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Spiros Tzavellas has extensive experience in software engineering, currently serving as Principal Software Engineer at Pollfish since April 2016, after ascending from the role of Senior Software Engineer. Previous positions include Senior Software Engineer at IMC SA, Dopios, Hellas Direct, and Chrysi Eykairia Group. Spiros also contributed as a Software Developer at Ideal Systems S.A. and European Dynamics. As a founding member of the Java Hellenic User Group, Spiros has been actively involved in presenting at monthly meetings since 2003.