Simon Vergauwen
@vergauwensimon.bsky.social
Developer Advocate @ JetBrains
#Kotlin since 2015
@arrow_kt maintainer
#Kotlin since 2015
@arrow_kt maintainer
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...
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...
Kick-Off Belgian Kotlin User Group, Thu, Dec 11, 2025, 6:30 PM | Meetup
Hi Kotlin enthusiasts!
I am so hyped to be hosting our first BEKUG Meetup at Kunlabora.
This will be an important first time event where we'll welcome you all as members
www.meetup.com
November 28, 2025 at 9:08 AM
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...
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...
Reposted by Simon Vergauwen
🐳 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
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
November 27, 2025 at 3:01 PM
🐳 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
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
Reposted by Simon Vergauwen
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!
Amper Update, November 2025 – Extensibility Preview | The Amper Blog
Amper is an experimental, standalone build tool by JetBrains, for server-side and Kotlin Multiplatform development. Read on for the latest updates!
blog.jetbrains.com
November 26, 2025 at 3:24 PM
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!
Reposted by Simon Vergauwen
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
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
Getting Started | Building a Reactive RESTful Web Service
Learn how to create a RESTful web service with Reactive Spring and consume it with WebClient.
spring.io
November 24, 2025 at 10:16 AM
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
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
Reposted by Simon Vergauwen
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...
More info and register here:
info.jetbrains.com/kotlin-lives...
Live Webinar -
info.jetbrains.com
November 24, 2025 at 9:14 AM
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...
More info and register here:
info.jetbrains.com/kotlin-lives...
Reposted by Simon Vergauwen
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 😉
Helping Decision‑Makers Say Yes to Kotlin | The Kotlin Blog
Want to show Kotlin’s value in plain terms? Learn how to link productivity, quality, and developer satisfaction to measurable ROI.
blog.jetbrains.com
November 23, 2025 at 7:02 AM
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.
If you're using Ktor then please consider filling the survey, and help us continue making it better.
📣 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...
Your feedback shapes the future of Ktor 🚀
Take the survey 👉 surveys.jetbrains.com/s3/05ddc3ebe...
November 21, 2025 at 9:10 AM
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.
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...
If you're passionate about Kotlin, and Spring this might be just the thing for you.
job-boards.eu.greenhouse.io/jetbrains/jo...
Kotlin Developer Advocate
Amsterdam, Netherlands; Berlin, Germany; Dubai, United Arab Emirates; Limassol, Cyprus; London, United Kingdom; Madrid, Spain; Munich, Germany; Prague, Czech Republic
job-boards.eu.greenhouse.io
November 20, 2025 at 1:39 PM
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...
If you're passionate about Kotlin, and Spring this might be just the thing for you.
job-boards.eu.greenhouse.io/jetbrains/jo...
Reposted by Simon Vergauwen
Happy to announce that #Kotlin Community Stand was accepted at #FOSDEM2026!
All Kotlin enthusiasts, see you in Brussels soon!
fosdem.org/2026/news/20...
All Kotlin enthusiasts, see you in Brussels soon!
fosdem.org/2026/news/20...
FOSDEM 2026 - FOSDEM 2026 Accepted Stands
fosdem.org
November 18, 2025 at 10:09 AM
Happy to announce that #Kotlin Community Stand was accepted at #FOSDEM2026!
All Kotlin enthusiasts, see you in Brussels soon!
fosdem.org/2026/news/20...
All Kotlin enthusiasts, see you in Brussels soon!
fosdem.org/2026/news/20...
Reposted by Simon Vergauwen
Reposted by Simon Vergauwen
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...
github.com/infix-de/tes...
November 18, 2025 at 12:31 PM
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...
github.com/infix-de/tes...
Reposted by Simon Vergauwen
⏳ There are just two weeks left to submit your talk for KotlinConf’26!
👉 sessionize.com/kotlinconf-2... 👈
👉 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
November 17, 2025 at 10:37 AM
⏳ There are just two weeks left to submit your talk for KotlinConf’26!
👉 sessionize.com/kotlinconf-2... 👈
👉 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...
@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...
Stop Bugs Before They Happen: Compile-Time Guardrails with Kotlin Context Parameters
A Non-Obvious Way To Create Compile-Time Checks For Any Kind Of Restricted Code.
blog.kotlin-academy.com
November 18, 2025 at 8:15 AM
#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...
@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...
Reposted by Simon Vergauwen
Any Ktor fans out there? We have a survey for you too!
📣 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...
Your feedback shapes the future of Ktor 🚀
Take the survey 👉 surveys.jetbrains.com/s3/05ddc3ebe...
