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2707 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2707 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

34 questions in Frontend & Experience Architecture.

  1. Component Contracts intermediate

    A team asks for a new prop on a shared component. When do you say no, and what do you offer instead?

    2 min answer design-systemapi-surfacecompositioncontracts
  2. Component Contracts intermediate

    What makes a shared component's interface stable enough that consumers can upgrade without breakage?

    1 min answer component-apicontractsversioningcomposition
  3. Core Web Vitals intermediate

    A commerce platform's field performance metrics are poor. Which improvements have the largest effect on conversion?

    2 min answer nykaaweb-vitalsfield-dataconversion
  4. Core Web Vitals intermediate

    A single-page application scores well in the lab and users on mid-range Android phones say it is unusable. Diagnose.

    2 min answer performancefrontendmeasurement
  5. Core Web Vitals intermediate

    Mobile conversion is 40% below desktop. Product blames the design; analytics shows users leaving before the page is usable. How do you investigate?

    2 min answer performancefrontendfield-dataconversion
  6. Core Web Vitals intermediate

    You want a 2.5 second largest contentful paint at the 75th percentile on mid-range Android over a typical mobile connection. Roughly how much JavaScript can you ship on the critical path, and which assumption dominates the error?

    3 min answer core-web-vitalsperformance-budgetjavascriptmobile
  7. Design Systems intermediate

    A design system exists, is well built, and teams keep building their own components anyway. What is the diagnosis?

    1 min answer design-systemsadoptionapi-designgovernance
  8. Design Systems intermediate

    A design system is adopted and product teams still build their own components. What is the diagnosis?

    2 min answer postmandesign-systemadoptionescape-hatch
  9. Design Systems intermediate

    Three product teams have forked the design system to meet deadlines. Components have diverged. How do you recover?

    2 min answer design-systemadoptiongovernance
  10. Design Systems intermediate

    Your design system is used by three of eleven applications. The other eight built their own components. What do you do?

    2 min answer design-systemadoptionfrontendplatform
  11. Frontend & Experience Architecture intermediate

    What decides whether a product should render on the server or the client?

    2 min answer renderingperformancedevicesseo
  12. Hydration Cost intermediate Multiple choice

    An article page is server-rendered React. Field p75 interaction to next paint is 420 ms on mid-range Android and the main thread is busy for roughly 1.9 seconds after the HTML arrives. Three widgets account for most of the client bundle - a comment thread a video player and a recommendation carousel. Fewer than 5% of readers open comments. Which change gets interaction to next paint under 200 ms with the least risk?

    2 min answer hydrationinpislandscore-web-vitals