Sergey Koltsov@by3dringFollow BadgesProblem SolvingDays of Code CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillWork Experienceby3dring has not updated employment details yet.Educationby3dring has not updated education details yet.Linksby3dring has not updated links details yet. Skillsby3dring has not updated skills details yet.