Tools & technologies
LLM applications
RAG over documents, agents that query data and applications built on language models, with the evaluation needed to know whether they actually work.
RAG over documents, agents that query data and applications built on language models, with the evaluation needed to know whether they actually work.
Retrieval that cites its source
Indexing, semantic retrieval and answers that cite the document they came from. The goal is for every answer to be verifiable, not just to sound good.
Agents with guardrails
Agents that translate natural language into queries and run them read-only, with bounded tools. Useful without being dangerous.
Operating locations
Studying in Madrid
Based in Madrid, learning in public: projects, open-source tools and collaborations, inside and outside Spain.
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Decision flow
Answers with citations.
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Friction map
Evaluated, not just demoed.
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Journey shape
Bounded tools.
Next projects:
MLOPSFASTAPIDOCKERMONITORING
Credit Risk Platform
End-to-end MLOps platform for credit-default scoring: reproducible training with a versioned model registry, a FastAPI inference API with input validation, PSI drift monitoring and a Prometheus and Grafana observability stack, all containerised with CI. Code at github.com/delcenjo/credit-risk-platform.
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PYTORCHTRANSFORMERSNLP
Transformer from scratch
A GPT-style language model implemented from scratch in PyTorch: multi-head attention, causal masking and residual blocks written by hand, plus a byte-pair tokenizer and an ablation study. Code at github.com/delcenjo/transformer-from-scratch.
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NEXT.JSWEBASSEMBLYCLOUDFLARECI/CD
This very site
This portfolio is hand-built with Next.js and deployed on Cloudflare Workers, with a model lab that runs entirely in the browser and continuous deployment on every commit. Code at github.com/jmweb-org/jmweb-pag-web.
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SCIKIT-LEARNCALIBRATIONTABULAR
Credit Risk Model
Credit-default risk model with rigorous evaluation: a leakage-free pipeline, cross-validated model comparison, calibrated probabilities, a cost-based decision threshold and per-segment error analysis. Code at github.com/delcenjo/credit-risk.
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