Worked on the grafbase/grafbase repository to deliver a feature that streamlines dynamic GraphQL entity resolvers within federated mocks. Refactored the DynamicSchemaBuilder in Rust to directly accept entity resolvers, updating the _entities resolution process to iterate through provided resolvers. This approach reduced boilerplate code and simplified the mocking of federated entities, making the codebase more maintainable and accessible for contributors. Leveraged skills in API mocking, federation, and GraphQL, with a focus on JSON and Rust. The work enhanced the mocking capabilities for federated graphs, enabling faster iteration, safer tests, and improved onboarding for developers working with federated schemas.