List of the top contributors to the Kotlin Weekly in 2025 (this required a few iterations with AI to get it right):

Just tried Amper for the first time today. And I'm so in love already 🤤 It's SUPER simple to understand and configure, and just gets out of my way. I could even imagine doing major restructuring without the fear Gradle instilled into me. It's like, what the hell have we been tolerating

First-Class Kotlin Serialization Support in Spring Boot 4 itnext.io/first-class-...

In KtMongo 0.25.0, the new experimental BsonPath class allows extracting #MongoDB documents using #JSONPath queries! Currently only a subset of the JSONPath syntax is supported, more will be added in coming versions. Send us your feedback! ktmongo.opensavvy.dev/api/-kotlin%...

Kotlin 2.3.0 is out! Check out the highlights of this release on the Kotlin blog. 👉 https://kotl.in/trf88y

My last blog post of the year: Next level Kotlin support in Spring Boot 4. spring.io/blog/2025/12... #spring #kotlin

✨ 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...

Arrow-kt 2.2.1.1 is out. Release notes: arrow-kt.io/community/bl... If you're curious about the Arrow-kt, or functional programming in Kotlin be sure to check out the website. It's full of cool sections on resilience, typed errors, coroutines, STM, immutable data, etc.

Unused value checker is really awesome! If you've not tried it, it's experimental in Kotlin 2.3.0 and check you didn't forget any computed values. I.e. it checks if you forgot to call bind(), or flatMap on an Either value and are tossing the result. Release notes: arrow-kt.io/community/bl...

Arrow 2.2.1 is out! Taking into account the new @kotlinlang.org 2.3, the library is now ready for the “unused value checker” 👷 arrow-kt.io/community/bl...

Spring Boot 4 now has automatic context propagation for Kotlin coroutines 🎉 Trace context flows inside coroutine execution, making async code simpler and ensuring seamless integration – all in the familiar Spring ecosystem. Try Spring with @kotlinlang.org 👉https://kotl.in/vk4h77

Kotlin 2.3.0 is out! My faves (no order) 😅 - Unused value checker - Improved Context Sensitive Resolution - Java 25 Bytecode - JS suspend function export - Better Swift Interop - Explicit backing fields - New Kotlin Uuid APIs and there is much more! Check it out: blog.jetbrains.com/kotlin/2025/...

💡 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

Goodbye K1 mode! 👋 IntelliJ IDEA 2025.3 deprecates Kotlin K1. K2 now powers the IDE via the Kotlin Analysis API. This means: ⚡ Faster analysis on large projects 🧱 Stable foundation for evolving Kotlin support 🛠️ Improved stability More in the blog 👇 blog.jetbrains.com/idea/2025/12...

📢 If you’ve been meaning to send your KotlinConf 2026 talk proposal – this is your sign to do it now! The Call for Speakers is wrapping up tomorrow! Don’t miss the opportunity to share your expertise at the world’s largest Kotlin event. Submit here ⤵️ sessionize.com/kotlinconf-2...

Amper powered Apollo github.com/martinbonnin...

In 2 weeks we’re kicking off the Belgium @kotlinlang.org User Group with @sch3lp.bsky.social! The first session since 2019 😍 We’re starting off with a talk, and afterwards we’ll have an open space. There’ll will be lots of Kotlin and Kodee goodies 😁 See you there! www.meetup.com/belgian-kotl...

🐳 Ready to take your Ktor app live? With the Ktor Gradle plugin, packaging and deployment become simple and seamless. Check out this step‑by‑step guide to ensure smooth deployment 👉 https://kotl.in/tkzc0l

The most frequent question about Amper is definitely the extensibility story. You can find the answer now in the blog about the 0.9.0 release!

Kotlin samples are now part of the official Spring tutorials! 🚀 Check out the Spring WebFlux guide to build a RESTful web service, and switch easily between Java and Kotlin examples ⬇️ https://spring.io/guides/gs/reactive-rest-service

Want to advance your career as an Android developer by learning Kotlin Multiplatform (KMP)? Learn from LEGENDS like Jake Wharton, Philipp Lackner, @zacsweers.dev, @russhwolf.com, @marcogomiero.com , and @chriskrueger.dev. More info and register here: info.jetbrains.com/kotlin-lives...

blog.jetbrains.com/kotlin/2025/... great blog post that proves why moving to Kotlin is a good choice. @jlengrand.bsky.social and I can vouch for that 😉

All my fellow @kotlinlang.org server devs, there is still time to fill the annual Ktor survey! If you're using Ktor then please consider filling the survey, and help us continue making it better.

The @kotlinlang.org DA team @jetbrains.com is looking for a new team member to help promote and collaborate with Kotlin on the server with Spring! If you're passionate about Kotlin, and Spring this might be just the thing for you. job-boards.eu.greenhouse.io/jetbrains/jo...

