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Mario Castro Oliva has extensive experience in financial and administrative roles, currently serving as an Assistant in the Financial and Countable Department at GVO Optics since July 2016, where responsibilities include managing CRM systems and overseeing sales orders for both national and international clients. Previously, Mario worked as a Junior Accounts Executive at AR Difusión, S.A. from December 2012 to November 2015, focusing on customer acquisition and proposal development. Additional experience includes roles in sales for Verisure alarms and administrative assistance at EULEN Group, as well as a real estate internship at FCI, SL. Mario holds a Bachelor of Business Administration from Universidad Rey Juan Carlos, completed in 2012, with a focus on French.