ms-architecture-patterns

To structure scalable backend architecture, apply Clean, Hexagonal, and Domain-Driven Design patterns by separating core domain logic from external interfaces. This approach provides production-ready templates to isolate business rules, enforce constitutional constraints, and maintain system quality across complex codebases.

The best way to document architectural decisions is using Architectural Decision Records (ADR templates). ADRs capture the context, decision, and consequences of architectural choices, providing standardized reference materials that ensure traceability and align microservices with event-driven design requirements.

You should use Saga, CQRS, and Event Sourcing patterns when migrating to event-driven designs or building scalable service architectures. These microservices patterns handle complex distributed transactions, separate read and write workloads, and persist state changes as a sequence of events for robust system recovery.

Yes, you can use these architecture patterns to refactor monoliths into maintainable backends. The guidance includes anti-pattern avoidance, complexity limits, and TAG-based traceability to help teams standardize architecture, safely decompose monolithic structures, and migrate toward modular domain boundaries.

Domain-Driven Design aligns backend code with microservices by modeling bounded contexts that map directly to autonomous service boundaries. This pattern enforcement ensures constitutional size constraints are met, preventing service coupling and maintaining scalable, maintainable event-driven architectures.