All About UI Aspects

🧱 1. Architecture & Design System

• Use Atomic Design principles (atoms → molecules → organisms)
• Component-driven development (Storybook, isolated environments)
• Establish centralized design tokens (color, spacing, typography)
• Synchronize with Figma via tokens or plugins
• Adopt folder structure supporting scalability and reusability
• Use Tailwind CSS tokens or CSS variables with fallback

🧩 2. Component Quality

• Reusable, composable, and self-contained components
• Stateless vs stateful responsibility split
• Polymorphic components (e.g., as="a" or button)
• Composition patterns: slots, children-as-function, render props
• Strict and descriptive prop typing with TypeScript
• Support accessibility out of the box (via props or roles)
• Handle default props, controlled/uncontrolled patterns
• Emit appropriate events/callbacks with naming conventions

🎯 3. User Experience (UX)

• Mobile-first and responsive UI
• Accessible and keyboard-friendly navigation
• Well-defined empty/loading/error states
• Optimistic UI with rollback on failure
• Smooth, non-blocking transitions and animations
• Tooltips, contextual feedback, inline validation
• Visual consistency in spacing, typography, and structure

♿ 4. Accessibility (a11y)

• WCAG 2.1+ compliance checklist integration
• Semantic HTML usage (e.g., button > div)
• Label associations using for, aria-labelledby
• Contrast ratio checks for text/background
• Full keyboard navigation support
• Screen reader support (ARIA roles, live regions)
• Focus ring and trap for modals and popovers
• Test using Lighthouse, axe, and manual tools

🧪 5. Testing Strategy

• Unit tests with Jest or Vitest
• Component tests with React Testing Library
• End-to-end tests with Playwright or Cypress
• Accessibility tests with axe-core or jest-axe
• Visual regression testing with Percy or Chromatic
• Snapshot testing with limits and purpose
• Test coverage tracking and regression protection

🚀 6. Performance Optimization

• Code splitting with lazy loading
• Tree shaking and dead code elimination
• Memoization via React.memo, useMemo, useCallback
• Virtualization for lists/grids (e.g., react-window)
• Compressed, optimized images and fonts
• Avoid layout thrashing (composite vs layout)
• Monitor Lighthouse, Core Web Vitals, bundle size

🛠️ 7. Tooling & Dev Infrastructure

• ESLint, Prettier, Stylelint integration
• TypeScript in strict mode
• Bundlers like Vite, Turbopack, or esbuild
• Pre-commit hooks (husky, lint-staged)
• CI with test + lint + build workflows
• Auto-preview deployments (Vercel, Netlify, GitHub Actions)
• Alias support for imports (@components, @utils)

🛡️ 8. Security

• Sanitize dynamic content (user-generated HTML)
• Avoid dangerouslySetInnerHTML or sanitize before usage
• CSRF/XSS prevention
• CSP headers configuration
• Secure cookie and local/session storage handling
• Input validation on frontend and backend
• Masking sensitive UI states (tokens, passwords)

📦 9. State Management

• Local state via useState, useReducer
• Global state via Zustand, Redux, Recoil, or Jotai
• Async state (React Query, SWR)
• Context API for scoped/global configuration
• Separate view state from business logic state
• Persistence/local sync (useLocalStorage or custom)

📚 10. Documentation & Developer Experience

• Storybook stories for all components and variants
• Autogenerated prop tables
• Live playgrounds or sandboxes
• Internal usage documentation or wiki
• Docs for custom hooks, design tokens, patterns
• Internal changelogs and migration guides
• CLI tools for scaffolding components

🌐 11. Internationalization (i18n)

• Language file-based architecture (i18next, Lingui, etc.)
• Pluralization and date/currency formatting
• RTL layout support
• Lazy loading of translation bundles
• Language switcher with local fallback
• Locale detection via headers or settings

🔍 12. SEO & Metadata

• Semantic heading structure (h1 to h6)
• Dynamic meta tags: title, description, OpenGraph, Twitter
• Structured data (schema.org JSON-LD)
• Canonical URL tags and robots.txt setup
• Sitemap.xml generation
• 404 page and route fallbacks
• Accessibility + SEO synergy (titles, alt tags, links)

