How do REST API and GraphQL developers typically collaborate with frontend teams to optimize data fetching and performance?

REST API and GraphQL developers work closely with frontend teams to ensure that data delivery is efficient and meets the needs of user interfaces. For REST, this often involves designing endpoints that provide just the necessary data, while with GraphQL, developers create schemas and resolvers that enable clients to request specific fields, reducing over-fetching. Regular communication is key to understanding frontend requirements and iterating on the API structure to support new features or changes, leading to a more responsive and maintainable application.