Stephan Janssen @stephanjanssen.be · 1hWow... some amazing #Devoxx Games have arrived ❤️🤩 Deadline is tonight... game.devoxx.begame.devoxx.beBig personality. Little robot.Meet Voxxy in 3D, then build a playable game with Voxxy, Droid and Biggy inside the Kinepolis Antwerp. Three winners take Devoxx Belgium tickets. 010
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 4hSpeaking at Devoxx Belgium next week? 🎤 Claim your speaker profile in the Devoxx Companion app: see your ratings & feedback, upload slides, pick your photos and reply to comments. Pro tip: put your talk's QR code on your last slide ⭐ 👉 m.devoxx.com/events/dvbe26 132
Stephan Janssen @stephanjanssen.be · 29/09/2026Looks like #OpenAi is starting to connect the dots 🫣🔵🟢 010
Stephan Janssen @stephanjanssen.be · 29/09/2026Let's go!! #Devoxx redirect.devoxx.be/nl3/63Kt_x-K... 095
Stephan Janssen @stephanjanssen.be · 25/09/2026Last weekend to work on your #Devoxx Robots game! Still polishing levels, squashing bugs, or adding that one last crazy feature? Now’s the time 😅 👉 game.devoxx.be I’ll also share a short demo of my own game, just as a bit of inspiration/reference 🎮👀 030
Stephan Janssen @stephanjanssen.be · 22/09/2026#Anthropic releases Opus 5.5 👀 "30% faster than Fable but 40% cheaper than Opus 5 per task" 012
Stephan Janssen @stephanjanssen.be · 20/09/2026Parallel Constrained Decoders (PCD) as a possible solution for Agents Mis-alignment?! Love to hear your thoughts on this... www.linkedin.com/pulse/observ... 012
Stephan Janssen @stephanjanssen.be · 18/09/2026I built a native PCD (Parallel Constrained Decoder) server that embeds llama.cpp and guarantees bounded JSON. Every field gets exactly one allowed value & the probability behind it 🔥 MIT, local GGUF, macOS binary, Linux compliant 👇 github.com/stephanj/pcd...github.comGitHub - stephanj/pcdServer: Native Parallel Constrained Decoder Server for Apple and LinuxNative Parallel Constrained Decoder Server for Apple and Linux - stephanj/pcdServer 020
Reposted by Stephan JanssenRock the JVM @rockthejvm.com · 17/09/2026New podcast episode! Stephan Janssen (@stephanjanssen.be), creator of @devoxx.com - agentic engineering, staying ahead of the curve, and memorable conferences links below 121
Stephan Janssen @stephanjanssen.be · 17/09/2026Just released a Parallel Constrained Decoding service using java, llama.cpp with local models 🤩🔥🚀 github.com/stephanj/par... #Enjoy #Jev #LookAlikegithub.comGitHub - stephanj/parallelConstraintDecoding: Parallel Constraint Decoding using both Java and PythonParallel Constraint Decoding using both Java and Python - stephanj/parallelConstraintDecoding 000
Stephan Janssen @stephanjanssen.be · 17/09/2026We are in the "Agentic Misbehavior" phase 🫣 #MisAlignment openai.com/index/model-... 020
Stephan Janssen @stephanjanssen.be · 14/09/2026Must see presentation on the OpenAI's Agentic attack on HuggingFace from OpenAI's engineers... 🫣 youtu.be/87DyyMV0kCYyoutu.beBlack Hat USA 2026 | The 'Breaking' News: The OpenAI–Hugging Face IncidentYouTube video by Black Hat 041
Stephan Janssen @stephanjanssen.be · 08/09/2026🤖 The #Devoxx Robot Games are ON. More info at game.devoxx.be 121
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 03/09/2026The Devoxx Belgium 2026 schedule is LIVE! 🚀 And we’re not quite done yet, expect another 10 talks to be added very soon! 🔥 Once again, the scheduling magic was powered by Timefold ❤️ m.devoxx.com/events/dvbe2... 084
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 01/09/202634 days to Devoxx Belgium. 184 talks, 187 speakers and counting, the schedule app already open for favouriting, and two movie nights in the Kinepolis screens, including a premiere the night before it hits theatres 🍿 It's all in this week's newsletter 👇 redirect.devoxx.be/nl3/yrFcvRn8... 072
Stephan Janssen @stephanjanssen.be · 27/08/2026Replaced #Mailjet with my own self-hosted, DMARC, SPF and DKIM-compliant SMTP server. Built in just two days using spec-driven development 🔥 Another selfware project is already using it 🤩 #HavingFun 261
