Frameworks and Databases¶
Once you're ready to try this architectural approach yourself, the next question is: How do I start building?
While CQRS and Event Sourcing are not tied to any particular technology, choosing the right tools can make implementation significantly easier.
Here are two components you can use to get started.
EventSourcingDB – A Database Built for Event Sourcing¶
EventSourcingDB is a specialized database that acts as event store and message bus in one.
It was built specifically to support:
- Reliable storage of immutable events
- Transactional publishing of events to subscribers
- Projections with built-in indexing and filtering
- Time-travel, replays, and full history retention
Unlike general-purpose databases, EventSourcingDB is focused on domain-driven, event-centric design – with features tailored to event-sourced systems from the ground up.
A great fit when event-driven architecture is central to your application.
OpenCQRS – A CQRS Framework for Java and the JVM¶
OpenCQRS is a lightweight, opinionated framework for building applications based on CQRS and Event Sourcing.
It helps you:
- Structure your application around commands, events, and aggregates
- Separate write and read models cleanly
- Handle event persistence, publishing, and projections
OpenCQRS is designed to be modular and extensible, making it a good fit for real-world applications – from prototypes to production.
Ideal if you're building in Java, Kotlin, or any other JVM-based language.
Next up: Not sure how to apply all this in your team or project? Check out our Consulting and Workshops to see how we can help.