Design Systems
204 bites tagged Design Systems — interview questions with model answers, and 60-second explainers.
Tracking design system component usage and versions
Static scan of code or lockfiles, a central reporting store, and a dashboard; data drives deprecation and roadmap. building adoption telemetry across many apps. only counting npm downloads as real usage.
First steps to deprecate a legacy component
Add a JSDoc @deprecated tag and IDE/console warning, document the migration, and keep the component working. knowing how to signal deprecation without breaking users. deleting it immediately.
SemVer bump for a non-breaking bug fix
A backward-compatible bug fix is a PATCH, the third number; major is breaking, minor is new compatible features. Whether you know SemVer's three levels. Calling a fix a minor or bumping major out of caution.
Quantifying the cost of a missing component
Scan repos for duplicate hand-rolled tables, count implementations and lines, estimate redundant build and maintenance hours plus defect rates. Whether you justify investment with evidence of waste.
Isolating the design system's velocity impact
Use comparison groups, difference-in-differences or before-after baselines, and control for confounders; cite mechanism data like component reuse. Whether you can argue causation, not correlation.
Constructing a design system ROI formula
ROI equals (benefits minus cost) over cost; benefits from time saved, defect reduction, and faster onboarding; gather data via analytics and tickets. Whether you can frame the system as an investment.
Quantifying migration cost for a major release
Pre-release, scan codebases for affected usages and estimate engineer-hours; post-release, track actual upgrade lead time and effort. Whether you can estimate and measure migration effort.
Designing a UI consistency score
Combine signals like token vs hard-coded values, design-system vs off-system components, and override rates, then automate via AST scans and CI. Whether you can quantify consistency objectively.
Tracking design system adoption technically
Scan codebases for component imports via AST, compute adoption versus off-system usage, and aggregate into a dashboard over time. Whether you can instrument adoption with real data.
Governance model for specialized contributions
Define a governance model, RFC and shared-need gate, tiered intake (core vs community), CI and CODEOWNERS review, then versioned release. Whether you can govern contributions of varied scope.
Essential docs for onboarding a new team
Getting-started guide, per-component API and usage docs, design guidelines and tokens, plus changelog and migration notes. Whether you can make a system self-serve.
Bug report to deployed fix workflow
Triage and reproduce, write a failing test, fix it, pass CI gates and review, then patch-release and notify. Whether you have a disciplined bug-fix pipeline.
Designing a component deprecation process
Announce with a replacement and timeline, mark deprecated with runtime and lint warnings, provide codemods, then remove only in a major release. Whether you can retire a component without breaking consumers.
Classifying a visually breaking padding change
A layout-shifting padding change is effectively breaking, so major; release with visual diffs, a migration note, and a token or opt-in path. Whether you grasp that visual changes can be breaking.
Purpose and key sections of CONTRIBUTING.md
It documents how to contribute; key sections are setup and dev workflow, contribution process and standards, and review and release expectations. Whether you lower the barrier to good contributions.
Deciding whether a one-off variant belongs in core
Weigh reuse and consistency against maintenance cost, then decide with a shared-need bar and escape hatches for local cases. Whether you guard the core against bloat. Reflexively adding every requested variant to core.
Contributor workflow from proposal to merge
Proposal or RFC, design and core alignment, branch and build with tests and docs, review, then merge and release. Whether you know the end-to-end contributor path. Opening a PR for a new component with no prior alignment.
Reversing stagnating design system adoption
Find friction via interviews, reduce it with DX, codemods, and docs, then prove value with adoption and velocity metrics. Whether you treat adoption as a product problem.
Building a design system quarterly roadmap
Combine usage and adoption data, support tickets, stakeholder interviews, and a debt ledger into a scored backlog with a deliberate debt allocation. Whether you prioritize with evidence, not opinion.
Designing a contribution model with quality gates
Define a federated model, branch-and-PR flow, required reviews, and automated gates for tests, a11y, and visual regression. Whether you can open contributions without losing quality.
Process for adding a new component
Triage need, design and spec, build with a11y and tests, document, version, and release. Whether you have a repeatable intake-to-release process. Letting teams build one-offs with no review or shared ownership.
Core roles on a design system team
Name design, engineering, product/PM, and accessibility/docs roles with clear ownership. Whether you see a design system as a product. Treating it as a side project with no dedicated owners.
Shadow DOM accessibility: focus and cross-boundary ARIA
IDREF ARIA can't cross the shadow boundary, so aria-labelledby and aria-activedescendant break; delegatesFocus and ElementInternals/ARIAMixin help. Shadow DOM a11y limits. assuming ARIA id references work across shadow roots.
Adapting CSS for Forced Colors Mode
Use semantic HTML and system color keywords, the forced-colors media query, forced-color-adjust sparingly. supporting forced-colors accessibility. ignoring it, or assuming background images and box-shadows still convey state.
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