During August 2025, Juan de Blas extended the Z boson electroweak observable suite in the silvest/HEPfit repository by developing new C++ classes to compute partial decay widths for multiple Z decay channels. He applied object-oriented design principles to create modular observable classes and registered them within the existing factory framework, streamlining their integration into electroweak analyses. This work enhanced the precision and flexibility of Standard Model tests and facilitated the onboarding of additional decay channels. Juan’s contributions demonstrated strong skills in C++ development, physics analysis, and disciplined version control, laying a solid foundation for future electroweak precision studies.