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Sergey Radzishevskyi is a Senior Software Engineer with extensive experience spanning over a decade in the software development industry. Currently at Contra since December 2021, Sergey focuses on enhancing payment system integrity within a freelancer marketplace. Prior roles include Senior Software Engineer positions at Stoplight, where Sergey developed enterprise-scale API tools, and Rezdy, where Sergey improved the frontend experience of a booking platform. Additional experience includes contributions at ManageFlitter to boost productivity tools for Twitter users, leadership roles at 2am.tech and SoftServe managing development teams, and foundational work at FirstbeatMedia and earlier positions as a PHP Developer. Sergey holds a Master's degree in Computer Systems and Networks from Sevastopol State Technical University.