https://gueden.com/blog Personal site of Alejandro Guerra. Fullstack developer and solution architect based in Madrid, building Zendinit, Yappie and other side projects. es-ES ale.gueden@gmail.com (Alejandro Guerra) ale.gueden@gmail.com (Alejandro Guerra) Sun, 03 May 2026 00:00:00 GMT https://gueden.com/blog/en/building-yappie https://gueden.com/blog/en/building-yappie A dev with 10 years of experience builds his first open source product. TDD, AI as copilot, and everything that went wrong along the way. Sun, 03 May 2026 00:00:00 GMT ale.gueden@gmail.com (Alejandro Guerra) yappieside-projecttddai https://gueden.com/blog/es/building-yappie https://gueden.com/blog/es/building-yappie Un dev con 10 años de experiencia construye su primer producto open source. TDD, IA como copiloto, y todo lo que salió mal en el camino. Sun, 03 May 2026 00:00:00 GMT ale.gueden@gmail.com (Alejandro Guerra) yappieside-projecttddai