At the seventh European Workshop on Software Ecosystems, the research on software ecosystems and platforms proved to be advancing very well. Goal of this workshop is to: 1.bring together the software ecosystem and platform ecosystem research community from all over Europe and 2. share, present and discuss their latest research with business software industry experts. Researchers and Presenters: New Ecosystem Opportunities & 'White space' Opportunities in Software and High-Tech Data Economy, Platforms and Privacy Peter Buxmann (TU-Darmstadt) New Cloud-Based Ecosystem Opportunities for Digital Business Thomas Curran Uberization of field service Sebastien Dupre (SAP SE) Panel on Network Effects, Data Effects & AI - Keys to the castle John Rethans (Apigee/Google) Ecosystem Driven Development Slinger Jansen (University of Utrecht) Design patterns for business success for software platforms and ecosystems Ralf Meyer (Synomic)