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juan@laptop:~$ whoami
Hello, I'm Juan
I'm an electronics and systems engineer from Bogotá, Colombia. I lead AI and engineering at Creceré, where we build CreditBay — a debt-recovery platform where AI voice agents make the calls. Before that I did ML research at Cornell and Universidad de los Andes.
Off the clock it's a 3D printer, a riced Hyprland desktop, and software and hardware for biologists who study hummingbirds.
now
- Parity-test the RFID pipeline New Polars core checked against 5.4M rows of legacy output.
- Offline launchers for biologists Double-click on Windows or Linux. No terminal.
- This site Monospaced, colorful, and on its way to jreyes.dev.
how I work
- Architecture before code Hexagonal and domain-driven: the domain never imports infrastructure. Written down as a constitution.
- Red, green, refactor No merge without tests. Coverage gates in CI.
- Numbers before opinions Measure lead time before arguing about speed. Benchmark one hypothesis at a time.
- AI executes, I decide Spec-driven development with coding agents. Agents never write to a production database.
- Small steps you can undo Learned when one batch of driver installs bricked a Fedora setup.
- Built for whoever uses it Backend in English, interfaces in Spanish and English, mobile first.