Hai Tran@hai_redfoxRuby on Rails DeveloperViet NamFollow BadgesProblem SolvingCPPDays of CodeDays of JSSqlRuby CertificationsCertificate: Ruby (Basic)VerifiedskillCertificate: Ruby (Intermediate)VerifiedskillWork Experiencehai_redfox has not updated employment details yet.Educationhai_redfox has not updated education details yet.