KotlinConf

Want to see KotlinConf 2027 from the inside? Join the volunteer team for a backstage pass (well, a volunteer badge). Meet fellow Kotlin fans, catch great talks, and help bring the conference to life. The call for volunteers is open! Apply here: https://kotl.in/8b9tdz

Thinking about speaking at KotlinConf 2027? You don’t need years of experience or a groundbreaking idea. Get practical advice on shaping your story, writing a clear proposal, and showing reviewers what makes it worth sharing. Learn more: kotl.in/n69hda

Oh no, Kodee doesn't yet have a ticket to KotlinConf! Kodee is going to do something about it – and you might want to, too, because KotlinConf ticket prices increase in three days. Secure your spot and join us in Kraków, Poland, April 21–23, 2027: https://kotl.in/vl4a8n

This is one more error you can fix before it even happens: KotlinConf 2027 ticket prices are increasing soon! Get yours now and join us in Kraków, Poland, April 21–23: https://kotl.in/l9sjpr

Your Kotlin story could take the stage in Kraków! 🎤 The KotlinConf 2027 Call for Papers is now open. Submit your talk and share your ideas, experience, and expertise with the Kotlin community. Apply now: https://kotl.in/gnmin6

🔥 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

Any guesses where Kodee is traveling to next? 📍

Throwback to KotlinConf'26 💜 We had a great time catching up with the Kotlin community, meeting so many of you in person, and enjoying everything the conference had to offer. We're already looking forward to KotlinConf'27!

Don’t forget to subscribe to our newsletter! Something big is coming soon, and you can be among the first to know! https://kotlinconf.com/subscription/

Even with high hopes, Matheus Leandro Ferreira knew the competition was tough. 👉 Read his reflections on winning a Golden Kodee and learn about others’ roads to victory in our latest blog post: https://kotl.in/bqs18m

When the competition is strong, nothing feels certain. 👉 Read @skydoves.bsky.social's reflections on winning a Golden Kodee and explore more winner stories in our latest blog post: https://kotl.in/bqs18m

@nicole-terc.bsky.social was convinced she wasn't taking home a Golden Kodee, making the win all the more memorable. 👉 Read her interview and discover more stories from this year's Golden Kodee winners: https://kotl.in/bqs18m

Winning a Golden Kodee was somewhere between a surprise and an expectation for Eeva Jonna Panula. Read her story and meet more of this year's Golden Kodee winners in our latest blog post. 👇 https://kotl.in/bqs18m

What goes through your mind when you win a Golden Kodee? 👉 Read Yinlong Liu's reflections and discover more stories from this year's Golden Kodee winners in our latest blog post: https://kotl.in/bqs18m

What does it take to master deep technical expertise and build a thriving community? The Golden Kodee winners break down their journeys and share technical insights and career advice in our new interview series. 🔗 Learn from our winners here: https://kotl.in/bqs18m

With #KotlinConf26 in the rearview mirror, we want to hear from you! Share your favorite insights, best pictures, and unforgettable memories from the event. And tell us – did you manage to snap a photo with Kodee?

🏆And the winner is… On Friday, we celebrated the Kotlin community members who inspire, teach, build, and bring people together. Congrats to the winners! 👏 @matheuslf.dev, @skydoves.bsky.social, @nicole-terc.bsky.social. Eeva-Jonna Panula @eevis.codes, Yinlong Liu https://kotlinconf.com/awards/

Great session from Spring Developer Advocate @starbuxman.joshlong.com on “Bootiful Kotlin”, showcasing how Kotlin and Spring Boot complement each other to make JVM development more concise, expressive, and enjoyable.

In his "Evolving Language Defaults" talk, Michail Zarečenskij, Lead Language Designer for Kotlin, explored what happens when the “right” defaults in a programming language stop being right, and how modern languages continue evolving around safety, convenience, and practicality.

Alejandro Serrano Mena explores the design trade-offs behind Kotlin’s new context parameters feature, offering practical guidance for library authors and API designers navigating receivers, extensions, and the “spotlight principle”. Watch it live! https://kotl.in/3g9jmy

Day 1 of #KotlinConf26 was one to remember! From insightful sessions and great networking to coding challenges, meeting our partners, and connecting at the JetBrains booth, there was always something happening between sessions. Thanks for being a part of it!

A big thank-you to Xebia for joining #KotlinConf’26 as a Bronze Partner! Stop by their booth to discover how Xebia helps organizations drive innovation through AI, data and cloud modernization, intelligent automation, and digital platform engineering.

Urs Peter explores eval-driven development, a practical approach to testing and improving agentic systems through metrics, continuous evaluation, regression detection, and real-world feedback loops using Koog. Live at: https://kotl.in/3g9jmy ‎

🎉 The KotlinConf’26 Opening Keynote was packed with exciting news! Highlights included the Kotlin Toolchain, official Kotlin support for Visual Studio Code, the next-gen of AI tools for Kotlin development – and this is just the beginning! ➡️ https://kotl.in/conf26-higlights

Thanks to Moderne for supporting #KotlinConf’26 as a Bronze Partner! Drop by their booth to learn how Moderne and OpenRewrite help teams modernize codebases with tools that enable safe, automated, large-scale code changes.

