How to Design APIs Like a Senior Engineer (REST, GraphQL, Auth, Security)

A comprehensive guide covering advanced API design principles that distinguish senior engineers from junior developers. Explores REST, GraphQL, and gRPC architectures, application protocols (HTTP, WebSockets, AMQP), transport layer protocols (TCP/UDP), and authentication methods including OAuth2 and JWT tokens. Covers practical aspects like resource modeling, status codes, error handling, filtering, pagination, and security best practices for building scalable, maintainable APIs.