Do Phong@itmtslumtslVietnamFollow BadgesProblem SolvingCPPPythonDays of CodeRuby CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: C++ (Basic)VerifiedskillWork Experienceitmtslumtsl has not updated employment details yet.Educationitmtslumtsl has not updated education details yet.