A Desarrollo Guiado por Pruebas (Test-Driven Development, TDD) developer follows a software development process where they first write an automated test case that defines a desired improvement or new function, then produces minimal code to pass that test, and finally refactors the new code to acceptable standards. The developer repeats this process in a short, rapid cycle. The primary aim is to make the code clearer, simpler, and bug-free. This methodology requires careful design and planning, thus improving software quality and responsiveness to changing customer requirements.