Marvin Döring is a consultant at econtea GmbH. He specialises in electronic invoicing (e-invoicing), electronic invoice validation and API integration. In 2016, after graduating in applied computer science in Stuttgart, he initially worked as a software engineer for toll collection. Always interested in creating and developing open source software, he has successfully turned one of his hobbies into his career. He also enjoys travelling, loves tenpin bowling and lets off steam on the badminton court.