Architecture, real systems, product decisions and technical lessons. Everything reviewed with my own judgment before it ships.
240 articles published
gRPC solves inter-service communication with code generation and HTTP/2. It's fast, it's typed, and the learning curve is going to hurt a bit. Spoiler: it's worth it.
Oct 10 2026 · 5′ · Experiments · java · rpc
Apache Spark has been the de facto standard for processing data at scale for over a decade. We go over why it's still alive, how it works under the hood, and when you should NOT use it.
Oct 08 2026 · 5′ · Experiments · java · big data
Correction: Spring Boot 3+ hides values by default. Start with the exact version and effective show-values configuration.
Sep 11 2026 · 2′ · Tutorials · spring-boot · java
Yesterday I left a detail hanging: it's not that "something" blocks the carrier thread. There are exactly two scenarios, documented in JEP 444, and if you migrate legacy code without knowing them, pinning is going to explain why your virtual thread pool isn't scaling the way you expected.
Aug 28 2026 · 7′ · Tutorials · concurrencia · java
Spring Boot Actuator exposes more by default than most teams realize. The difference between an endpoint that's useful for monitoring and a map of environment variables handed to an attacker comes down to a decision almost nobody makes explicitly: allowlist versus disabling what looks obvious.
Aug 23 2026 · 8′ · Tutorials · spring-boot · java
Java Champion isn't an academic title or a corporate badge. It's recognition of community contribution — and in 2026, quality technical content in Spanish is an undervalued and completely legitimate contribution. My declared goal and the real criteria behind the program.
Aug 18 2026 · 10′ · Tutorials · open source · spring-boot
CAdES and XAdES aren't interchangeable even though both are "advanced signatures." The choice depends on document type, trust profile, and what the CA actually expects to validate. A technical guide with DSS and Java to make the right call before you sign anything.
Aug 12 2026 · 9′ · Tutorials · seguridad · certificados
Virtual Threads solves the cost of spinning up thousands of threads in the JVM. It doesn't solve the blocking problem when your code has synchronized blocks or blocking native calls. JEP 444 says so, but almost nobody reads it to the end.
Aug 11 2026 · 8′ · Tutorials · concurrencia · spring-boot
Actuator isn't the problem. Enabling it without a clear exposure policy is. A practical guide to using it as an operational tool without turning it into unnecessary public attack surface.
Jun 17 2026 · 8′ · Tutorials · devops · backend