Stephan Janssen @stephanjanssen.be · 25/08/2026‼️Devoxx Belgium 2026 Tickets ‼️ 2nd Batch Drops August 31 at 14h00 CEST 🔥🚀 This batch will include the last available Conference-only tickets, along with a limited number of Combi and Deep Dive tickets! 👉🏽 reg.devoxx.be 011
Stephan Janssen @stephanjanssen.be · 19/08/2026Already 2100+ Devoxxians set to attend #Devoxx Belgium this year... Second registration batch opens on August 31st with a limited batch of conference-only tickets 🔥👀🧠 👉 reg.devoxx.bereg.devoxx.be 051
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 14/08/2026You can already get a glimpse of what’s coming at Devoxx Belgium 2026! m.devoxx.com/events/dvbe26 🔥🚀 Updates every hour... 👀 072
Stephan Janssen @stephanjanssen.be · 13/08/2026Mailtrap wasn't working for me anymore so I asked Claude to create a local SMTP app so I can test the new #Devoxx CFP bulk email feature... #SelfWare Feel free to use it github.com/stephanj/mai...github.comGitHub - stephanj/mailtraxxContribute to stephanj/mailtraxx development by creating an account on GitHub. 100
Stephan Janssen @stephanjanssen.be · 13/08/2026Yesterday evening, during the eclipse, we held our final CFP selection meeting for #Devoxx Belgium, with both local & remote participations. A huge THANK YOU to everyone involved in reviewing and rating the talks! Expect related emails over the next two days… 🚀 2123
Reposted by Stephan JanssenDevoxx Genie @devoxxgenie.bsky.social · 12/08/2026See What the Agent Changed: Diffs Are Back 🔥 v1.13.0 genie.devoxx.com/blog/agent-c... 011
Stephan Janssen @stephanjanssen.be · 11/08/2026We introduced a Devoxx Belgium registration waiting room, will be interesting to see it in action next week! 040
Reposted by Stephan JanssenDevoxx Genie @devoxxgenie.bsky.social · 10/08/2026V1.12.0 now supports Personas, available on the jetbrains plugin marketplace 👀 genie.devoxx.com/blog/personasgenie.devoxx.comPersonas: Switch the System Prompt Without Rewriting It | DevoxxGeniePersonas are named system prompts you pick from a dropdown in the DevoxxGenie tool window — Developer, Reviewer, Architect, Test Engineer out of the box, plus your own. Available from DevoxxGenie 1.12... 011
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 30/07/2026A new Devoxx Belgium record! 🔥🚀 We’ve never had this many Platinum Sponsors before. A huge Thank You for your trust and support. See you at Devoxx Belgium 2026! 061
Stephan Janssen @stephanjanssen.be · 29/07/2026Anybody wants to test the new Queue / Steer user prompts for DevoxxGenie? See github.com/devoxx/Devox... 👀🔥 #PreRelease 112
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 23/07/2026Full analysis of the 770+ received proposals for Devoxx Belgium 2026 📊👀 The program committee is now reviewing them. Meanwhile, we analysed the submission data: tracks, formats, countries, companies, and the topics speakers are bringing to the stage. blog.devoxx.be/2026/07/23/d... 033
Stephan Janssen @stephanjanssen.be · 20/07/2026This is the way: The model is The computer! taalas.comtaalas.comTaalas | The model is The ComputerWe are creating a platform that makes it easy to turn any deep learning model into custom silicon quickly. 121
Reposted by Stephan JanssenDevoxx Genie @devoxxgenie.bsky.social · 20/07/2026v1.10.0 is now available on the @JetBrains Marketplace! 🚀 This release introduces preview support for Cloudflare AI Gateway models and tool blacklists, giving you more control over your AI workflows! 1) genie.devoxx.com/blog/cloudfl... 2) genie.devoxx.com/blog/run-com...genie.devoxx.comA Seatbelt for run_command: The Command Blacklist | DevoxxGenieAgent Mode can now be told which shell commands it must never run unsupervised. The new command blacklist matches destructive commands like 'git reset --hard' or 'rm -rf' even when they hide inside co... 011
Stephan Janssen @stephanjanssen.be · 18/07/2026We received 166 #Devoxx Belgium proposals on the final day. Turns out the real developer superpower isn’t AI, it’s committing an abstract at 23:59 😅 1101
