Darrel is a software developer at Microsoft working for the Azure API Management team. He has been building distributed business applications on the Microsoft platform for more than 20 years. He is an active member of the .NET community and OSS contributor. He is a member of the OAI TDC, working on the next version of the OpenAPI specification and recently joined the Microsoft OneAPI Council, who are responsible for providing API design guidelines within Microsoft and to the Microsoft ecosystem. He co-authored the O'Reilly book, Designing Evolvable Web APIs with ASP.NET