Ask most developers to build "a restaurant app" and you get a menu and an order button. Ask what it takes to actually run a restaurant, and you discover it's nine businesses wearing a trench coat. Modeling that honestly is the real work behind DineGuru.
The domain is bigger than the UI
A restaurant's software surface looks simple and hides enormous operational depth. Behind the storefront sits identity and access (who can do what), a menu catalog, ingredient stock, orders and billing, recipe costing, procurement, and analytics — each a genuine domain with its own rules, data, and workflows.
Get the model wrong and everything downstream fights you. Cram it all into one undifferentiated blob and you can't reason about any part in isolation. The hard, unglamorous engineering is drawing the boundaries right.
Designing nine domains
DineGuru is organized as a FastAPI modular monolith over PostgreSQL with nine bounded domain modules. The discipline is that each module owns a coherent slice of the business:
- Recipe costing knows nothing about identity; identity knows nothing about procurement. Each domain has one job and a clear boundary.
- Data models follow the domain, not the screen. The schema reflects how a restaurant actually operates — stock depletes as orders bill, costs roll up from recipes — rather than whatever a particular page happened to need.
- Multi-tenancy runs underneath all of it, scoped server-side, so every domain enforces isolation by default rather than each one reinventing it.
Why domain modeling is the underrated skill
Frameworks and languages come and go; the ability to look at a messy real-world business and carve it into clean, bounded domains is the skill that actually determines whether a system stays maintainable. Good boundaries make change local — you can evolve procurement without touching billing. Bad boundaries make every change a landmine.
DineGuru taught me that the most valuable time on a real product is often spent before the code: understanding the domain deeply enough to model it honestly. Nine modules isn't complexity for its own sake — it's the actual shape of the problem, respected.
The full architecture is on the project page.
👉 See the platform: www.divyakush.com/projects/dineguru
Divyakush Punjabi — Full-Stack & AI Systems Engineer
🌐 https://www.divyakush.com · 💼 LinkedIn · 💻 GitHub
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