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Oleh Tkachenko is an experienced marketing professional currently serving as a Product Marketing Manager at both Kyivstar.Tech and KOLO since December 2022, and in a Marketing Product Management role at Київстар since January 2022. Previously, Oleh held the position of CMO at coffeeok from February 2015 to January 2022, where significant achievements included mentoring a newly formed team and developing a marketing strategy that resulted in a 25-fold revenue increase over seven years. Prior roles include Marketing Manager at интернет-магазин Repka.ua, where brand awareness doubled through effective advertising, and Analyst Marketer at YUGCONTRACT, contributing to enhanced decision-making through data analysis. Oleh holds a Specialist degree in International Economics from Академия Таможенной Службы Украины, attained between 2007 and 2012.