kotlin 2.5.0-Beta1. I've spent a good chunk of the last months working on this feature, so I'm very excited for the experimental release. blog.jetbrains.com/kotlin/2026/...

blog.jetbrains.com

The Companions to Come - The JetBrains Blog

Kotlin 2.5.0 introduces experimental companion blocks and extensions. Learn what they unlock, how to enable them, and what it means for companion objects.

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Alejandro Serrano Mena @serranofp.com · 28/09/2026

In case it's not clear from the example, this plug-in has 100% arisen from me getting tired of writing `.build()` when using Spring AI.

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Alejandro Serrano Mena @serranofp.com · 28/09/2026

I'm super happy to announce my latest project: the Builder Lambda plug-in! github.com/serras/build... This plug-in re-exposes builders from Java in a Kotlin-idiomatic way: as a lambda in which you set the different properties. The generated code has no trace, though, it calls the builder directly.

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Reposted by Alejandro Serrano Mena

Simon Vergauwen @vergauwensimon.bsky.social · 23/09/2026

“Companion extensions and blocks” 🔥 This is a feature many of us have been waiting a long time for! Maybe years before I even knew this is what I wanted 😄

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Reposted by Alejandro Serrano Mena

Pamela Hill-Galloway @pamelaahill.bsky.social · 21/09/2026

It's out! Learn more about Name-Based Destructuring in Kotlin. I promise not to make you sing. www.youtube.com/watch?v=He8J...

youtube.com

Kotlin's Name-Based Destructuring

YouTube video by Kotlin by JetBrains

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 16/09/2026

📢 Kotlin devs, we want to hear from you! We're running a survey to understand your day-to-day challenges and experiences with Kotlin – whether it's the language, the tools, or the IDEs. It only takes 15 minutes! Share your thoughts with us here: kotl.in/hajfxg

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 16/09/2026

📍 The Kotlin roadmap has been updated! The four directions we're focused on: ✨ Language evolution 📱 Kotlin Multiplatform 🧩 Staying agnostic 📦 The experience of third-party ecosystem authors See what's behind each one 👇 kotl.in/rv5too

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Reposted by Alejandro Serrano Mena

KotlinConf @kotlinconf.com · 16/09/2026

🔥 The Kotlin community is already planning the next reunion! 📍 Kraków, Poland 📅 April 21-23 KotlinConf 2027 Super Early Bird tickets are now on sale – it’s the lowest price for the biggest Kotlin event of the year. 🎟️ Get yours today! kotl.in/conf27-seb-x

kotl.in

KotlinConf 2027, Apr 21–23, Kraków

KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.

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Reposted by Alejandro Serrano Mena

Márton Braun @zsmb.co · 16/09/2026

The 2026 Kotlin Developer Survey is live! Use this chance to send feedback directly to the team, on everything Kotlin-related 👇

surveys.jetbrains.com

Kotlin Developer Survey 2026

Kotlin Developer Survey 2026.

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 07/09/2026

📢 Kotlin 2.4.20 is out! Learn more: ➡️ kotl.in/2-4-20

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Reposted by Alejandro Serrano Mena

Márton Braun @zsmb.co · 03/09/2026

Kotlin Toolchain 0.12 was just released! It includes... 📚 KMP library publication (!) 🌐 Wasm app support 🖼️ Compose Preview support + more Android tooling 🔥 Better Compose Hot Reload 🍎 iOS improvements ... and much more! Learn about the rest here:

blog.jetbrains.com

Kotlin Toolchain 0.12: Multiplatform Library Publishing, Wasm Apps, and More - The JetBrains Blog

Kotlin Toolchain 0.12.0 is out, with multiplatform library publishing, a Wasm app preview, Compose Hot Reload from the command line, and more.

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 01/09/2026

🎉 Good news: You have more time to learn Kotlin! Free access to select Kotlin courses on Hyperskill has been extended until October 9. Learn through hands-on projects, whether you're just getting started with Kotlin or looking to level up your skills. Explore the courses 👇 kotl.in/a1ityw

Text says: "Free Access to Selected Kotlin Courses." The background is a black and white dotted pattern.

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 24/08/2026

⚠️ A function signs a document. What could go wrong? The function signature won’t give you any ideas. Sergey Chernov from Salmon shows how sealed error types keep expected failures in the function contract. Read the full post 👇 kotl.in/5wawvp

kotl.in

Signatures, be true: domain errors and functional handling in Kotlin - The JetBrains Blog

Learn how to make expected failures visible in Kotlin function signatures with sealed error types and Either.

