wenkai zheng@derrick_zhengUnited StatesFollow BadgesProblem SolvingJavaDays of CodeC language CertificationsCertificate: C (Basic)VerifiedskillCertificate: C (Intermediate)VerifiedskillCertificate: C (Advanced)VerifiedskillWork Experiencederrick_zheng has not updated employment details yet.Educationderrick_zheng has not updated education details yet.