Portfolio ↗

Quiz

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

91 questions in Frontend & Experience Architecture.

  1. BFF for Experience intermediate Multiple choice

    Six product teams ship a web app and an iOS app against 23 domain services. A typical screen needs data from four to nine of them. Mobile releases take roughly three weeks to reach 90% of installs. Round-trip time on mobile networks is 60-150 ms. The platform team must pick one aggregation approach for the next two years. Which fits?

    2 min answer bffownershipapi-shapesversion-tail
  2. BFF for Experience intermediate

    Your mobile BFF now contains pricing logic, entitlement checks and order validation. What has gone wrong?

    2 min answer bffboundariesdrift
  3. Client Caching & Data Layer advanced

    A live scoreboard JSON endpoint is cached at the CDN with a 5-second TTL and polled every 5 seconds by each viewer. Peak concurrency for an Indian cricket final is in the range Hotstar publicly reported for the 2019 World Cup semi-final - 25.3 million concurrent viewers. Product wants the payload to include the viewer's own fantasy-team score. Roughly what request rate reaches the origin before and after that change?

    3 min answer cdncache-keyrequest-collapsingpolling
  4. Client Caching & Data Layer advanced

    A quick-commerce app must feel instant while showing inventory that changes constantly. What caching strategy on the client?

    2 min answer zeptoclient-cachestalenessrevalidation
  5. Client Caching & Data Layer intermediate

    A single-page application shows stale data after a user makes a change elsewhere in the product. How should client-side caching and invalidation be designed?

    2 min answer client-cacheinvalidationoptimistic-updatesstaleness
  6. Client Caching & Data Layer beginner

    A user renames their account. The settings page shows the new name at once. The dashboard still shows the old name after a full page navigation and corrects itself only after a hard reload or about 15 minutes. Two different caches are involved. Which is which and which one can application code not invalidate?

    2 min answer http-cachedata-layercache-controletag
  7. Client Caching & Data Layer advanced

    An image discovery application does heavy infinite scrolling with per-user recommendations. What should the client data layer provide?

    1 min answer client-cachingpaginationinvalidationmemory
  8. Client Caching & Data Layer intermediate

    Users complete an action and the interface still shows the previous value until they refresh. Diagnose.

    2 min answer frontendcachinginvalidation
  9. Client Feature Flags advanced

    A streaming platform delivers feature flags to clients. What happens when the flag service is slow or unreachable?

    1 min answer feature-flagsavailabilitydefaultscaching
  10. Client Feature Flags advanced

    A web application evaluates feature flags in the browser. A flag is turned on for 10% of users and the new code throws during application start-up, so those users see a blank page. Turning the flag off does not help them. Why not, and what is the structural fix?

    4 min answer feature-flagsbootstrapcrash-loopkill-switch
  11. Client Feature Flags advanced

    How do client-side feature flags differ from server-side ones, and what breaks if you ignore the difference?

    2 min answer feature-flagsclientofflinestaleness
  12. Client Feature Flags beginner

    You turn off a feature flag evaluated in the browser. Some users keep seeing the old behaviour for hours. Why, and what should the design do about it?

    2 min answer feature-flagscachingpropagationclient-architecture