Architect: Migration Strategy
architect: migration strategy migration strategy — 25 interview questions with traps, follow-ups, and production context. practice out loud; staff loops
Introduction
Migration Strategy — 25 interview questions with traps, follow-ups, and production context. Practice out loud; staff loops reward trade-offs, not definitions.
Business problem
Business pressure: Product teams need Migration Strategy interview questions to ship polished UI without layout regressions, accessibility lawsuits, or LCP regressions that hurt conversion.
- Conversion: Visual polish and performance directly affect checkout and signup funnels.
- Brand: Inconsistent Migration Strategy interview questions implementation fragments design system trust.
- Velocity: CSS debt slows every feature team — architecture matters at scale.
Why this feature exists
Platform history: CSS evolved Migration Strategy interview questions to solve author needs without JavaScript layout engines or table hacks.
- Problem solved: Declarative styling separated from document structure.
- Rejected alternative: Inline styles and JS layout — unmaintainable at enterprise scale.
Browser rendering perspective
Rendering impact: Migration Strategy interview questions affects style recalculation, layout, paint, and composite stages in the browser pipeline.
- Chrome (Blink): Style → LayoutNG → Paint → Viz compositor.
- Firefox (Gecko): Servo-based stylo + WebRender compositing.
- Safari (WebKit): WebKit style resolver + GPU layer promotion rules.
Internal browser workflow
Workflow: Selector match → cascade → computed values → layout tree → paint layers → composite.
Real production example
Production: Netflix, Amazon, and Shopify enforce Migration Strategy interview questions patterns via design tokens, lint rules, and visual regression CI.
Enterprise use case
Enterprise: Design systems (Polaris, Carbon, Atlassian) codify Migration Strategy interview questions in token pipelines and component APIs.
Accessibility considerations
A11y: CSS must not remove focus visibility, break zoom, or convey state by color alone (WCAG 2.2).
Performance considerations
Performance: Migration Strategy interview questions can trigger reflow, expensive selectors, or layer explosion — profile with DevTools Performance panel.
SEO considerations
SEO: CSS affects LCP, CLS, and mobile usability — ranking signals tied to Core Web Vitals.
Scalability considerations
Scale: Migration Strategy interview questions choices compound across micro-frontends, white-label tenants, and dark-mode variants.
Common production issues
Production failures: Specificity wars, z-index stacks, and responsive breakpoints that work in Chrome but break Safari.
Debugging guide
Debug: Chrome DevTools → Elements (computed styles), Layout panel, Rendering layers, Coverage for unused CSS.
Interview questions
Architect — Migration Strategy: How do you decide and govern strangler fig CSS?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 1: 45-min plan for strangler fig CSS across 40 teams.
Architect — Migration Strategy: How do you decide and govern big bang rewrite risk?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 2: 45-min plan for big bang rewrite risk across 40 teams.
Architect — Migration Strategy: How do you decide and govern dual-write period?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 3: 45-min plan for dual-write period across 40 teams.
Architect — Migration Strategy: How do you decide and govern visual regression baseline?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 4: 45-min plan for visual regression baseline across 40 teams.
Architect — Migration Strategy: How do you decide and govern codemod token rename?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 5: 45-min plan for codemod token rename across 40 teams.
Architect — Migration Strategy: How do you decide and govern incremental pod migration?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 6: 45-min plan for incremental pod migration across 40 teams.
Architect — Migration Strategy: How do you decide and govern legacy global selector inventory?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 7: 45-min plan for legacy global selector inventory across 40 teams.
Architect — Migration Strategy: How do you decide and govern specificity debt metrics?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 8: 45-min plan for specificity debt metrics across 40 teams.
Architect — Migration Strategy: How do you decide and govern parallel run old new UI?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 9: 45-min plan for parallel run old new UI across 40 teams.
Architect — Migration Strategy: How do you decide and govern feature flag skin swap?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 10: 45-min plan for feature flag skin swap across 40 teams.
Architect — Migration Strategy: How do you decide and govern rollback migration?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 11: 45-min plan for rollback migration across 40 teams.
Architect — Migration Strategy: How do you decide and govern team training migration?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 12: 45-min plan for team training migration across 40 teams.
Architect — Migration Strategy: How do you decide and govern timeline 18 month realistic?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 13: 45-min plan for timeline 18 month realistic across 40 teams.
Architect — Migration Strategy: How do you decide and govern measure adoption percent?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 14: 45-min plan for measure adoption percent across 40 teams.
Architect — Migration Strategy: How do you decide and govern block new global CSS?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 15: 45-min plan for block new global CSS across 40 teams.
Architect — Migration Strategy: How do you decide and govern eslint stylelint gates?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 16: 45-min plan for eslint stylelint gates across 40 teams.
Architect — Migration Strategy: How do you decide and govern migrate Bootstrap to DS?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 17: 45-min plan for migrate Bootstrap to DS across 40 teams.
Architect — Migration Strategy: How do you decide and govern migrate LESS to tokens?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 18: 45-min plan for migrate LESS to tokens across 40 teams.
Architect — Migration Strategy: How do you decide and govern iframe temp isolation?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 19: 45-min plan for iframe temp isolation across 40 teams.
Architect — Migration Strategy: How do you decide and govern documentation migration guide?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 20: 45-min plan for documentation migration guide across 40 teams.
Architect — Migration Strategy: How do you decide and govern executive reporting migration?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 21: 45-min plan for executive reporting migration across 40 teams.
Architect — Migration Strategy: How do you decide and govern risk register CSS debt?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 22: 45-min plan for risk register CSS debt across 40 teams.
Architect — Migration Strategy: How do you decide and govern architect trap stop the line rewrite?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 23: 45-min plan for architect trap stop the line rewrite across 40 teams.
Architect — Migration Strategy: How do you decide and govern post-migration delete dead CSS?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 24: 45-min plan for post-migration delete dead CSS across 40 teams.
Architect — Migration Strategy: How do you decide and govern celebrate pod completions?(Architect)
Staff-level answer frames stakeholders, rejected alternatives, metrics (velocity, CLS, a11y defects, adoption %), and rollback. Interview trap: jumping to tooling without organizational leverage — name who owns tokens, who approves exceptions, and how pods migrate without big-bang.
Follow-up: Whiteboard 25: 45-min plan for celebrate pod completions across 40 teams.
Hands-on exercise
Mock interview drill: Answer all 25 questions out loud in 45 minutes. Record yourself explaining trade-offs, not just definitions.
Try it yourself
Edit the CSS panel — the preview updates live. Use DevTools Performance and Accessibility panels to validate.