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Arnoldo Trejos has a diverse work history spanning multiple industries. Arnoldo began their career as a Creative Designer at Sepacolor in 2004 before transitioning to a Collection Representative at Van Ru Credit Corporation in 2005. In 2006, they joined Stadt von Sonne as a Web Developer and SEO specialist, responsible for the Graphics and Marketing Department and various online companies. From 2007 to 2008, they served as the IT Manager and Webmaster at Costa Rica Call Center Integrated Solutions, overseeing website and web application development, email and hosting administration, and database maintenance. In 2008, they joined Vialuna Technology as a Webmaster, handling website development, integration of web applications, and web maintenance. At Betcris, they worked as a Front-End Web Developer from 2009 to 2011. From 2011 to 2013, they held multiple roles at avVenta Worldwide, including Senior Web Developer for Business Acquisition Services and Web Developer/CMS Specialist for Citibank. In 2013, they joined Alinean, Inc. as a Consultant for Web Development. Arnoldo then worked at Viral M3dia from 2014 to 2015 as a Full-Stack Designer and Front-end Developer before joining Horsefly in 2015 in the same role.

Arnoldo Trejos obtained their high school diploma from Instituto Antoine de Saint Exupery in the years 2000 to 2001. Arnoldo then went on to pursue a Bachelor's degree in Graphic Design/Advertising from Universidad Americana (CR) from 2004 to 2008. During the same period in 2004, they also obtained a technical degree in Web Design from Instituto Latinoamericano de Computación (ILAC). Subsequently, Arnoldo pursued a Licentiate degree in Graphic Design/Advertising from the same university, Universidad Americana (CR), from 2009 to 2013.

Additionally, Arnoldo Trejos has obtained several certifications throughout their career. In 2018, they earned the Scrum Master Professional Certificate (SMPC) from CertiProf® and the Ciberseguridad para PYMES y Autónomos certificate from INCIBE - Instituto Nacional de Ciberseguridad. In 2019, they obtained the Advanced Google Analytics certification and the Google Analytics Individual Qualification from Google.