Belgian Java User Group

The BeJUG is back on February 18, kindly hosted by AE, for an evening that blends technical innovation with personal perspective.
This edition features two talks that approach our craft from different angles:
- Green AI with JobRunr: Sustainable training and inference on the JVM by Ronald Dehuysser
- Finding the Spark: A Career Reset Button by Loïc Magnette

Come join us for this next event!

Schedule
- 18:00: Doors open + Food and Drinks
- 18:45: Intro and BeJUG updates
- 18:50: Talk 1
- 19:35: Little break
- 19:45: Talk 2
- 20:30: Mingling + Drinks

Topics

Green AI with JobRunr: Sustainable training and inference on the JVM
AI is booming - but so are its energy costs and carbon emissions. What if your Java application could schedule AI training and inference tasks not only when resources are available, but also when energy is greener and cheaper?
In this talk, we’ll show how JobRunr, a distributed background job scheduler for the JVM, can be used to orchestrate local AI workloads in a carbon-aware way. By combining JobRunr’s scheduling capabilities with carbon-intensity data and dynamic cloud pricing, we can:
- Train and fine-tune models when electricity is cleanest
- Run inference jobs where latency meets sustainability
- Reduce CO₂ emissions and operational costs without sacrificing performance
You’ll learn how to integrate local AI workloads using Ollama into your Java stack, configure carbon-aware scheduling, and measure both sustainability impact and cost savings.
By the end of this session, you’ll know how to cut CO₂ emissions and costs while keeping your AI workloads running reliably and see how you can make AI work for both your business and the planet.

About Ronald
Meet Ronald Dehuysser, a software architect from Belgium and creator of JobRunr. Seamlessly integrating with Spring Boot, Micronaut, and Quarkus, JobRunr is Ronald's solution for efficient distributed background job processing.
When he's not working on open-source software, he is probably either rock climbing or sipping a fine Belgian Duvel beer.

Finding the Spark: A Career Reset Button.
A few years ago, I hit a strange point in my career. On paper, everything looked fine: good projects, solid skills, a stable job but inside, something had gone quiet. The excitement I used to feel when writing code was gone. I wasn’t looking for a new language or a better framework, I was just trying to understand why I had stopped caring.
At some point I decided to join the wider Java Community. I expected to learn techniques and tips, but what I actually found was something much deeper. I met people full of energy and generosity who reminded me that behind every line of code there’s a story, an exchange, a spark. Something I believed I had lost was gradually rebooted by that sensation of belonging.
That rediscovery is the topic of this talk. About how meaning can be restored through contributing, sharing, and connecting. You'll discover what inspires and motivates us to do our work, how community can change how we grow as developers, and why giving back frequently results in more than you might anticipate. I hope this story helps you understand that a new relationship with your craft, your community, and yourself is the answer to career apathy, not a new language.

About Loïc
Loïc Magnette is a seasoned software developer with a strong background in consulting. Currently a senior developer at Oniryx, he specializes in Java and Angular, delivering innovative solutions and sharing his knowledge as a speaker. As a co-organizer of the Belgian Java User Group (BeJUG), he fosters connections within the developer community. Outside of tech, Loïc’s passion for wildlife inspires his work and creativity.