Sergey Demidov@sergentumsSenior Software Engineer at NexignRussian FederationFollow BadgesProblem SolvingSql CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Rest API (Intermediate)VerifiedskillWork Experiencesergentums has not updated employment details yet.Educationsergentums has not updated education details yet.