I got my Bachelor in Physics in 2025 at the USC, and my Master in Nuclear and Particle Physics at the same university one year later. Now, I am starting a PhD at the IGFAE, working on the reconstruction of Horizontal Air Showers (HAS) using the Surface Detector of the Pierre Auger Observatory. This project aims to improve the reconstruction of these highly inclined showers and contribute to a better understanding of their properties and the physics underlying their development.