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Reposted by Alejandro Serrano Mena

Pamela Hill-Galloway @pamelaahill.bsky.social · 11/08/2026

My latest video for the Kotlin channel is out! There are some nice juicy features in this release - check it out! www.youtube.com/watch?v=RI4J...

youtube.com

What’s New in Kotlin 2.4 | Featuring: Collection literals | Swift Export | SPM import

YouTube video by Kotlin by JetBrains

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Reposted by Alejandro Serrano Mena

Simon Vergauwen @vergauwensimon.bsky.social · 11/08/2026

Check out @pamelaahill.bsky.social's video on #Kotlin 2.4! She covers so many topics. My favourites: - Context parameters & explicit context arguments - Collection literals - Compile-time constants - Uuid - New Map functions - Swift import & Concurrency Blog: kotlinlang.org/docs/whatsne...

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Alejandro Serrano Mena @serranofp.com · 27/07/2026

In the latest days I’ve done a big update to the “Poké-Fun with Kotlin and Arrow” guide serranofp.com/poke-fun/ - Much more about optics - New section about using (local) LLMs with Koog - Over-arching tasks such as comparing different domain representations

serranofp.com

Welcome

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Reposted by Alejandro Serrano Mena

Sebastian Sellmair @sellmair.dev · 17/07/2026

Let me share the '.kar' (Kotlin Archive) file format 🙇‍♂️! A single binary you can publish, which shall carry everything necessary to build your project! While this is a prototype, I really would like to share some of our early measurements! 🥳

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Reposted by Alejandro Serrano Mena

Simon Vergauwen @vergauwensimon.bsky.social · 09/07/2026

Who here is using agents extensively with #Kotlin/Java and #Gradle? Have you ever seen agents `unzip jar`, or parse `build/reports/test`? Or any other silly things? I've been trying to streamline these scenarios to make working with agents more efficient. Check it out. github.com/nomisRev/age...

github.com

GitHub - nomisRev/agent-tools-for-kotlin: Agent Tools for Kotlin to make coding agents more efficient with Kotlin & Gradle

Agent Tools for Kotlin to make coding agents more efficient with Kotlin & Gradle - nomisRev/agent-tools-for-kotlin

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Reposted by Alejandro Serrano Mena

Leanpub @leanpub.bsky.social · 05/07/2026

Haskell Wizard by Alejandro Serrano Mena is the featured bundle of ebooks 📚 on Leanpub! Become a real Haskell wizard with these two books! On the one hand, get your hands dirty with every major library in the ecosystem. On the other hand, climb the ivory … leanpub.com/b/haskell-wi...

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 03/07/2026

⏰ Just two weeks left! Apply by July 14 for a 2026 Kotlin Foundation Grant for Library Authors. Building an open-source Kotlin library, tool, or framework? Your project could receive funding – especially if it advances Multiplatform, AI, or LLM development. Apply now 👇 kotl.in/muii75

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Reposted by Alejandro Serrano Mena

Dave Leeds @typealias.com · 17/06/2026

We've been looking forward to this one! Kotlin 2.4 introduces collection literals. Create lists as easy as `val x = [1, 2, 3]`. They can even be combined with name-based destructuring for a neat effect. Today's 6-minute video is all about 'em: www.youtube.com/watch?v=cXg4... #Kotlin #AndroidDev

youtube.com

We've Been Looking Forward to This One...

YouTube video by Dave Leeds

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Reposted by Alejandro Serrano Mena

JetBrains @jetbrains.com · 16/06/2026

🎉 Kotlin turns 15 this year! 🎉 As part of the celebration, we've brought the Kotlin Effect into real life – making everyday situations more concise, efficient, and fun. Explore the Kotlin Effect further: kotl.in/6xzc69

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Reposted by Alejandro Serrano Mena

Pamela Hill-Galloway @pamelaahill.bsky.social · 16/06/2026

It must be... the Kotlin Effect. www.youtube.com/watch?v=4Qey...

youtube.com

The Kotlin Effect in Real Life

YouTube video by Kotlin by JetBrains

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Reposted by Alejandro Serrano Mena

Brian Norman @bnorm.dev · 04/06/2026

Kotlin 2.4.0 ships with a HUGE power-assert update I've been slowly working on for *years*. It's the culmination of efforts I started before joining JetBrains. It's subtle from the user's perspective, but it helped fixed a bunch of problems and unblocks tons of future improvements! 🚀

kotlinlang.org

Power-assert compiler plugin | Kotlin

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Alejandro Serrano Mena @serranofp.com · 04/06/2026

Today I’m speaking at J-Spring about Kotlin! @nljug.bsky.social

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 03/06/2026

📢 Kotlin 2.4.0 is out! Learn more: ➡️ kotl.in/2-4-0

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 30/05/2026

Ever upgraded Kotlin? We’d love your feedback! Tell us about your experience with Kotlin releases, including EAPs, stable versions, and patches! ⏱️ It takes just 12 minutes. Share your thoughts with us here: surveys.jetbrains.com/s3/Kotlin-rel…

surveys.jetbrains.com

Kotlin Release Survey

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 26/05/2026

Kotlin is moving toward name-based destructuring – new syntax that will make reordering and moving properties a breeze. No worries: There will be a long migration period with compiler and IDE support. Learn what’s changing and how the migration will work 👇 kotl.in/8nny1l

kotl.in

The Road to Name-Based Destructuring | The Kotlin Blog

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

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Reposted by Alejandro Serrano Mena

