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Guillermo Almagro Alonso is a cybersecurity professional with extensive experience in cyber threat hunting and security operations. Currently serving at S21sec since June 2018, Guillermo has held various roles including Cyber Threat Hunter, Cyber Security Analyst, and SOC Cybersecurity Operator, engaging in activities such as security auditing with tools like Kali Linux and Nessus. Prior to this role, Guillermo worked as an intern in development and research at the Instituto Nacional de Tecnica Aeroespacial (INTA) for a brief period in early 2018. Guillermo holds a Master’s degree in Cybersecurity from Universidad Internacional de La Rioja (UNIR) and a Bachelor's degree in Computer Engineering from Universidad de Alcalá.