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Layer 17 of 20

Design System & UI Engine

UI primitives and tokens: component library, theming, motion, interaction standards, and cross-platform design consistency.

Responsibilities

  • Provide UI primitives, tokens, and interaction standards.
  • Ensure cross-platform visual consistency and theming.
  • Keep UI changes safe via reuse and component governance.

Key interfaces

  • Design tokens (colors, spacing, typography) and component APIs.
  • Motion/animation standards respecting reduced-motion preferences.
  • Accessibility semantics baked into components.

Operational signals

These are the measurements that tell you whether this layer is healthy in production.

  • UI bundle size and regressions.
  • CLS/INP changes across releases.
  • Accessibility issue count over time.

Failure modes

  • Component divergence and duplicated patterns.
  • Unbounded UI bundle growth.
  • Breaking changes to widely-used primitives.

Production readiness checklist

  • Keep tokens centralized; avoid one-off styling in critical paths.
  • Measure performance budgets and enforce in CI.
  • Version component contracts and document usage patterns.
Design System & UI Engine — HOWFAR Architecture — HOWFAR