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Oleg Tretiak has a diverse work experience that spans over a decade. Oleg started their career as a Manager of Sales at a company called PromSIZ, where they worked from November 2007 to September 2009. Oleg then took on the role of Department Head for Network Cooperation at the same company from September 2009 to April 2013. After this, they joined OTP Bank in Ukraine in September 2013 as the Head of Project Development and Support for Internet Projects. In January 2020, they were promoted to the position of Head of Digital Marketing at OTP Bank.

Oleg Tretiak attended the Nikopol University of Economics from 2011 to 2016, where they received a Specialist degree in Organization Management. In 2019 and 2020, they also attended WebPromoExperts where they pursued a field of study in Director of Internet Marketing.