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Juan José Martínez Calderón is the Chief Technology Officer at ZeMobile since January 2019. Prior to that, Juan José worked as an Ingeniero de software at Wallo from January 2017 to January 2019. Juan José also held similar positions at Publicidad.net, Gelbe Seiten Online, and Recomendar. Before their software engineering roles, Juan José worked as a Desarrollador web at Servicios de Consultoría Independiente. In terms of education, Juan José studied Desarrollo de aplicaciones informáticas at I.E.S. Villa de Agüimes and Ingeniería Informática de sistemas at Universidad de Las Palmas de Gran Canaria. Juan José was also a Técnico de televisión y radio at Radio Televisión Tagoror.