SA Teaches: The Five Layers of a Well-Architected Tech System
Every well-architected system has five distinct layers: data, business logic, integration, API, and presentation. What each does, why the boundaries matter, the cost of conflating them, and their direct mapping to Bubble.io components.
How SA Structures Every Tech System
Every well-architected software system is a set of distinct layers, each with a clear responsibility and a clear interface. When these layers are correctly separated, the system is maintainable, extensible, and secure. When they are conflated or incorrectly implemented, the system becomes brittle, slow, and vulnerable. SA teaches this layered model as the foundation of all tech system design.
What Each Layer Does and Why It Exists
The Cost of Conflating Layers
Security in the Wrong Layer
Enforcing access control only in the presentation layer means a determined user can access data directly via the API. Security must be enforced at the data layer (privacy rules) and business logic layer (workflow conditions). Presentation layer visibility is UX, not security.
Business Logic in the Data Layer
Putting complex conditional logic into database queries (via :filtered by) makes queries expensive and brittle. Business logic belongs in workflows, where it can be read, maintained, and updated without restructuring the database.
Integration Logic in the Presentation Layer
Calling external APIs from frontend workflows with API keys not marked private exposes secrets via the browser network tab. Integration logic belongs in the integration layer, executed server-side, always.
The Practical Translation
| Architecture Layer | Bubble Implementation | Key Rule |
|---|---|---|
| Data Layer | Data types, fields, privacy rules | Privacy rules on every data type; workspace field on all app types |
| Business Logic Layer | Backend API workflows, workflow conditions | Role checks on Step 1 of every sensitive workflow |
| Integration Layer | API Connector (all keys marked Private) | All external API calls server-side; never from frontend with exposed keys |
| API Layer | Data API, Workflow API | API token authentication; privacy rules enforce data scope automatically |
| Presentation Layer | Pages, elements, UI conditions | Conditional visibility for UX; never as the sole security mechanism |
Draw the Layers Before You Open the Editor
Before opening Bubble for any new project, SA draws the five-layer diagram for that application. Which data types go in the data layer? Which workflows in the business logic layer? Which external services in the integration layer? This 20-minute drawing produces a shared understanding of the system structure before a single element is placed.
Work With SA — Simple Automation Solutions
Pakistan’s leading no-code systems architecture practice. We design tech systems before we build them.
