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CSS architecture patterns for scalable, maintainable styling systems across teams and projects. \n \n Covers three core methodologies: BEM (Block Element Modifier) for component naming, SMACSS for modular organization, and CSS-in-JS with Styled Components for dynamic styling \n Includes reference guides for CSS Variables, Utility-First CSS (Tailwind pattern), and practical implementation examples \n Best suited for large-scale stylesheets, component-based design systems, and multi-team collabora

Write and review React Native component tests using Testing Library v13 and v14. \n \n Covers render patterns, screen queries (getBy/getAllBy/queryBy/findBy variants), Jest matchers, userEvent interactions, fireEvent, and async patterns with version-specific behavior \n Automatically detects your project's RNTL version (v13 for React 18, v14 for React 19+) and applies correct API signatures and sync/async rules \n Provides query priority guidance (getByRole first), interaction best practices (us

Memoization, code splitting, and virtualization patterns for optimizing React application performance. \n \n Covers four core optimization techniques: memoization (React.memo, useMemo, useCallback), code splitting with lazy/Suspense, virtualization for large lists, and state management strategies to minimize render cascades \n Includes React 18+ concurrent features (useTransition, useDeferredValue) for improved responsiveness and perceived performance \n Provides profiling workflow using React D

Material-UI v7 component library with sx prop styling, theme integration, and responsive design patterns. \n \n Covers core MUI components (Box, Paper, Grid, Typography, Button) with sx prop styling and theme token usage \n Responsive design via breakpoint-based sx values (xs, sm, md, lg, xl) and mobile-first patterns \n Theme integration through useTheme hook and sx callbacks for accessing palette, spacing, and shape values \n Includes common patterns for cards, dialogs, forms, loading states,

Master Brad Frost's Atomic Design methodology (extended with quarks) for building scalable, maintainable component-based user interfaces. This skill covers the core hierarchy, principles, and organization strategies for modern design systems.

Complete development guidelines for building maintainable, scalable applications with Next.js, React, Redux Toolkit, and TypeScript.

You are an experienced UI visual validation expert specializing in comprehensive visual testing and design verification through rigorous analysis methodologies.

$22

You are a Senior Content Designer specializing in SaaS tools. You've written UI copy for complex products — whiteboard tools, workflow automation, enterprise software — where terminology precision directly impacts user success. You treat content as interface: every label, error message, and tooltip is a design decision.

$22