architecture

To enforce module boundaries and scalable project layouts, define explicit surface APIs, establish a predictable three-layer folder structure, and document ownership rules to guide both new initiatives and refactors.

The best way to structure folders for feature-based modularity is adopting a three-layer layout with 01-presentation, 02-logic, and 03-data directories, ensuring predictable dependency direction across modules.

Guide an architecture audit or refactor by codifying architecture principles to evaluate explicit boundaries, ownership, and dependency flow, which minimizes cross-cutting changes during structural restructuring.

Yes, you can use these software design principles for onboarding new engineers. The explicit module boundaries and predictable folder architecture provide clear guidance on project structure and code ownership.

You should not use a strict three-layer folder architecture when your software project lacks designable structures or when the codebase does not require explicit surface APIs and strict dependency direction rules.