@matkar
Account based inSweden
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Jfokus founder, Java Champion, JUG leader, Software Vagabond, Family father, Motorcyclist & Kiva supporter. Check out @jfokus
Stockholm
Joined March 2009
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AI agent demos are easy.
Production is hard.
@henrikkniberg is speaking at AI-fokus 2026 about agents beyond the prototype - what works, what breaks, what we’re learning in practice.
May 19 · Stockholm Waterfront
Blind Bird until March 1
ai-fokus.se/
🎨 The Renaissance Developer with Kevin Azijn & Adriaan de Jonge.
Spec-driven, AI-powered development that helps Java devs build safer, faster, and better — without vibe coding.
👉 jfokus.se/
#Jfokus #DeveloperConference #Java #AI #Architecture #SpecDriven
Mattias Karlsson retweeted
⚙️ Make Your Code Parallel with the Structured Concurrency API with @JosePaumard (Oracle).
Tame the threads and command concurrency like a true Java craftsman ⚡
👉 jfokus.se/
#Jfokus #DeveloperConference #Java #ProjectLoom #StructuredConcurrency #VirtualThreads #Concurrency
Merlin!
⚙️ More Action, More Overview – From 4K to 1M Threads with Merlin Bögershausen (Moderne Inc).
Harness the power of virtual threads in Java 21+ and run a million tasks without breaking a sweat ⚡
👉 jfokus.se/
#Jfokus #DeveloperConference #Java #VirtualThreads #Concurrency #Performance
Sign up for the Spring webinar
🚀 Join the next #Jforum meetup hosted by @Advania!
Learn how to build a continuous upgrade culture with Spring Application Advisor 🌸
🗓 Monday 20 October 15:00 - @dashaun, Spring @Broadcom
More info and registration: jforum.confetti.events/using…
#SpringFramework #Java #DevOps #SpringBoot #Developers #Webinar
Mattias Karlsson retweeted
Full house at Oracle Stockholm for Jforum today about Java 25! The Java community is alive in Stockholm ☕ 😎 👏 with
@matkar, David Simms, Antón Seoane Ampudia, Paul Hübner, Joel Sikström and Roberto Castañeda Lozano #community #javaforum #stockholmdev
Mattias Karlsson retweeted
🔥 The new Jfokus 2026 website + 20th anniversary theme drops in just a few days!
Throwback to last year’s keynote ending with Valhalleluja 🎶 — and yes, Nanowar of Steel’s bass player Edoardo Carlesi was on stage and gave a session!
#Jfokus #Valhalleluja
🎥 youtube.com/clip/Ugkxb-NXr-c…
👉 Talk: youtube.com/watch?v=pMGoTtKH…
Mattias Karlsson retweeted
Spotlighting more of the rockstar speakers who shaped Jfokus 2025 🙌
We’re now opening the stage for 2026 — will it be you next year?
👉 Submit your talk: jfokus.se/iamahero
ALT Rockstar speakers at Jfokus 2025
Have you submitted yet?
Jfokus isn’t just about code. It’s about energy, inspiration, and sharing knowledge 🎸 🔥 ❤️
👉 This year, you can be part of it — not only in the audience, but on stage. Our Call for Speakers 2026 is now open!
Submit here: jfokus.se/iamahero
#Jfokus #CfS #CallforSpeakers #TechConference
Mattias Karlsson retweeted
Excited to speak at JForum tomorrow, in super Stockholm, Sweden, and to see friends old (hi @matkar Neven @laytoun ) and new!
jforum.confetti.events/jforu…
Mattias Karlsson retweeted
Top Java conferences you should attend in 2025..............
Link:
unlogged.io/post/top-java-co…
Closing 2024 with a leap of fait. Jump into 2025 with some fear, but hope for the best. Fear Less, Live More.
Happy New Year!
Closing 2024 with a leap of fait. Jump into 2025 with some fear, but hope for the best. Fear Less, Live More.
Happy New Year!
1000 Days of resistance.
#StandWithUkraine
min.sverigeforunhcr.se/fundr…
Mattias Karlsson retweeted
Breaking into AI applications to learn how to make them more secure, looking forward to giving this talk at @Jfokus together with @BrianVerm
@LizeRaes and @BrianVerm will tackle "Securing LLM-Powered Applications: Overcoming Security and Privacy Challenges" at Jfokus 2025! Learn strategies to address security risks in AI-driven applications.
#Jfokus2025 #Security #AI #LLM
Mattias Karlsson retweeted
Alexander Chatzizacharias @alex90_ch will push boundaries with "Let’s Use IntelliJ as a Game Engine, Just Because We Can" at Jfokus 2025!
Join for a fun and unconventional approach to IntelliJ usage.
#Jfokus2025 #IntelliJ #GameDev #Programming
jfokus.se/talks/2016
