Steve Gill, Slack’s Director of DevRel Engineering, digs in to the craft of building great APIs for developers. We discuss the power of open source for informing platform work, building platforms that developers will actually use, the tricky issues around building and supporting SDKs, the concept of “raccooning” at Slack, how Slack’s new composable apps enable a whole new category of app, and the importance of saying “no” when a new feature isn’t working out.