How to Master Business Architecture with Layered and Domain‑Driven Design

What Is Business Architecture?

As business scenarios become increasingly complex, implementation solutions also grow in complexity, making understanding, maintenance, and iteration more difficult. The core purpose of business architecture is to control system complexity by providing standards and constraints, guiding developers to decompose problems, design structurally and abstractly, and ensure maintainability and readability.

Layered Architecture

Traditional three‑layer architecture consists of presentation, business logic, and data access layers, communicating via interfaces and models. This simple structure suits small monolithic applications. For more complex, stable, and scalable needs, microservice layered architecture splits the business logic layer into a business gateway layer (handling business scenarios) and a business service layer (handling core logic), enabling isolation and reuse.

However, microservice layering faces challenges: inconsistent understanding of the boundary between gateway and service layers leads to either “skinny” services lacking reusable logic or “fat” services with poor reusability. Additionally, developers often lack deep understanding of business scenarios, resulting in duplicated tables, fields, and code, which hampers long‑term maintenance.

Domain‑Driven Design (DDD)

DDD is a methodology for tackling system complexity. It introduces strategic concepts such as domains, sub‑domains, and bounded contexts to split a large system into smaller subsystems, and tactical concepts like entities, value objects, aggregates, factories, infrastructure, domain services, and events to guide implementation.

DDD is an abstract thinking model, not a concrete architecture. Implementing it requires developers to deeply consider domain knowledge, identify boundaries at each layer, follow naming conventions, and apply the principle of least knowledge between layers. Proper domain modeling improves design consistency, readability, reusability, and extensibility.

When applying DDD, it is essential to separate domain logic from workflow control. Core business functions reside in the domain layer, while the application layer orchestrates domain components to fulfill specific scenarios and handles non‑domain details. In our practice, most scenarios are composed of domain capabilities, with occasional use of finite state machines, lightweight rule engines, or pipeline patterns.

Choosing the Right Architecture for Your Business

We integrated a lightweight domain‑centric design into our existing microservice architecture. Core business logic is encapsulated in domain objects (using anemic models) and domain services, with read/write separation: write services depend on domain capabilities for state changes, while read services directly use the infrastructure layer. This structure maintains flexibility across layers, ensures high cohesion of core logic, and reduces the expertise required from developers.

Conclusion

There is no one‑size‑fits‑all solution for business architecture; it must align with the specific business form and development stage. The architecture that best fits your own business is the optimal one.