Happy to announce that #Kotlin Community Stand was accepted at #FOSDEM2026! All Kotlin enthusiasts, see you in Brussels soon! fosdem.org/2026/news/20...

Just 6 months after a small-circle demo at KotlinConf, TestBalloon has achieved its first 100 stars on GitHub today. ♥️ On a mission to make Kotlin testing incredibly easy, its trajectory is showing lots of upwind, even compared to the wildly popular (and excellent) Ktor. github.com/infix-de/tes...

⏳ There are just two weeks left to submit your talk for KotlinConf’26! 👉 sessionize.com/kotlinconf-2... 👈

#Kotlin Context Parameters are super powerful and versatile @vadim-briliantov.bsky.social explains in this blog how to ensure correct usages of APIs by using context parameters to turn out of scope function calls into a compilation error. blog.kotlin-academy.com/stop-bugs-be...

Any Ktor fans out there? We have a survey for you too!

Two more weeks to submit your talks for @kotlinconf.com! In case you’ve been procrastinating like me.. This weekend might be the perfect time to write yours too! Come and share any awesome work you’ve done with @kotlinlang.org! Good luck 👍 sessionize.com/kotlinconf-2...

15 years ago, this happened: github.com/JetBrains/ko... #kotlin

🎉 Ktor 3.3.2 is here! Explore the changelog to learn more. kotl.in/nf86gx

TestBalloon, the next generation Kotlin test framework, has now reached flight level 0.7.1. Please do check out its unique combination of characteristics, making it 🌋 powerful, 🚀 blazingly fast, and ☺️ so easy to use. There's a brand-new documentation site, too! github.com/infix-de/tes...

📣 Calling all Ktor users! We’d love your input! Take our annual survey and share your thoughts, challenges, and ideas to help us make the framework even better. Your feedback shapes the future of Ktor 🚀 Take the survey 👉 surveys.jetbrains.com/s3/05ddc3ebe...

@chrzanowski.info's Kotlin Notebook featuring IntelliJ Platform code: gist.github.com/hsz/cc66e84f...

There's less than a month left to submit your talk ideas to KotlinConf 2026! Why not do it today?

🏦 Trust in Kotlin across the financial technology sector is growing. Yuri Geronimus (Verifone) explains why Kotlin is becoming a strategic choice for payment systems and enterprise-scale solutions. Learn more👇 yurigeronimus.medium.com/kotlin-in-pa...

There's also a new beta Gradle plug-in to simplify the configuration of Arrow Optics arrow-kt.io/community/bl...

Arrow 2.2.0 is out! arrow-kt.io/community/bl... - Raise with context parameters - More DSLs for concurrency, - "At most once" for Eval, - New integration with Result4k

Finding Order in the Mayhem: A Novel Concurrency Testing Tool that Improved the Kotlin Compiler https://lobste.rs/s/xkziyp ##testing ##kotlin

happy halloween and wait why is kodee orange

There's a GitHub repo up on github.com/mreichelt/ko..., with some handy scripts to try these features out yourself!

Warming up for @droidcon.bsky.social London? Why not also warm up your JVMs to get faster startup times, with CRaC, Ahead-of-Time Class Loading & Linking (JEP 483) and AoT Method Profiling (JEP 515)? My Droidcon Berlin talk is now up - enjoy! www.youtube.com/watch?v=paoA...

if you see this post, your actions are: - if you have a spare buck, give it to Wikipedia, then repost this - if you don't have a spare buck, just repost your action is mandatory for the world's best source of information to survive

You can find the workshop about Pure Functions, Powerful Effects, you can find it here: jb.gg/8obvnt

Had an amazing time at #LambdaWorld 25! Gave 2 workshops with @serranofp.com about @kotlinlang.org. Had great chats about Kotlin not the server, for FP, Kotlin Notebooks, @jetbrains.com and @intellijidea.com 😍 You can find the workshops here: jb.gg/tj9qf6 Hope to see you all next year!

It’s Lamda World today and tomorrow and I brought Kodee!! Come to @serranofp.com and my workshop today, or swing by the @kotlinlang.org @jetbrains.com booth tomorrow and come say hi! Hope to see you there!

JetBrains Plugin Developer Conf returns this November! Join JetBrains experts and plugin developers for a full day of inspiring talks, live Q&A sessions, and deep dives into the latest in plugin development. 🗓️ November 5 | 10:00 am CET 💻 Online 💸 Free Register 👉 jb.gg/PluginDevelo...

A conversation around Kotlin coroutines 💜 @sebi.io, @zsmb.co, and @marcinmoskala.bsky.social spent two glorious hours exploring coroutines in depth. 🎙️ If you love Kotlin, you won't want to miss this episode: www.youtube.com/watch?v=1zY4...