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Separating core business logic from platform adapters in a scalable architecture requires standardizing a five-layer taxonomy spanning Primitives, Services, State & Signals, UI, and Features, enforcing explicit entrypoints to keep core rules decoupled from platform-specific implementations.

Structuring a portable application for web, mobile, API, and CLI surfaces involves defining a central Core with thin Adapters and shared cross-cutting capabilities, allowing teams to iterate on interfaces without modifying underlying business rules.

The Core-Adapter separation pattern reduces architectural drift by centralizing cross-cutting concerns like observability and security into shared capabilities, preventing platform-specific code from leaking into the core business logic across multiple surfaces.

You can apply this architectural pattern across modern applications spanning web, mobile, API, and CLI platforms, using explicit adapter entrypoints to serve multiple surfaces while maintaining a single, portable core implementation.

You need to enforce a five-layer taxonomy for software architecture when designing scalable systems where multiple teams iterate on UI and Adapters independently, requiring strict boundaries between Primitives, Services, State, and Features to prevent structural drift.

Standardizing core logic and adapters reduces maintenance overhead by establishing a portable, decoupled architecture that keeps business rules separate from platform-specific adapters, minimizing duplicate code and drift across surfaces.