🧾 13. Analytics & Event Tracking

• Click/interaction tracking (buttons, forms, etc.)
• Analytics hooks abstraction
• GDPR/CCPA cookie consent handling
• Naming conventions for events
• Funnel tracking (Amplitude, Mixpanel)
• Heatmaps (Hotjar, PostHog)

🧭 14. Theming & Customization

• Light/Dark mode toggle (with persistence)
• Token-based theming (colors, radius, shadows)
• CSS variables or Tailwind config for theming
• Per-tenant or white-label theming
• Theme context with runtime updates

🧳 15. Multi-Tenancy & Role-Aware UI

• Role-based route and UI guards
• Brand-aware UI (logo, theme, metadata)
• Scoped access to components/features
• Tenant-specific overrides
• Session-based layout isolation

🔁 16. Versioning, Releases, Feature Flags

• Semantic versioning (semver)
• Remote feature flags (LaunchDarkly, Unleash)
• Canary releases, A/B tests
• Changelog generation and internal comms
• Rollback workflows for unstable features

📶 17. Offline & Network Resilience

• Retry with exponential backoff
• Offline mode and local caching
• Save drafts offline (IndexedDB)
• Detect connectivity state and inform user
• AbortController for stale API calls
• PWA readiness (service workers)

🔌 18. Third-party Integrations

• OAuth states (loading, error, success)
• Resilient loading for widgets (Stripe, Maps, etc.)
• Integration hooks for external systems
• Timeout/fallback states for 3rd-party failures

🧵 19. Async + Concurrency-Safe UI

• Prevent race conditions with AbortController
• Safeguard async closures with useRef/flags
• Suspense boundaries (React 18+)
• Prioritize critical loaders (skeletons > spinners)
• Visual loading feedback for async UX

🗺️ 20. Navigation & Routing

• Scroll position restoration
• Deep linking with query param hydration
• Modal routing and hash-based flows
• Dynamic nested routes (React Router, Next.js)
• Breadcrumb support and back button control

📱 21. Progressive Web App (PWA)

• Service workers for offline support
• Web manifest for installable app
• Splash screen and app icons
• Optional push notifications
• Mobile gesture support and scaling

🧠 22. Onboarding & First-Time UX

• First-time walkthroughs or modals
• Coach marks with step indicators
• Tooltips for complex or new features
• In-app changelog or “what’s new” announcement

📐 23. Pixel-Perfect UI

• 8pt grid or modular spacing system
• Typography scale consistency
• Layout alignment with Figma
• Icon sizing, spacing, and padding consistency
• Baseline grid adherence

🔎 24. Dev & Runtime Monitoring

• Error boundaries
• Logging (Sentry, LogRocket, Datadog)
• Real User Monitoring (LCP, CLS, FID)
• Console deprecation warning audits
• Custom logging hooks (useLogger)

🔒 25. Privacy-First Design

• Minimize personal data collection
• Local-first storage (IndexedDB, SQLite, ZK)
• Opt-in tracking only
• Optional ZK integration for sensitive UI states
• Clear user-visible data permissions/settings

🧰 26. Reusable Abstractions & Hooks

• Domain-specific hooks (useCart, useAuth)
• Shared layout primitives (<Stack>, <Grid>)
• Utility hooks (useDebounce, useClipboard)
• Adapter/mappers for API → UI response format

🎛️ 27. Component Finite State Machines

• Use XState or statecharts for complex flows
• Predictable UI state transitions
• Ideal for multistep, form, and modal UIs

📄 28. Printable & Exportable UI

• PDF/CSV export support
• Print-friendly stylesheets
• SVG/Canvas export for diagrams
• Custom layouts for printed output

🧪 29. Visual Testing & QA

• Storybook snapshot testing
• Visual regression via Percy/Chromatic
• QA/UAT checklists
• Role-based UI test flows

🧭 30. Final Developer Experience (DX)

• Hot reload and Fast Refresh
• API mocking via MSW/MirageJS
• Sandbox templates for rapid prototyping
• Dev toggles (themes, flags, mock states)
• Tight feedback loops for testing, linting, commits