IOANNIS STEFANOS KARYSTINOS@john_stef_karyFull stack developerGreeceFollow BadgesProblem SolvingJavaPythonDays of CodeDays of JS CertificationsCertificate: Problem Solving (Basic)VerifiedskillWork Experiencejohn_stef_kary has not updated employment details yet.Educationjohn_stef_kary has not updated education details yet.