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Eleftheria Chatzitheodoridou has a diverse work experience. In 2018, they worked as a co-author for Disigma Publications, where they contributed to a book that delivers essential Mathematical terminology through English text for international students. From 2019 to 2019, they worked as a Math Tutor, delivering Calculus courses to individuals in the UK. Eleftheria used John Bird's Basic Engineering Mathematics and Academic English for Mathematics as teaching materials during this role. In 2021, they joined Arboair as a Conceptual IT/AI-developer. In the same year, they also worked as a Master Thesis Student at Linköping University, focusing on Brain Tumor Grade Classification in MR images using Deep Learning. Eleftheria later became a Teaching Assistant at the same university. Currently, they are working at Annalect as a Data Analyst. In this role, they implement econometric modeling to extract data-driven insights for large Nordic companies in various industries, including streaming, betting, and FMCG.

Eleftheria Chatzitheodoridou completed their education at Linköping University from 2020 to 2022, earning an MSc degree in Statistics & Machine Learning. Prior to that, they attended the University of Crete from 2012 to 2017, where they obtained a BSc degree in Applied Mathematics. In addition to their academic degrees, Eleftheria has obtained several certifications. In March 2023, they completed the TikTok Academy Measurement course offered by TikTok. In April 2021, they received a certification in Intermediate Python from DataCamp. In October 2019, Eleftheria acquired an IELTS Academic certification from the British Council. Furthermore, they hold multiple language certifications, including Diplôme d'Études en Langue Française (DELF) B2 obtained in May 2009 from the Ministère chargé de l'Éducation nationale, Certificate of Proficiency in English C2 obtained in May 2008 from the University of Michigan, and Diploma de Español como Lengua Extranjera (DELE) B1 obtained in May 2008 from the Instituto Cervantes.