Sebastian López
AI Engineer
I build AI that’s actually useful, not just impressive.
Today I build AI tools for NGOs, cooperatives and small associations: automating workflows, giving access to localized knowledge through RAG, and letting people interact with technology by voice.
I’m open to AI Engineer and Agentic AI opportunities in Barcelona or with remote teams across Europe.
Projects
Migrant Archive — Narratives That Resist
Multimodal RAG agent over migrant narrative archives: YouTube ingestion, transcription, Gemini embeddings, ChromaDB vector search, LangChain tool-calling, FastAPI, voice input, and an embeddable multilingual chat widget.
dotanote — Speak Instead of Type
Voice-to-text notes built for my mother, who has arthritis and finds typing painful. Runs on the Gemini API or the browser's Web Speech API; Magic Format and a multi-provider orchestrator with circuit breaker and failover are my LLM engineering experiments.
Margaret Hamilton — Alenia × Ayvens Hackathon
Team lead at the Alenia AI Ticketing Challenge (Ironhack, Madrid). A LangChain agent on Databricks (Llama 3) that reads OpenProject tickets, proposes evidence-backed solutions, updates their state in the database, records every change and emails the delegates each solution concerns — with human approval before any write.
Almas Brasileiras
Multilingual website for a samba school, built with Next.js, React, TypeScript and Tailwind CSS, deployed to Cloudflare Workers. SEO, automated tests and CI/CD with GitHub Actions and Cloudflare.
Voice Agent — Live Demo
Voice agent integration with Vapi and Deepgram. Winner of the 2026 Vapi Challenge.