Ernesto González
/2t0rFull Stack Engineer
I build systems that work — not just today, but six months from now.
Who I am
I'm a CS student at Universidad Carlos III de Madrid and a working full-stack engineer. I've been building software for clients for a couple of years — not side projects, real systems with real users, transactions, and production requirements. I think that changes how you write code. You stop caring about cleverness and start caring about correctness, scale, and what breaks first.
How I work
When I take on a project I don't just write the feature list. I ask what will fail when traffic spikes, what the attack surface looks like, how the data model holds up at 10× scale. I read the codebase before I open a PR. I think about the person who'll maintain this in a year. That habit comes from working with clients who depend on the software — if something goes down at 3am, it's not abstract.
What I've built
A live-commerce platform integrated into TikTok Live where registered users buy products by typing keywords in real-time chat — with a StreamDeck-connected management panel, prepaid bonus system, and inventory sync. A SaaS that generates professional quotes through a chatbot, exports to PDF, and handles magic-link signing. A personal finance app with biometric auth and E2EE cross-device sync. Landing pages and Shopify stores for companies in Germany and Spain, including an automated catalog extraction pipeline. The common thread: systems that run.
What I use
TypeScript, React, Next.js for the frontend. Node.js and Python for the backend. PostgreSQL as my default database, Redis when I need it. Docker everywhere. Kubernetes and AWS when the project demands it. LangChain and the OpenAI and Anthropic APIs for anything involving LLMs — which is increasingly everything.
What I'm looking for
I'm open to freelance projects, internships, and collaborations. What matters to me is that the work is real — a product with users, a problem worth solving, a team that takes craft seriously. I don't filter by industry or company size. I filter by whether the work is interesting.