Trade-Off Analysis and Justification Questions

Ability to identify key nonfunctional requirements and constraints and to compare alternative designs with clear, quantitative reasoning. Expect discussion of consistency versus availability, latency versus throughput, cost versus performance, operational complexity, and implementation risk. Candidates should demonstrate how to quantify trade offs using metrics such as latency percentiles, throughput, cost per request, and availability targets, how to choose appropriate consistency models and failure modes, and how to document and justify the selected architecture given product and business priorities.

EasyTechnical

63 practiced

Describe a repeatable numeric method you would use to prioritize competing nonfunctional requirements across teams (for example: latency vs redundancy vs cost vs security). Walk through a short example with numeric weights and show how you would resolve stakeholder disagreements using the result.

MediumTechnical

64 practiced

You must choose between two instance types for a latency-sensitive API. Type A: $0.30/hr, handles 500 RPS at p99=80ms. Type B: $0.50/hr, handles 900 RPS at p99=40ms. Expected average load is 50,000 req/min with 3x peak. Which instance type minimizes cost per 1,000,000 requests while meeting SLO p99 < 100ms? Show calculations, assumptions, and safety margin you would apply.

EasyTechnical

62 practiced

As a Business Operations Manager for a customer-facing distributed service, define the key nonfunctional requirements (NFRs) you would track. For each NFR, (a) explain why it matters to the business, and (b) give one concrete metric (SLI) you would use to quantify it. Provide at least five NFRs and briefly state how you would report them to executives.

EasyTechnical

61 practiced

A proposal would add a read-through cache in front of a product-catalog API to reduce latency, but it may introduce up to 10 seconds of staleness for inventory updates. As Business Operations Manager, list the questions you would ask, define acceptance criteria, and describe the experiments and metrics required before approving the deployment.

MediumSystem Design

73 practiced

Prepare a short analysis comparing active-active and active-passive multi-region deployments for a consumer web app with users in North America and Europe. Assume each region independently has 99.95% availability. Under the independent-failure assumption compute combined availability for active-active and explain the effect of failover time on active-passive availability. Discuss latency, consistency, and cost trade-offs.

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