The text discusses the refactoring of monolithic APIs to microservices using the Backend for Frontend (BFF) and Strangler patterns. The BFF pattern involves creating separate backend services for different frontend clients, encapsulating client-specific logic, and optimizing data aggregation, performance, and security. This allows for independent development and scaling of each service. The Strangler pattern is used to migrate monolithic APIs to microservices incrementally, without a full rewrite. It involves throwing an intermediary interface/proxy in front of the old monolith, routing all its functionality to new microservices as they are implemented, and gradually decommissioning the older architecture. The BFF layer acts as a proxy for the Strangler, shielding the frontend from changes to downstream services or data dependencies. WunderGraph is a BFF framework used to consolidate data dependencies into an unified API that can be queried and mutated using GraphQL or TypeScript operations. By combining the BFF and Strangler patterns, developers can migrate monolithic APIs to microservices architecture while minimizing risks and maximizing flexibility.