Sergey Mazur@xmsergeyTeam LeadFollow 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.Linksxmsergey has not updated links details yet. Skillsxmsergey has not updated skills details yet.