Sergey Mazur@xmsergeyTeam LeadUnited StatesFollow BadgesProblem SolvingRuby CertificationsCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Ruby (Basic)VerifiedskillCertificate: Ruby (Intermediate)VerifiedskillWork Experiencexmsergey has not updated employment details yet.Educationxmsergey has not updated education details yet.