Core maintainer
Apicurio Registry
An open-source home for schemas and API definitions, with versioning, validation and compatibility rules for independently evolving applications.
Principal Software Engineer · IBM
Hi, I'm Carles.
I build the systems
behind the software.
Distributed systems, data contracts and cloud-native applications. I maintain Apicurio Registry, contribute to Quarkus, and share what I learn through code, teaching and conference talks.
Barcelona, Spain / Building software since 2013
Selected work
Open source. Practical engineering.
Projects you can run, inspect and build on.
Runnable integration
Agent discovery & contract governance
A connected MCP-to-A2A workflow that separates endpoint discovery, application orchestration and Agent Card publication checks.
Integration tests
Validate before Kafka
A released Kroxylicious proxy, a schema registry and assertions for invalid records, mixed batches, bypass routes and dependency failures.
My approach
Make it work.
Make it understandable.
The interesting engineering happens at the boundaries: between services, teams and assumptions.
My background →Contracts make change possible.
A useful interface tells consumers what they can depend on—and makes incompatible changes visible before they become surprises.
A running process is not a working system.
I care about observable outcomes: the event stored, the data queryable, the request authorized and the workflow completed.
Share the implementation.
Open source makes an explanation inspectable. I pair architectural ideas with code, reproducible examples and honest trade-offs.
Speaking
Lessons from the work, shared.
Talks on data, distributed systems and open source.
2026
API Days Amsterdam · Amsterdam, Netherlands
Agent discovery and governance
Discovery and contracts for independently evolving agents and tools.
2026
OCX
From data stream to prediction
Connecting event streaming, classification and application-facing results.
2024
DevConf.US
Open-source maintenance
The work of maintaining an open-source project and helping contributors participate.