November 14, 2025 at 9:41 AM
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...
Come and share any awesome work you’ve done with @kotlinlang.org! Good luck 👍
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
November 14, 2025 at 9:27 AM
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...
Come and share any awesome work you’ve done with @kotlinlang.org! Good luck 👍
sessionize.com/kotlinconf-2...
Reposted by Simon Vergauwen
Reposted by Simon Vergauwen
🎉 Ktor 3.3.2 is here! Explore the changelog to learn more.
kotl.in/nf86gx
kotl.in/nf86gx
WhatsNew 3.3
Kotlin Server and Client Framework for microservices, HTTP APIs, and RESTful services
kotl.in
November 7, 2025 at 10:21 AM
🎉 Ktor 3.3.2 is here! Explore the changelog to learn more.
kotl.in/nf86gx
kotl.in/nf86gx
Reposted by Simon Vergauwen
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...
github.com/infix-de/tes...
GitHub - infix-de/testBalloon: Coroutines-powered test framework providing structured testing for Kotlin Multiplatform. It is lightweight, heavy-lifting, and easy to use (like a balloon).
Coroutines-powered test framework providing structured testing for Kotlin Multiplatform. It is lightweight, heavy-lifting, and easy to use (like a balloon). - infix-de/testBalloon
github.com
November 6, 2025 at 8:41 PM
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...
github.com/infix-de/tes...
Reposted by Simon Vergauwen
📣 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...
Your feedback shapes the future of Ktor 🚀
Take the survey 👉 surveys.jetbrains.com/s3/05ddc3ebe...
November 6, 2025 at 9:15 AM
📣 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...
Your feedback shapes the future of Ktor 🚀
Take the survey 👉 surveys.jetbrains.com/s3/05ddc3ebe...
Reposted by Simon Vergauwen
@chrzanowski.info's Kotlin Notebook featuring IntelliJ Platform code: gist.github.com/hsz/cc66e84f...
JetBrains Plugin Developer Conf.ipynb
GitHub Gist: instantly share code, notes, and snippets.
gist.github.com
November 5, 2025 at 11:58 AM
@chrzanowski.info's Kotlin Notebook featuring IntelliJ Platform code: gist.github.com/hsz/cc66e84f...
Reposted by Simon Vergauwen
There's less than a month left to submit your talk ideas to KotlinConf 2026! Why not do it today?
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
November 3, 2025 at 4:07 PM
There's less than a month left to submit your talk ideas to KotlinConf 2026! Why not do it today?
Reposted by Simon Vergauwen
🏦 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...
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...
Kotlin in Payment Gateways and Fintech — A Strategic Fit for 2026 Architectures
Kotlin isn’t just a developer preference — it’s becoming a business strategy. For fintech, it means safer money flows, faster audits, and…
yurigeronimus.medium.com
November 3, 2025 at 4:16 PM
🏦 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...
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...
Reposted by Simon Vergauwen
There's also a new beta Gradle plug-in to simplify the configuration of Arrow Optics arrow-kt.io/community/bl...
Arrow Optics for Gradle in beta | Arrow
In order to unlock the full power of Arrow Optics, lenses and prisms for your
arrow-kt.io
November 1, 2025 at 4:20 PM
There's also a new beta Gradle plug-in to simplify the configuration of Arrow Optics arrow-kt.io/community/bl...
Reposted by Simon Vergauwen
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
- Raise with context parameters
- More DSLs for concurrency,
- "At most once" for Eval,
- New integration with Result4k
Arrow 2.2.0 | Arrow
Arrow 2.2.0 is out, with improved and new functionality.
arrow-kt.io
November 1, 2025 at 4:20 PM
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
- Raise with context parameters
- More DSLs for concurrency,
- "At most once" for Eval,
- New integration with Result4k
Reposted by Simon Vergauwen
Finding Order in the Mayhem: A Novel Concurrency Testing Tool that Improved the Kotlin Compiler https://lobste.rs/s/xkziyp ##testing ##kotlin
Finding Order in the Mayhem: A Novel Concurrency Testing Tool that Improved the Kotlin Compiler | The Research Blog
At JetBrains Research we built LitmusKt — a novel concurrency testing tool for Kotlin’s unique mix of JVM, Native, and JavaScript backends.
blog.jetbrains.com
October 31, 2025 at 3:00 PM
Finding Order in the Mayhem: A Novel Concurrency Testing Tool that Improved the Kotlin Compiler https://lobste.rs/s/xkziyp ##testing ##kotlin