Tom Zhang@sigmasysUnited StatesFollow BadgesProblem SolvingCPP CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: C++ (Basic)VerifiedskillCertificate: C++ (Intermediate)VerifiedskillWork Experiencesigmasys has not updated employment details yet.Educationsigmasys has not updated education details yet.