Anton Maidel@anton_maidelRussian FederationFollow BadgesProblem SolvingSqlRuby CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Problem Solving (Advanced)VerifiedskillWork Experienceanton_maidel has not updated employment details yet.Educationanton_maidel has not updated education details yet.