1. Functional vs Non-Functional intermediate Multiple choice

    "Place an order" and "an order placed during the market open surge is acknowledged within 200ms at p99" — Zerodha needs both. Which one actually constrains the architecture, and why is that not obvious?

    1 min answer nfrzerodhatradinglatency
  2. Game Days intermediate

    Design a game day for a payment service. What is the scenario, who is in the room, and what counts as success?

    2 min answer game-dayrehearsalincident-responsereadiness
  3. Game Days intermediate

    You have four hours, eight engineers and a payments platform that has never had a game day. Design the exercise. Be specific about what you inject, what you measure, and how you decide whether it succeeded.

    4 min answer game dayschaos engineeringhypothesisincident response
  4. Geo-Restriction & Sanctions intermediate Multiple choice

    A trading platform must prevent sanctioned parties and prohibited jurisdictions from using the service. Geo-IP blocking is in place at the edge, and compliance reports that sanctioned individuals are still being onboarded. Where should the primary enforcement point be?

    3 min answer sanctionsscreeninggeo-blockingkyc
  5. GitOps intermediate

    A platform adopts a declarative, git-driven deployment model. What does it improve, and what does it not solve?

    2 min answer gitopsdeclarativedriftreconciliation
  6. GitOps intermediate

    A platform manages infrastructure declaratively and production has diverged from the declarations. Is that a failure of discipline?

    2 min answer rendergitopsdriftincident
  7. GitOps intermediate

    You are adopting GitOps. Someone asks how secrets work, since the repository is the source of truth. What are the options and which do you choose?

    2 min answer gitopssecretssecurity
  8. Graceful Degradation intermediate Multiple choice

    A recommendation service is unavailable during a high-traffic period. Should the application show popular items, cached recommendations, results from an older model, or nothing at all?

    2 min answer graceful-degradationfallbackpersonalisationreddit
  9. Graceful Degradation intermediate

    A streaming service's homepage assembles rows from a dozen personalisation services. One returns 4-second latency instead of 40 ms. What happens, and what should have been designed?

    2 min answer netflixfallbacktail-latencyfan-out
  10. Graceful Degradation intermediate

    The recommendation service is down. Walk through every level of degraded response and say who decides which one is used.

    2 min answer degradationfallbacknetflixproduct
  11. Graceful Degradation intermediate

    What distinguishes a real graceful-degradation capability from an aspiration, and how do you design and validate a degradation ladder?

    3 min answer degradationkill-switchfallbackresilience
  12. Graceful Degradation intermediate

    What happens to your marketplace if the payment provider is unavailable for two hours during peak?

    2 min answer marketplacedependencydegradationbusiness