Yifan Xu@yifanx2Follow BadgesProblem Solving CertificationsCertificate: Problem Solving (Basic)VerifiedskillWork Experienceyifanx2 has not updated employment details yet.Educationyifanx2 has not updated education details yet.Linksyifanx2 has not updated links details yet. Skillsyifanx2 has not updated skills details yet.