Sotiris has gained extensive professional experience in various legal fields. As a Rechtsreferendar (legal trainee) at the Regional Court of Heidelberg, he was involved in diverse legal proceedings. Simultaneously, he worked as a trainee lawyer at the DG Competition of the European Commission, contributing to antitrust investigations in the financial sector. His experience at Herbert Smith Freehills LLP provided him with insights into European finance law, while his role as a research assistant at Hogan Lovells LLP in the International Capital Markets department deepened his understanding of financial regulation. Additionally, he worked as a research assistant at the Max-Planck-Institute in Heidelberg, focusing on comparative public law and international law. Earlier in his career, he completed a traineeship at the Hellenic-German Chamber of Commerce and worked as a research assistant at the German Cancer Research Center (DKFZ).