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Jacek Czerski is a Senior Android Developer with extensive experience in mobile app development, currently working at SumUp since July 2021, where responsibilities include developing the Online Store and Item Catalog, reducing technical debt, conducting code reviews, participating in recruitment, and managing releases. Previously, Jacek held a similar role at Droids On Roids from December 2019 to June 2021, overseeing client requirements, CI setup, and various successful applications. Jacek has also served as a Mobile Team Leader at Grupa DOMODI and held roles at Viessmann, Tooploox, and Nasza Klasa, accumulating a diverse skill set in Kotlin, Java, and various development technologies. Jacek holds a Bachelor of Science degree in Teleinformatics from Wrocław University of Science and Technology.