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Juan Sierra began their career in 2014 as a Camarero at Katamaran. In 2017, they worked as an Azafato de Eventos at Elite RGB. In 2018, they worked as a Software Developer at Aire Networks, where they were responsible for the maintenance and development of the company's ERP, communications and development with WebApis, and used PHP 5, HTML, and Javascript. In 2019, they worked as a Software Developer at PCCOM, where they were responsible for a restyling project of ERP at the food sector, an expedient management project for UTE, and a warehouse management project. In 2022, they began working as a Software Engineer at GitKraken.

Juan Sierra completed a degree in Ingeniería informática from Universitat d'Alacant between 2016 and 2019.