Willem Jan Glerum
Willem Jan Glerum

Willem Jan Glerum

Principal Software Engineer at Lunatech, based in Delft.

Started on the JVM with Scala, Play and Akka, building reactive systems. These days I work on cloud-native applications with Quarkus and modern Java. My talks tend to circle around two themes: concurrency, where the trade-offs between reactive programming and virtual threads are still being worked out, and AI agents, where Quarkus LangChain4j and friends meet the realities of OIDC, guardrails and tool calling.

Off-keyboard you'll find me volunteering at Scouting events or somewhere outdoors.

Find me

Want to invite me to speak, or run a workshop together? Reach out on Bluesky.