We started using event sourcing over ten years ago. One of the hardest lessons was that there is a kind of events that is not obvious at first but have a big impact on your system design. I call this kind secondary domain events.
https://www.planetgeek.ch/2026/04/01/the-problem-with-secondary-domain-events-in-event-sourcing/

#EventSourcing

I recently talked with @bbelderbos about #eventSourcing, #dataStar, and other thoughts that have transformed how I write code today.

https://www.youtube.com/watch?v=8aQ7j8mz5Ug

More live coding #Java and #EventSourcing:

I dealt with "external" and "parameter" validation (I didn't implement the third type: "internal" validation) of scheduling conflicts for Concerts.

I also pondered minimal consistency boundaries.

Notes are at: https://ted.dev/articles/2026/03/24/live-coding-journal-mar-24-2026/

Slides from my talk at Glasgow PHP meetup today. https://speakerdeck.com/super_marek/mastering-event-sourcing-your-parents-holidayed-in-yugoslavia

#GlasgowPhp #ScotlandPhp #eventsourcing #meetup #PHP #Symfony #Laravel #diy #handcrafted #aviation

Back to streaming, with notes from yesterday's stream: https://ted.dev/articles/2026/03/23/live-coding-journal-mar-23-2026/

I chatted about consistency boundaries, missing-event heuristics, and encoding (serializing) events.

#EventSourcing #Java #TDD

Event Storming on sticky notes, then straight into code.

Oliver Zihler and Alina Liburkina run a hands-on workshop at DevOpsDays Zürich 2026. Build an event-sourced domain model with Axon Framework and Kotlin.

CQRS, DDD Aggregates, Commands, Domain Events, Projections, and event versioning. All in one session.

https://www.devopsdays.ch/event/program/workshops/oliver-zihler/

#DevOpsDays #DevOps #DDD #EventSourcing