With a small, reproducible dataset in Jupyter, I compare what XGBoost actually does differently from scikit-learn's RandomForest — and why the answer isn't "which one is better" but "which problem is this for."
Sep 16 2026 · 8′ · Tutorials · machine learning · python
Pasting a Claude or DeepSeek API key straight into your code "just to test it quick" leaves a trail in your git history and your logs. A no-nonsense guide to environment variables, rotation, and what to check before sharing a repo.
Sep 09 2026 · 7′ · Tutorials · nextjs · anthropic
Why Jupyter is still the de facto standard for exploring data, even though versioning it with git will make you want to smash your keyboard.
Sep 05 2026 · 5′ · Experiments · python · data science
I confused revalidatePath with revalidateTag on a small project and ended up invalidating pages that had nothing to do with the change. Here's the real difference between the two cache granularities in Next.js 16, with a decision checklist.
Sep 04 2026 · 7′ · Tutorials · Next.js · React
DeepSeek Reasonix shows up as a native coding agent with aggressive caching and low cost. Before you adopt it or dismiss it, there's a more useful question: what specific problem does it actually solve in a real stack, and what reproducible experiment confirms that?
Sep 03 2026 · 9′ · Opinion · LLM · ia
Cline lets you auto-approve every action the agent takes without asking permission. The button exists. The question is why, as an architect, I'd rather not touch it — and what hidden cost total autonomy has in a real codebase.
Sep 02 2026 · 7′ · Tutorials · AI agents · arquitectura de software
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
Timescale's TigerFS exposes PostgreSQL through a filesystem interface. The previous article confused it with TigerBeetle; that interpretation is withdrawn.
Aug 22 2026 · 2′ · Tutorials · rust · sistemas distribuidos
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
Architecture, real systems, product decisions and technical lessons. Everything reviewed with my own judgment before it ships.
235 articles published