Jeff Yang@yjf123ChinaFollow BadgesProblem SolvingCPPPython CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Python (Basic)VerifiedskillWork Experienceyjf123 has not updated employment details yet.Educationyjf123 has not updated education details yet.