Thanks to @sentry for supporting #KotlinConf26 as a Bronze Partner! Visit their booth to see how Sentry helps developers debug, monitor, and fix issues faster.

Marat Akhin explores how value semantics in Kotlin can lead to safer, clearer, and more maintainable applications, while addressing the performance and design trade-offs developers face. Join us live! https://kotl.in/3g9jmy

A big thanks to #KotlinConf26 Silver Partner @gradle! Stop by their booth to learn how Gradle Build Tool and Develocity help teams speed up builds, troubleshoot faster, and improve developer productivity.

Huyen Tue Dao explores recent and upcoming Kotlin features, examining the ideas, design decisions, and implementation details shaping the language, and what they mean for everyday development. Watch live: https://kotl.in/3g9jmy

We loved seeing you all at the #KotlinConf26 party last night! We hope you had as much fun as we did, and we’re even happier to see you again today for more Kotlin, learning, and great conversations!

A special thanks to Uber for supporting #KotlinConf’26 as a Silver Partner! Visit their booth to learn how Uber’s platforms for mobility, delivery, and freight help connect millions of people and businesses in cities around the world.

A big thank you to #KotlinConf26 Bronze Partner @Kotzilla_io! Visit their booth to meet the creators of Koin and learn about their tools that help Kotlin developers debug and resolve complex application issues.

Good morning, #KotlinConf26! Day 2 starts at 9:00 am CEST with Lena Reinhard’s inspiring keynote We Were Meant To Be. Tune in live: https://kotl.in/3g9jmy

Have fun at the party, but don’t sleep in! Tomorrow at 9:00 am CEST, we’re kicking off with Lena Reinhard’s keynote talk We Were Meant To Be. Join us live: https://kotl.in/3g9jmy

A huge thanks to our Silver Partner, the Kotlin Foundation! If you’re at #KotlinConf26, stop by their booth to learn more about how they support and advance the Kotlin ecosystem.

Thanks to our Gold Partner @Google for supporting #KotlinConf26! Stop by their booth during the conference to meet the team and get your questions answered.

Kodee's here! "Day 1. The Keynote hit different. 80+ sessions. My brain is trying to index everything at once. Current status: Overwhelmed, caffeinated, and absolutely loving the chaos."

Let’s end the day right at the #KotlinConf party! After a day full of inspiring talks, new ideas, and great conversations, it’s time for fun, music, and amazing company. See you tomorrow for more learning, networking, and Kotlin!

Just one more day until we announce our Golden Kodee winners! Stay tuned, and join us tomorrow at 5:15 pm CEST!

Ben Kadel leads a journey through Kotlin’s collection toolkit, exploring ways to transform, analyze, and structure data while embracing cleaner, more expressive programming practices. Live at: https://kotl.in/llncim

Jake Wharton dives into how modern CLI applications communicate with terminals, from colors and progress bars to keyboard events, frame sync, and images, all through the lens of Kotlin and multiplatform development. Join us live! https://kotl.in/llncim ‎

There’s always something going on between sessions! Stop by the JetBrains booth during breaks for exciting demos, fun surprises, and cool things just for you. See you there!

Most AI agents fail long before production as costs grow, behavior drifts, and orchestration breaks down. Vadim Briliantov introduces Koog 1.0, JetBrains’ open-source framework for building scalable, type-safe AI agents across Kotlin, Java, JVM, and Multiplatform. Live: https://kotl.in/llncim ‎

Ready for another coding challenge? It’s live, competitive, and powered by Compose Multiplatform. Sign up at the Challenge Zone and put your skills to the test!

What if Kotlin could enforce a rule saying that certain objects can never escape their intended scope? Ross Tate explores a new approach to locality and limited lifetimes in Kotlin, enabling safer APIs, effect polymorphism, async flexibility, and more. Live: https://kotl.in/llncim ‎

Compose Multiplatform keeps raising the bar for shared multiplatform UI development. Sebastian Aigner and Márton Braun present the latest improvements in iOS performance, interoperability, accessibility, Hot Reload, unified previews, and more. Join us live: https://kotl.in/llncim ‎

Michail Zarečenskij, Lead Language Designer at Kotlin, explores how modern languages are evolving in terms of safety, convenience, and practicality – from null-safety and immutability to advanced object analysis. Watch it live: https://kotl.in/llncim

Join Josh Long, Spring Developer Advocate, for “Bootiful Kotlin” – a session exploring how Kotlin and Spring Boot together create a more concise, expressive, and productive JVM development experience. Live at https://kotl.in/llncim ‎

Don’t forget to install the #KotlinConf app! Get info on the schedule, session changes, timetables, and everything happening throughout the event – all in one place! Android: https://kotl.in/conf-android iOS: https://kotl.in/conf-iphone

KotlinConf 2026 starts in 15 minutes! Tune in to the Opening Keynote to hear the latest from the people shaping the Kotlin ecosystem, with updates spanning language evolution, multiplatform development, AI, Android, backend, tooling, and the future of Kotlin. Join us live! https://kotl.in/llncim