Custom integration flow step for integration service

According to some embodiments, methods and systems may be associated with a cloud computing environment having an integration service (e.g., associated with a Software-as-a-Service or a Platform-as-a-Service). A design micro service may have a User Interface ("UI") framework and UI components in a domain specific language for an integration developer. A custom flow step development kit may receive, from the integration developer via a browser-based graphical UI, information to build logic for a custom flow step associated with a microservice-based integration service. In some embodiments, a new integration component is embedded into an existing set of components for a tenant, and the new custom flow step is deployed in, and re-usable by, other integration services (e.g., via a marketplace).