How does Rails handle large-scale API composition using backend-for-frontend (BFF) patterns?

Rails implements BFF layers to aggregate multiple backend services into optimized API responses for clients.

BFF architecture centralizes API aggregation logic in a dedicated layer, often implemented in Rails. It collects data from multiple microservices and returns a single optimized payload. This reduces frontend complexity but introduces backend latency challenges. Parallel requests, caching, and partial failure handling are essential at scale.