Josef Lieven and his software engineering team are set to release Germany's first online vaccination passport, with the ambitious goal of enabling Europeans to travel this summer. T-Systems and software developer SAP, the two companies that created Germany's contact-tracing app, have been assigned by the European Commission to create a digital certificate. The certificate will verify whether a person has been fully vaccinated against COVID-19, provided a negative test result, or possesses antibodies. The data is saved in a QR code which is authenticated by the EU, as well as its neighbours, Iceland, Norway, and Liechtenstein.