Blog posts (English)

19/05 - What PRs know that the code does not tell

How I used AI to turn 400 pull requests and their comments into backend agentic guides that are more useful than documentation written from scratch.

24/04 - Evaluating agents is not asking whether the answer looks good

For an AI tutor, evaluation is not inspecting one answer: it is having a case battery that lets you change prompt or model without breaking what already worked.

20/02 - Executable guardrails: living policies, not pretty documents

The leap was not writing better skills, but separating process guides from content policies so agents can produce, audit and learn from human feedback.

12/02 - The 7 laws of development in an agentic world, part 2: safe operation

Part two of the series: operating safe autonomy with reproducibility, observability, guardrails, reconciliation and security.

12/02 - The 7 laws of development in an agentic world, part 1: repo constitution

Part one of the series: turning coherence into a system property through invariants, ownership and docs-first.

10/02 - AI cost is architecture too

The invoice only tells you how much you spent. Architecture starts when you know which flow, model and user consumed it.

13/01 - A technical error resolution feedback loop in GoKoan

A big mistake pushed me to build a closed loop of detection, triage, tests and safe fixes with Codex as operator.

24/12 - Biblioteca: active reading for the age of copilots

I did not build this app only to read Markdown, but to discuss it. Linear reading is no longer enough when there is an AI in the sidebar.

13/12 - How to ship a large app in 28 days without turning the code into a bonfire

Lessons from Sora for Android with Codex: AI-assisted programming does not reduce the need for rigor; it increases it.

08/12 - Warrior Path: an information diet for the inner strategist

Why I packaged a year of martial principles into an EPUB and how I use a daily information diet so those principles do not dissolve.

05/12 - Sofia and the real problem with AI tutors

Designing an AI tutor is not only about answering questions: it is about sustaining a long relationship without losing memory, trust, boundaries or judgement.

23/11 - When AI moves faster than your head

A familiar kind of day is appearing for developers working near the AI frontier: obscene productivity and a strange kind of exhaustion.

22/10 - From paper to pixel: the making of a Spanish learning app

How I turned handmade flashcards into Vocabulario, a living app for learning Spanish through levels, practice and a 3D mascot.

18/10 - What AI Taught Me About Myself… That I Didn’t Know I Knew

Collaborating with an AI turned writing into a cognitive mirror that revealed my mental grammar, internal rhythms, and the limits of my voice.

17/10 - Pragmatic ranking: heuristics, a cheap LLM and deterministic validation

Choosing a recommended resource should not be generative magic: if it does not solve the reader's real problem, it is better to recommend nothing.

13/10 - When Text Sounds Like Me, I Understand It Better

A personal experiment with texts adapted to my own voice that explores how stylistic congruence improves comprehension without falling into the illusion of f...

12/10 - Remembering Cellular Youth

Epigenetics as the interpreter of DNA and how partial reprogramming opens the door to rejuvenation without erasing cellular identity.

11/10 - Distributed Rule Wiki – An Idea Clarified by AI

After years of thinking about a Wikipedia of logical rules, a push from AI turned my scattered notebooks into a crisp specification.

10/10 - Sport Planner - Plan training sessions with a reusable catalog

Sport Planner adds Supabase login and cloud sync so training plans remain available across devices while preserving offline-first use.

19/09 - Product feedback loops: from loose opinions to decisions

Not all user feedback is an opinion: sometimes it is a possible editorial correction, and sometimes it is a product signal that needs context.

04/07 - A Paradigm Shift in Programming

English translation of my 2025 reflection on how AI coding assistants reshaped my daily workflow.

21/06 - MyJournalGenerator - Personalized AI-powered journal generator

A tool to generate personalized journals from philosophical traditions, life roles and central goals.

15/06 - DreamLoop - Personalized 30-day storytelling powered by AI

DreamLoop is an interactive web app where dream messages guide a teenager's 30-day adventure and help rewrite identity through story.

RunLog Pro - Personalized training plans

30/08 - Build Your Own AI Personal Assistant (Tutorial)

A tutorial where we create a personal AI assistant that learns from you, can proactively remind you of things, and is accessible from Telegram.

09/05 - Useful RAG is not just embeddings

Sometimes the best retrieval strategy is not to look for similar chunks, but to use a candidate index and fast models to decide what is worth reading.

01/01 - The Coming Crisis of Purpose

What follows is an opinion piece, an exploration of ideas about the impact of AI that I find important in the medium and long term.

15/11 - Vert.x 3 + Kotlin tutorial for a REST API with a JDBC backend

A step-by-step tutorial to publish an asynchronous REST API using Vert.x 3, Kotlin and JDBC.

01/04 - Today I start a new job position at Akamon Entertainment

I moved from Indra S.A. to Akamon Entertainment as a backend engineer.

22/10 - Plain Knowledge Base

An experiment in representing linked knowledge as plain text.

20/12 - Won the Indra +Ideas second prize

Second prize in Indra +Ideas with a cloud prediction services project for healthcare.

01/12 - WAM - Web Application Maker

A web UI framework for developing complex business applications before modern Java web UI frameworks existed.

01/08 - OQL / JEC - Object Query Language / Java Expression Compiler

Java frameworks to traverse object memory structures, used in view frameworks such as WAM.

01/02 - WebImmersion - A new kind of WWW

A deep dive into the 2000 WebImmersion whitepaper, a vision for an object-oriented, immersive web.

01/07 - Mobile Agents on the Internet - Aglets SDK (III) (EN)

This is the final article in a 3-part series about mobile agents.

01/06 - Mobile Agents on the Internet - Aglets SDK (II) (EN)

This is the second article in a 3-part series about mobile agents.

01/05 - Mobile Agents on the Internet - Aglets SDK (I) (EN)

This is the first article in a 3-part series about mobile agents.

01/12 - Java Technology (III) – Implementing and Running the JVM (EN)

Final article in the 1997 series, translating my walkthrough of Sun's JVM data structures, class loading process, and execution model.

01/11 - Java Technology (II) – Inside the JVM (EN)

Second article in the 1997 RPP series, translating my deep dive into the .class file format, bytecode set, and the design goals of the JVM.

01/10 - Java Technology (I) – Understanding the Platform (EN)

First article in my 1997 RPP series explaining why the Java Platform matters, how the VM and APIs fit together, and where Java was headed at the time.

01/11 - Programming Pseudoconcurrent Processes (EN)

My second RPP article explored how to fake multitasking under DOS by multiplexing lightweight "tasks" in C++.

01/04 - 256,000 colors on your VGA (EN)

Reverse‑engineering VGA memory tricks to push past the 256-color barrier in 1996.

09/06 - Rotary Valencia physics prize (1995)

How a student science project turned into my very first award.

28/07 - GSF - Physical Systems Generator

A small C engine from 1994 to simulate particle systems and explore Feynman's ideas.