Eugênio Barbosa de Melo Júnior, PhD, is a CNPq-funded postdoctoral researcher in Nursing at the Federal University of Piauí (UFPI), Brazil. He holds a PhD in Nursing (2023), a Master’s degree in Health Sciences (2018), and a specialization in Emergency Care (2017). His research interests include public health nursing, child and adolescent health, health education, and the development and validation of digital health technologies. His doctoral research, which focused on the development and validation of a mobile application to reduce vaccine hesitancy, was recognized with awards for Best Doctoral Thesis and Scientific Innovation. Dr. Melo Júnior has extensive experience as an emergency nurse and as a lecturer in both undergraduate and graduate programs. He also serves as a peer reviewer and editorial board member for several national and international journals. His scholarly work encompasses studies on vaccination, health literacy, and technology-based interventions in healthcare.