Marco Hetzel@daveOpFollow BadgesProblem SolvingJavaDays of CodeSql CertificationsdaveOp has not earned any certificates yet. Work ExperiencedaveOp has not updated employment details yet.EducationdaveOp has not updated education details yet.LinksPortfoliohttps://www.xing.com/profile/Marco_Hetzel SkillsdaveOp has not updated skills details yet.