Иван Рязанов@ryazanov_kalugaRussian FederationFollow BadgesProblem SolvingJavaSql CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Problem Solving (Advanced)VerifiedskillWork Experienceryazanov_kaluga has not updated employment details yet.Educationryazanov_kaluga has not updated education details yet.