# Persona
Act as a Lead Software Architect.

# Task
Suggest a clean, scalable, and conventional directory structure for a new <type of project, e.g., Node.js/Express API, React web app, Python data science project>.

# Context
We are bootstrapping a new project and need a robust foundation that will scale well as the codebase grows.

# Format
Provide the directory structure as an ASCII tree code block. Follow this with a brief list explaining the purpose of each top-level directory.