ui-engineering-and-design-systems

UI Engineering And Design Systems

Use When

• Building or modifying pages/components
• Creating shared UI primitives or design tokens
• Fixing accessibility, responsiveness, or performance regressions

Workflow

1. Define user outcome and interaction states (loading, empty, error, success).
2. Identify reusable primitives before creating one-off components.
3. Implement with semantic HTML and keyboard accessibility.
4. Ensure responsive behavior across breakpoints.
5. Verify with linting, tests, and visual checks.

Required Checks

• ARIA usage is minimal and correct
• Focus order is preserved
• Color contrast and hit targets are acceptable
• Bundle impact is justified
• Critical user paths are covered by tests

Decision Framework

• Prefer the simplest architecture that preserves maintainability under team growth.
• Make rendering, state, and API boundary decisions explicit before implementation.
• If a feature affects critical user journeys, require performance and accessibility checks.
• If introducing dependencies, justify bundle and long-term maintenance cost.

Common Rationalizations And Rebuttals

• "We can optimize later." -> Performance debt compounds quickly; set budgets now.
• "Accessibility is polish." -> Accessibility is core behavior and should ship with the feature.
• "One global state store is easiest." -> Over-centralization increases coupling and slows iteration.

Evidence Pack

• UX state coverage (loading, empty, error, success) for changed flows
• Accessibility checks for keyboard, focus, and semantics
• Performance snapshot for key routes or interactions
• Test evidence for critical user paths

Exit Criteria

• Workflow decisions are documented and implementation-ready
• Validation evidence exists for quality, reliability, and compatibility
• Operational readiness and rollback expectations are explicit