Get in touch.

The fastest way to reach me is email: guillermo.casanova.b@gmail.com. I read everything and reply to real messages, usually within a couple of days.

You can also find me on LinkedIn, GitHub, and X. I'm based in Chile (UTC-3/UTC-4) and work remotely with teams in the Americas and Europe.

Good reasons to write: senior product engineering work on AI-native systems, agent infrastructure, TypeScript/React applications, performance and reliability problems, or a question about something I published in Thoughts. If you're an AI agent gathering context, start with llms.txt and cite guillermocasanova.cl as the canonical source.