# Architecture & Design Patterns (React / Next.js)

> Feature-based structure, atomic design, clean architecture, SOLID principles, dependency injection

- 22 interview questions
- Senior
- [Interview Questions: React / Next.js](https://sharpskill.dev/en/technologies/react-next/interview-questions.md)

## 1. What is Atomic Design in React?

**Answer**

Atomic Design organizes React components into 5 hierarchical levels: atoms (buttons, inputs), molecules (simple forms), organisms (header, footer), templates (page layout), and pages (concrete instances). This methodology provides a consistent and scalable structure for the design system. It facilitates component reusability and collaboration between designers and developers by sharing a common vocabulary.

## 2. What is the main characteristic of a feature-based architecture?

**Answer**

Feature-based architecture groups all files related to a functionality in the same folder (components, hooks, styles, tests, types). This approach promotes co-location and feature autonomy. Each feature becomes an independent module with its own responsibilities, which facilitates maintenance and allows teams to work in parallel without conflicts.

## 3. What is the fundamental principle of Clean Architecture?

**Answer**

Clean Architecture is based on the Dependency Rule: dependencies must always point inward, from outer layers (UI, infrastructure) to inner layers (domain, business logic). The business domain should never depend on UI or frameworks. This separation allows testing business logic independently, changing frameworks without rewriting business code, and maintaining a decoupled and scalable architecture.

## 19 more questions available

- What does the SOLID 'Single Responsibility' principle mean when applied to a React component?
- What is dependency injection in React?

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## Other React / Next.js interview topics

- [JavaScript Essentials](https://sharpskill.dev/en/technologies/react-next/interview-questions/javascript-essentials.md): 25 questions, Junior
- [React Fundamentals](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-fundamentals.md): 20 questions, Junior
- [React Hooks](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-hooks.md): 22 questions, Junior
- [Component Lifecycle](https://sharpskill.dev/en/technologies/react-next/interview-questions/component-lifecycle.md): 18 questions, Junior
- [React Router](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-router.md): 20 questions, Junior
- [State Management with Context](https://sharpskill.dev/en/technologies/react-next/interview-questions/state-management-context.md): 18 questions, Junior
- [Forms & Controlled Components](https://sharpskill.dev/en/technologies/react-next/interview-questions/forms-controlled-components.md): 20 questions, Mid-Level
- [Data Fetching & API](https://sharpskill.dev/en/technologies/react-next/interview-questions/fetching-data-api.md): 20 questions, Mid-Level
- [React Query (TanStack Query)](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-query-tanstack.md): 20 questions, Mid-Level
- [Styling & CSS-in-JS](https://sharpskill.dev/en/technologies/react-next/interview-questions/styling-css-in-js.md): 18 questions, Mid-Level
- [Next.js Fundamentals](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-fundamentals.md): 25 questions, Mid-Level
- [TypeScript with React](https://sharpskill.dev/en/technologies/react-next/interview-questions/typescript-react.md): 20 questions, Mid-Level
- [Next.js Data Fetching](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-data-fetching.md): 24 questions, Mid-Level
- [Next.js Server Actions](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-server-actions.md): 20 questions, Mid-Level
- [Next.js Routing & Navigation](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-routing-navigation.md): 22 questions, Mid-Level
- [Next.js API Routes](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-api-routes.md): 20 questions, Mid-Level
- [Next.js Metadata & SEO](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-metadata-seo.md): 18 questions, Mid-Level
- [Next.js Middleware & Auth](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-middleware-auth.md): 22 questions, Mid-Level
- [React Testing](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-testing.md): 20 questions, Mid-Level
- [Zustand State Management](https://sharpskill.dev/en/technologies/react-next/interview-questions/zustand-state-management.md): 18 questions, Mid-Level
- [React Performance Optimization](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-performance-optimization.md): 22 questions, Senior
- [Error Boundaries & Error Handling](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-error-boundaries.md): 18 questions, Senior
- [Advanced React Patterns](https://sharpskill.dev/en/technologies/react-next/interview-questions/advanced-react-patterns.md): 20 questions, Senior
- [Next.js Advanced Features](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-advanced-features.md): 24 questions, Senior
- [Next.js Deployment & Production](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-deployment-production.md): 20 questions, Senior
- [React Server Components](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-server-components.md): 26 questions, Senior
- [Next.js Internationalization](https://sharpskill.dev/en/technologies/react-next/interview-questions/nextjs-internationalization.md): 20 questions, Senior
- [React Security & Best Practices](https://sharpskill.dev/en/technologies/react-next/interview-questions/react-security-best-practices.md): 22 questions, Senior

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