Sergei Kornilov@KosernikprogrammerRussian FederationFollow BadgesProblem SolvingJavaDays of CodeDays ofStatistics CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Java (Basic)VerifiedskillWork ExperienceKosernik has not updated employment details yet.EducationKosernik has not updated education details yet.