We recognized the need to bring our domain-oriented micro-services together with GraphQL Federation to normalize the access path for UI developers. At the same time, the business goals were to create applications to capture structured data rather than having it trapped in spreadsheets. In this talk, you will hear the tale of how a domain service was created as a member of our federated graph. The talk will cover the full lifecycle of the service, from how the underlying model was collaborated upon before writing any code to how we approach testing to deliver the system with confidence. All the steps in between will be touched on, including collaborative GraphQL schema authoring and how we enabled UI developers to make progress while implementing the backend. You will learn about the collaboration features we created to entice users out of Google Sheets and into the system. The system’s architecture borrows ideas from Domain Driven Design, Event Sourcing, and CQRS. You will learn how these concepts align with GraphQL and work synergistically to allow the creation of real-time application UIs for your users while being extremely testable allowing you to deliver business value quickly and confidently.  –  How we approached the building of a new GraphQL service.  –  GraphQL is CQRS hiding in plain sight.  –  The value of using GraphQL schemas to collaborate with UI teams  –  How we used property-based testing to deliver changes with confidence [color=#111111][size=2][font=Verdana, Arial, Helvetica, sans-serif][h2][/font][/size][/color][b][color=#111111][size=2][font=Verdana, Arial, Helvetica, sans-serif][url=https://drive.google.com/file/d/1VtqVIgnni0wSzsmIuNmXftzASagp2ipw/view?usp=sharing]Slides[/url][/font][/size][/color][/b][color=#111111][size=2][font=Verdana, Arial, Helvetica, sans-serif][/h2][/font][/size][/color]