Olaf Zimmerman is a professor and institute partner at the Institute for Software at the University of Applied Sciences of Eastern Switzerland, Rapperswil (OST) in Rapperswil, Switzerland. His areas of interest include API design and management, domain-driven design and (micro-)services on solution, portfolio and enterprise level. As an industrial researcher and software architect at ABB and IBM, he provided design, implementation and integration services to clients in multiple industries before. He also developed and taught middleware and tools for systems and network management. Olaf is a certified The Open Group Distinguished (Chief/Lead) IT Architect and a member of Hillside Europe and the Agile Alliance. He is an author of “Perspectives on Web Services” (Springer, 2003) and the first IBM Redbook on Eclipse and Web services (2001). He was awarded the first IEEE Software Best Presentation New Directions Award at SEI SATURN 2010. He currently leads the Microservice API Patterns (MAP) and Microservice Domain Specific Language (MDSL) projects and created the Design Practice Repository (DPR). He also is a co-editor of the Insights column in IEEE Software.