Designing a Budget Control Service with Domain‑Driven Design
This article walks through the complete process of designing a budget‑control platform using Domain‑Driven Design, covering background analysis, strategic and tactical design, domain modeling, service decomposition, interface definition, and technical implementation to illustrate how to build a cohesive, scalable backend service.
Background – The article uses a budget‑control service as a concrete DDD example, simplifying requirements to focus on the design workflow rather than detailed correctness. It highlights that complex, long‑running business processes with many stakeholders are suitable for DDD.
Strategic Design – It outlines business analysis, goal definition, and the production of a unified accounting capability. Core functional requirements include accounting, settlement, multi‑dimensional queries, inventory creation, deduction, and scaling, along with strict data isolation, synchronous/asynchronous accounting, custom accounting periods, and performance guarantees.
Tactical Design – The article details domain modeling (identifying aggregates, entities, and value objects), business service identification (splitting by bounded contexts or subdomains), and interface definition. Visualizations such as event‑storming, domain terminology, commands, and events are presented to clarify the domain language and bounded contexts.
Technical Implementation – After strategic and tactical design, the article discusses concrete technical choices: architecture style (monolith, SOA, micro‑services), architectural patterns (layered, hexagonal, onion), component selection (RPC, gateway, ACL), framework and stack decisions, API design (OpenAPI/Swagger), persistence strategy (RDBMS vs NoSQL), and non‑functional concerns like testing, performance, maintainability, and security.
Conclusion – It warns against premature technical detail before finalizing the domain model and encourages continuous refinement of the ubiquitous language and bounded contexts to keep the design aligned with business value.
Top Architect
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