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Dooho Chang is currently the CTO and Head of Engineering at PortOne Korea since May 2021. Prior to this role, Dooho was the Vice President of Engineering at Riiid from November 2019 to May 2021. Before Riiid, Dooho served as the Backend Lead at Devsisters from February 2018 to October 2019, and as the iOS Team Lead at 뱅크샐러드(레이니스트) from December 2016 to January 2018. With a background in Computer Science from Korea University, Dooho has been involved in designing and developing various applications and leading technical teams throughout their career.