The article delves into the use of gRPC with Golang, focusing on building an activity tracker by transitioning from a JSON-based REST service to gRPC. It highlights the benefits of gRPC, such as faster serialization and better type support through protocol buffers (protobufs), and demonstrates the process of setting up a gRPC server and client, including testing and generating code using the protoc tool. The author addresses the challenges of handling gRPC errors, emphasizing the importance of using proper status codes to avoid coupling client and server error messages. The article also explores testing gRPC servers using tools like grpcurl and recommends using Earthly to ensure consistent builds and version control of protoc, especially in larger teams. Overall, the author finds the transition to gRPC worthwhile for its efficiency and scalability benefits, despite the initial setup complexities.