architecture

Design or refactor multi-service system architecture (domain boundaries, service decomposition, event-driven vs request/response, CQRS, sagas, API gateways, data ownership). Use when work spans multiple processes/services, needs eventual consistency, or requires clearer integration seams. NOT for in-process code structure like GoF patterns (use design); NOT for applying timeouts/retries/breakers to a single call (use resilience).