Design System & UI Engine

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.