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

I'm a Senior Software Engineer with 10+ years building things that (hopefully) don't break in production, now expanding into AI Engineering. 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
• 🤖 Actively transitioning into AI Engineering — Claude Code, GitHub Copilot & friends are part of my daily workflow, and I'm going deeper through hands-on coursework and project work
• 🎓 Hold an M.Sc. in Computer Vision and a B.Sc. in Computer Science, both from UNLP

AI engineering toolkit:

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):

• my_profile — personal website, built with Claude, Opencode and Astro ✨
• EasyParse.CV - Utility app to parse and extract resume/cv data and sections. Implemented using SDD (OpenSpec) and claude
• monetils — a small Python lib for handling crypto and fiat currency amounts implemented with SDD (spec-kit) and claude
• sb-ecom — Java + Spring Boot e-commerce learning project fully implemented with AI assistant tooling
• mint - Mint audits legacy CSS files - I was working as a collaborator in this novel project of a ex teammate and friend Nadia Ujovich

• 🌐 Personal site: sebastiancastaneda.dev
• 💼 LinkedIn: in/sebastiancastaneda
• 📧 Email: castanedacs@gmail.com

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