Executives need fast summaries while analysts need exact customer counts and transaction drillthrough. How would you design one trustworthy experience?

Instruction: Senior-level, open-ended case. Several approaches can be defensible; explain your assumptions, recommendation, tradeoffs and what evidence would change your choice. Name the important summary queries, freshness requirement and resource constraints in your example. Use measured timings only if you actually have them, and explain which requests are permitted to use detail queries. For a mock interview, allow two minutes for your first answer, then 30 seconds to respond to the pressure-test twist. State what changed, your next action and what you cannot safely promise.

Context: This open-ended senior case assesses decision quality. Balances exactness, grain, cache size, freshness and detail access, and requires evidence that the optimization improves the real workload without changing business results.

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I’d start with the query patterns and the meaning of “exact.” Monthly revenue by region, unique customers across a date selection, and an individual transaction lookup need different levels of detail. We also need an agreed freshness limit and response-time target under expected concurrent use. If a reduced, well-designed Import model fits the available resources and refresh window, that may be the simplest experience...

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