Simplebank is a financial services backend application built with Go that manages bank accounts and transfers. It utilizes a dual-protocol interface, providing both gRPC and REST APIs via Protocol Buffers to support different client communication requirements.
The system implements a PostgreSQL data layer with versioned schema migrations and type-safe query generation. It handles financial operations through atomic fund transfers and balance change tracking to maintain consistent audit trails.
The architecture includes an asynchronous task worker system using a message queue to offload long-running processes and middleware for token-based user authentication and role-based request authorization. The project also employs interface-based mock injection for unit testing and is packaged for deployment on Kubernetes clusters using containerization.