Argentine 🇦🇷 living in Valencia, Spain 🇪🇸 — coding from home with good mate 🧉 and better sunshine ☀️

I'm a Senior Software Engineer with 15+ years building things that (hopefully) don't break in production. I've shipped code across FinTech, crypto, banking, government, and health-tech — from payday loan platforms to Bitcoin banks, from government treasury systems to medical apps.

• 🏠 Born and raised in La Plata, Argentina — home of UNLP, great football, and mate culture
• 🌍 Now based in Valencia, Spain, fully remote and loving it
• 🏦 Most recent work experience in @ Xapo Bank — building payment integrations and keeping crypto flowing safely
• 🤖 AI-assisted development enthusiast — I use Claude Code, GitHub Copilot, and friends daily
• 🎓 Hold an M.Sc. in Computer Vision and a B.Sc. in Computer Science, both from UNLP

Day-to-day stack:

Also comfortable with:

Observability & CI/CD:

And many more

I'm a proper university nerd — three degrees from Universidad Nacional de La Plata (UNLP):

• fa-ecom — a FastAPI e-commerce learning project with AI assistant tooling
• sb-ecom — same idea, but Java + Spring Boot (keeping the JVM skills sharp)
• cryptils — a small Python lib for handling crypto and fiat currency amounts
• hawk-eye-sim — a MATLAB toy simulating the Hawk-Eye tennis ball tracking system (the MSc. nerd in me never sleeps)
• my_profile — this very website, built with Astro ✨

• 🌐 Personal site: sebastiancastaneda.dev
• 💼 LinkedIn: in/sebastiancastaneda
• 📧 Email: [email protected]

Open to senior engineering or tech lead roles on high-impact distributed systems. Let's build something great together.