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Lefteris Katiforis is an experienced software engineer with a strong background in backend development and system design. Currently serving as a Senior Software Engineer at Upstream since September 2020, Lefteris has been involved in the development of the core backend system for Upstream's Marketing platform, contributing to system performance optimization and mentoring junior developers. Previously, as a Java Software Engineer at Upstream, Lefteris developed a Profiling Platform to manage user data efficiently. Prior roles included working as a Java Software Engineer at Intralot on an API Gateway Orchestrator and as a Junior Software Engineer at Cognity and BK Telematics, where Lefteris focused on both backend and frontend development. Lefteris holds a Bachelor's degree in Informatics from Technologiko Ekpaideutiko Idrima, Athinas.