DDD Module Boundaries & Decoupling Modular Monoliths
Answer-first: A Modular Monolith prevents code degradation (“Big Ball of Mud”) by applying Domain-Driven Design (DDD) Bounded Contexts, isolating database schema namespaces (e.g. billing.payments, inventory.stock), enforcing compile-time import boundaries via Go internal packages and arch-go, and using an in-memory transactional outbox pattern for asynchronous event communication. Implementing this architecture enforces sub-50ms P99 latency guarantees, strict component isolation, and automated observability pipelines. Prerequisite: Before reading this part, please review Part 2: FinOps Cost Reality. ...