Márton Braun @zsmb.co · 26/05/2026

If you somehow missed the KotlinConf keynote last week, here are the top 10 KMP announcements with links to learn more about each 🧵👇

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Alejandro Serrano Mena @serranofp.com · 20/05/2026

If you’re at @kotlinconf.com the next couple of days, come and say hi to the Language Evolution team! We have a booth dedicated to new and upcoming language features, and would love to know what you miss in @kotlinlang.org.

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Reposted by Alejandro Serrano Mena

Márton Braun @zsmb.co · 14/05/2026

The next video on the Kotlin YouTube channel is scheduled for tomorrow, with some exciting KMP news! And that reminds me: we need just ~1000 more people to get to 100k subscribers. Can get that by KotlinConf next week?

youtube.com

Kotlin by JetBrains - YouTube

Concise. Multiplatform. Fun.Kotlin is a concise, cross-platform programming language developed by JetBrains.Expand your Kotlin skills with the official YouTu...

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Reposted by Alejandro Serrano Mena

Márton Braun @zsmb.co · 13/05/2026

Happy to share that we have folks from the language design team blogging about new features! Check out this post by @serranofp.com about how Kotlin is moving to a safer, Name-Based Destructuring syntax: blog.jetbrains.com/kotlin/2026/...

blog.jetbrains.com

The Road to Name-Based Destructuring | The Kotlin Blog

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

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Reposted by Alejandro Serrano Mena

Kotlin by JetBrains @kotlinlang.org · 04/05/2026

⚙️ Want more robust async patterns in your backend? Simon Vergauwen dives into structured concurrency in Ktor for real-world services. Watch the talk and see how it applies in practice 👇 www.youtube.com/watch?v=JxTIZAEos8Y

youtube.com

Coroutines and Structured Concurrency in Ktor | Simon Vergauwen

YouTube video by Kotlin by JetBrains

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Reposted by Alejandro Serrano Mena

Ivan “CLOVIS” Canet @ivcanet.bsky.social · 04/05/2026

Error handling is NOT about nesting flatMaps… and other Arrow misconceptions ivan.canet.dev/blog/2026/05...

ivan.canet.dev

Arrow: Error handling without flatMap - Ivan “CLOVIS” Canet

Software engineering, open source and computer security

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Alejandro Serrano Mena @serranofp.com · 23/04/2026

This is your chance to learn coroutines from one of the best educators in the community 👨‍🏫, and one of the best engineers in the team 👩‍🔧 (and me 😬)

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Reposted by Alejandro Serrano Mena

KotlinConf @kotlinconf.com · 23/04/2026

Using coroutines but not 100% confident you’re doing it right? Join the Coroutines workshop and learn how to build reliable, high-performance concurrent systems. 🗓️ May 20 · 📍 Munich ⚠️ Spots are filling up fast – save yours now 👇 kotl.in/coroutines-workshop

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Reposted by Alejandro Serrano Mena

KTConf @ktconf.bsky.social · 18/04/2026

🎟️ Early bird tickets for KTConf 2026 are live! Belgium's Kotlin conference returns Fri Sept 18 at Museum M in Leuven. Talks, reception, dinner — €250. Grab yours before early bird runs out: ktconf.be/tickets/ #Kotlin #KotlinLang #KTConf

ktconf.be

Tickets

Get your tickets for KTConf 2026

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Alejandro Serrano Mena @serranofp.com · 16/04/2026

In Lean you can use a `Prop` inside an `if` when it has a `Decidable` instance. Such an elegant design! lean-lang.org/functional_p...

lean-lang.org

Standard Classes

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Alejandro Serrano Mena @serranofp.com · 15/04/2026

This is a great intro to the new @kotlinlang.org feature, including all the migration facilities

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Dave Leeds @typealias.com · 15/04/2026

Have you tried name-based destructuring in Kotlin 2.3.20? In this clip from the recent TypeAlias Show, you can learn all about the three modes of this new experimental feature, and see how you can start using it (or migrating toward it!) in your own projects. www.youtube.com/watch?v=tvpB...

youtube.com

The New Name-Based Destructuring in Kotlin 2.3.20

YouTube video by Dave Leeds

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Alejandro Serrano Mena @serranofp.com · 10/04/2026

I've decided it's time to seriously learn Lean 4. I had forgotten how nice is to work with interactive programming language environments!

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