I started in QA writing test cases. Somewhere along the way I got more interested in the systems underneath the tests — the architecture, the tooling, the conventions that make a whole team faster. Now I build those systems. Based in Lima, Peru, with 5+ years working across the full quality stack: functional, accessibility (WCAG 2.0 AA), security (OWASP ZAP), i18n, and visual regression. This blog covers the domains most QA engineers don't write about publicly. Writing in Spanish first, English to follow.