Projects

pisopropio.es

A tool for Spain's protected-housing market (VPO/HPO). It tells you which offers you qualify for, what they cost, when they close and your real odds. It combines an eligibility engine built on the official rules with an offers feed that gathers scattered public sources: 440 monitored offers across 16 regions from 39 official sources, plus 16 guides. Spanish, Catalan and English. Built with TanStack Start, tRPC, Drizzle, PostgreSQL and AI-assisted extraction.

seehowaiworks.com

An interactive course on how modern LLMs actually work, with no code and no videos. Every lesson is a widget where you predict first and then see the mechanism: from 'a word is a vector' through attention, transformers, scaling, RAG and agents, down to the GPUs underneath. 99 lessons, plus a free library of explainers and standalone widgets. English and Spanish. Built with React, TanStack Router, Tailwind, tRPC, Drizzle and PostgreSQL.

cascadepuzzle.com

A free block-swapping puzzle in the Panel de Pon and Tetris Attack lineage. One daily board with a proven move limit, an archive of every past day, a campaign, a level editor and an online versus mode with rollback netcode. Runs in the browser, no download, no ads. Built with Phaser 3, React, tRPC and PostgreSQL.

prompt.fcarril.com

A PWA that lets you build AI prompts without typing a single word. Designed for non-technical users and older adults: pick a category, a task and modifiers, and the app generates a ready-to-use prompt you can copy or open directly in ChatGPT, Claude or Gemini. Built with TanStack Start, Drizzle, PostgreSQL and Zustand.