Alex Castillo Gonzalez

I built and deployed Churrería Calderón’s business website and an embeddable AI chat widget that answers customer questions using the business’s own information. I’ve turned that widget into a reusable product pattern for other small businesses.

I build production-ready RAG applications end to end, including a PDF chatbot with page-level citations and real-time uploads, plus a semantic recommender powered by embeddings and feedback loops.

I’ve contributed upstream to the RuboCop ecosystem, courrier, and fenn, fixing parser and autocorrect issues, adding three email-provider integrations, and contributing a .docx loader for a Python ML/RAG library.

I also built front- and back-end features at Tecnobit and taught Ruby on Rails fundamentals at Le Wagon. I’m based in Toronto and open to remote and hybrid roles.