Clean Architecture & Hexagonal in Go interview questions

Clean architecture in Go is a first-class interview topic at companies with large Go codebases — particularly when the interviewer asks 'how would you structure a Go microservice from scratch?'. This module covers the canonical four-layer Go service structure (handler → service → repository → model), hexagonal architecture (ports and adapters in Go — how to define a port as a Go interface, an adapter as a concrete struct implementing that interface, and how to swap implementations without touching business logic), dependency wiring with Google Wire and Uber fx (the build-tag-based approach vs the inject-at-runtime approach), event-driven architecture in Go (domain events as channel messages or Kafka events, the trade-off with synchronous service calls), and CQRS — command and query handlers as separate interfaces in Go. Every answer addresses the question interviewers ask before the pattern: 'how much architecture is the right amount for this codebase?'