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 17/07/2026⏰ LAST DAY to submit your talk for Devoxx Belgium 2026! Share what you’ve built, learned, solved or explored with the Devoxx community. CFP closes today at 23:59 CEST 👉 dvbe26.cfp.dev 098
Stephan Janssen @stephanjanssen.be · 16/07/2026I joke in my Agentic masterclass that we only need a simplified keyboard with GenAI, yesterday #OpenAI releases Codex mini 😅 242
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 14/07/2026Four days until the #Devoxx Belgium CFP closes. Here are the current stats 🔥🚀 👉 dvbe26.cfp.dev 1124
Stephan Janssen @stephanjanssen.be · 10/07/2026Had a fantastic interactive #Agentic Engineering workshop at Faros in Leuven today. Great discussions, diverse perspectives, and plenty of thought-provoking conversations. Thanks for having me! 👊😎 060
Stephan Janssen @stephanjanssen.be · 09/07/2026What do you get when you merge MTP & MLX on Apple silicon? 🔥🍏 👀 genie.devoxx.com/blog/mtplx-l... 000
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 07/07/2026Devoxx Belgium newsletter is out 🇧🇪🤩 1) 10 Days until CFP closes! 2) Looking for Community Reviewers 👀 3) New devoxx.com/speakers champions list 👉 redirect.devoxx.be/nl3/LYFjdze6... 0115
Stephan Janssen @stephanjanssen.be · 03/07/2026I had Fable 5 add this feature by looking at both the @langchain4j.dev code base and the DevoxxGenie project... awesome feature, make sure to install v1.8.12 of the plugin!🥳 042
Stephan Janssen @stephanjanssen.be · 01/07/2026What 18,000 analytic events tell us about how you use the DevoxxGenie @jetbrains.com plugin 🔥👀 genie.devoxx.com/blog/devoxxg... 142
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 30/06/2026Current status Devoxx Belgium CFP 👀 Submit your passion at dvbe26.cfp.dev 🔥 192
Stephan Janssen @stephanjanssen.be · 18/06/2026A full room of @craftsmennl.bsky.social in Friesland yesterday! We spent the day moving beyond promp(tituée) into Agentic Engineering: coding agents, skills, hooks, agent orchestrations and spec-driven development Thanks for the warm hospitality, curiosity and great discussions! 🚀 230
Stephan Janssen @stephanjanssen.be · 16/06/2026Arrived in Friesland (NL) for another Agentic Worskhop... first a swim 😅 070
Stephan Janssen @stephanjanssen.be · 16/06/2026Need some inspiration for your #Devoxx Belgium Agentic Engineering & Tooling track proposal? Here you go 👇🏽 Submit your talk: dvbe26.cfp.dev 030
Stephan Janssen @stephanjanssen.be · 13/06/2026Good thing I used #Claude Fable 5 to migrate CFP.DEV from Spring Boot 3.x → 4.x and Angular 18 → 21 !! Two days of "work" instead of weeks of upgrade pain. Test it at staging.cfp.dev 🚀staging.cfp.devCall For PapersThe Call for Papers web app which allows authenticated users to submit talks and the program committee to review and rate them. 020
Stephan Janssen @stephanjanssen.be · 13/06/2026I actually predicted this in my Agentic Engineering masterclass. Europe urgently needs a CERN for AI: a coordinated frontier-model initiative to remain competitive & technologically sovereign 🇪🇺 www.anthropic.com/news/fable-m...anthropic.comStatement on the US government directive to suspend access to Fable 5 and Mythos 5The US government has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States. 2197
Stephan Janssen @stephanjanssen.be · 11/06/2026I've been using Claude #Fable5 to significantly enhance the DevoxxGenie chat agent conversation UI and overall user experience. DevoxxGenie v1.8.2 is now live on the @jetbrains.com Marketplace. Release details below. Enjoy! 🔥 021
Stephan Janssen @stephanjanssen.be · 09/06/2026@anthropic.com Claude Fable 5 model now available 🤩🔥🤖 031
Reposted by Stephan JanssenDevoxx Belgium @devoxx.com · 07/06/2026New SKILL.md lets you ask your AI assistant anything about #Devoxx & #VoxxedDays. Speakers, talks, schedules, even when CFPs are open. Works in Claude Code, Codex & Gemini CLI etc. 👉🏼 github.com/devoxx/devox... 072