Сергей Бойцов@echonovemberFollow BadgesProblem SolvingSql CertificationsCertificate: Problem Solving (Basic)VerifiedskillWork Experienceechonovember has not updated employment details yet.Educationechonovember has not updated education details yet.LinksGithubhttps://github.com/echonovember Skillsechonovember has not updated skills details yet.