CSS-in-JS

Uses CSS-in-JS at a basic level. Creates simple components from design. Understands basic concepts and follows component guidelines.

Uses CSS-in-JS at a basic level. Creates simple components following design specs. Understands basic concepts and follows component guidelines.

Uses CSS-in-JS at basic level. Creates simple components from design. Understands basic concepts and follows component guidelines.

Implements complex React UI components using styled-components or Emotion with dynamic theming and responsive styles. Optimizes rendering performance by avoiding unnecessary style recalculations. Writes unit tests for styled components and applies proper CSS-in-JS patterns for state-driven styling.

Applies CSS-in-JS approaches within Svelte component styling, using scoped styles with dynamic class bindings and CSS custom properties. Optimizes rendering performance by leveraging Svelte's compile-time style optimization. Integrates design tokens and writes tests for component visual states.

Implements complex Vue components using CSS-in-JS libraries (e.g., vue-styled-components) or scoped styles with dynamic bindings. Optimizes rendering by minimizing style recalculations in reactive contexts. Applies proper patterns for theme switching and state-driven styling in Vue SFCs.

Designs React design system architecture with CSS-in-JS: token-based theming, variant APIs, and compound component patterns. Optimizes bundle size through static extraction and critical CSS strategies. Implements accessible, performant component libraries meeting Core Web Vitals targets.

Designs Svelte design system architecture combining scoped CSS with CSS-in-JS patterns for cross-project consistency. Optimizes bundle size and Core Web Vitals through Svelte's zero-runtime CSS approach. Creates reusable, accessible component libraries with comprehensive theming and variant support.

Designs Vue design system architecture with CSS-in-JS integration: token-based theming, variant composition, and style isolation patterns. Optimizes bundle size and Core Web Vitals through tree-shaking and critical CSS extraction. Builds accessible, reusable component libraries for the organization.

Defines product-level CSS-in-JS architecture for React applications: selects styling solutions (runtime vs zero-runtime), establishes theming contracts, and enforces design token standards. Conducts architectural reviews ensuring performance, accessibility, and maintainability across teams.

Defines product-level styling architecture for Svelte applications: evaluates CSS-in-JS approaches vs Svelte native styling, establishes design token standards, and sets component styling guidelines. Conducts reviews ensuring consistent, performant, and accessible UI across all teams.

Defines product-level CSS-in-JS architecture for Vue applications: evaluates styling strategies (SFC scoped vs CSS-in-JS libraries), establishes design token governance, and sets component API standards. Conducts architectural reviews ensuring scalable, accessible, and performant styling across teams.

Defines CSS architecture strategy for the React application ecosystem: choosing between Tailwind CSS, CSS Modules and styled-components considering Server Components compatibility. Designs zero-runtime solutions for SSR, standardizes design tokens and theming across the organization.

Defines strategy for choosing between Svelte scoped styles, Tailwind CSS, and CSS-in-JS solutions at the organizational level. Researches performance of different styling approaches in the Svelte compiler context, develops migration recommendations between styling systems.

Defines styling strategy for company's Vue ecosystem — zero-runtime CSS-in-JS through UnoCSS, atomic CSS approach with Tailwind, design token integration. Researches and introduces advanced approaches — CSS Layers, Container Queries, View Transitions API in Vue components.