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Sergio Martínez Crespo has worked in various roles in the field of UX and product design since 2016. Sergio began as a UI/Graphic Designer Freelance in 2016 and then moved to Introworks as a Graphic and Editorial Designer. In 2017, they worked as a UI Designer at Somos3Ways, where they designed applications for medical and pharmaceutical companies and web portals for online conferences. In 2018, they joined Amaris as a Product Designer for Openbank and X by Orange, where they created the portal from scratch and served as a "product ambassador" for the UX team. From 2020 to 2021, they worked at CAS Training as a Product Designer for BBVA Next Technologies and Ferrovial. Sergio is currently employed as a UX Designer Lead at OMD HR Consulting.

Sergio Martínez Crespo completed a Máster in Usability and User Experience at the Universitat Abat Oliba CEU from 2017 to 2018, in the field of Design and Visual Communication. In 2019, they completed a course in Product Design at Torres Burriel. Sergio also completed a course in Mobile App Design in 2017, a course in Usability and User Experience in 2016, and an Introduction to Responsive Web Development in 2016. From 2014 to 2016, they completed an FP Superior in Design and Editorial Production at Ies Virgen de la Paloma, in the field of Graphic Design. Additionally, they completed courses in Information Architecture and Research in UX at Crehana in 2020.