Yuan Cheng@chengy12Firefox Contributor at MozillaUnited StatesFollow BadgesProblem SolvingCPPDays of CodeDays of JS CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Problem Solving (Advanced)VerifiedskillCertificate: C++ (Basic)VerifiedskillWork Experiencechengy12 has not updated employment details yet.Educationchengy12 has not updated education details yet.