Event Sourcing

Articles about Event Sourcing by Sebastian Bergmann

The image shows a close-up of printed financial data on paper, with multiple vertical columns of numbers in black, green, and red ink representing values such as prices or changes. A metallic pen lies diagonally across the sheet, suggesting analysis or review of the numerical information.

February 25, 2026

Replay Testing

Replay Testing leverages the memory of your event sourcing system to test new versions with real history and shows which oracles truly inspire confidence in your changes.

The image illustrates that valuable insights can be gained from recorded events through skilful processing and analysis, a metaphor for the value of event sourcing and automated testing in software development.

February 20, 2026

From Events to Insights

Event Storming, DDD, CQRS, and Event Sourcing are intertwined: the tests not only check the events, but also become living documentation and a bridge between technical expertise and code.

February 11, 2026

How my understanding of software changed

A classic database only stores the "now" and forgets history. In this article, I describe my journey to DDD and event sourcing and explain why we need to learn to model time itself.

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