About Me
I'm Xabier, 19, second-year AI Engineering student at Universidad Francisco de Vitoria, Madrid. For the last few months I've been shipping agentic systems to production — Salesforce sales agents, MCP servers with security review loops, Android field assistants, multilingual institutional tooling.
Now I'm pivoting to research. Working on my first empirical paper: an ablation study of agent-harness components. This site is the public notebook.
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Four kinds of posts. Pick the one that sounds most like you.
Tech deep-dives
Rigorous explanations of LLM internals, transformers from scratch, mech interp, eval methodology. Depth before speed.
Research notes
Work-in-progress on the harness-ablation paper. Hypotheses, design choices, and null findings included.
Production lessons
Honest case studies from systems I've shipped, including the expensive mistakes — auth bugs, fake crypto, the works.
Meta journey
Reflections on pivoting from production to research at 19, ARENA progress, and the honest self-critique that comes with it.
Notebook
Short-form entries that don't earn a full post yet: paper notes, TIL fragments, half-finished thoughts I want timestamped before I forget them.