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Amazon·Data Scientist·Technical Phone Screen·Intermediate

Intermediate
May 2026

Summary

Second-round interview for a Data Scientist role at Amazon that centered on a live data visualization critique. They put a customer-conversion chart in front of me and basically said, go.

Questions Asked (1)

Q1

You're shown a customer-conversion chart. What problems do you see with it, and how would you redesign or improve it? Walk through the tradeoffs of your proposed changes.

Product Analytics & MetricsTechnical Trade-offsProduct Sense & Ideation
Author's notes

I jumped straight to chart type and forgot to say anything about the axes for an embarrassingly long time.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the chart's purpose and audience, then systematically critique it across data integrity, visual encoding, and clarity dimensions. Propose specific redesigns that address each issue, and explicitly discuss tradeoffs such as simplicity vs. detail and accuracy vs. aesthetics. Conclude by tying improvements back to better decision-making for the business.

Pro tip: Frame your critique around how the chart could mislead stakeholders or lead to suboptimal decisions, and always quantify the impact of your proposed changes where possible (e.g., 'reducing clutter could cut interpretation time by 30%').

1. Clarify Purpose and Audience

Ask or infer who will use the chart and what decision it should support. This ensures your critique and redesign are aligned with business needs.

2. Identify Issues Systematically

Evaluate the chart for problems in data accuracy, visual encoding (e.g., truncated axes, misleading scales), clarity (e.g., clutter, poor labels), and context (e.g., missing benchmarks).

3. Propose Redesign Solutions

Suggest specific improvements such as changing chart type, fixing axes, simplifying design, adding annotations, or using small multiples. Prioritize changes by impact.

4. Discuss Tradeoffs

For each proposed change, explain the tradeoffs: e.g., simplicity vs. detail, accuracy vs. aesthetics, or development effort vs. benefit. Show awareness of constraints.

5. Connect to Business Impact

Summarize how the redesigned chart will lead to better insights, faster decisions, or reduced misinterpretation, tying back to Amazon's customer-obsession and data-driven culture.

Key Points to Mention

  • Data integrity: check for truncated y-axis, inconsistent scales, or missing data points that could mislead.
  • Visual encoding: ensure appropriate chart type (e.g., line for trends, bar for comparisons), clear labels, and minimal clutter.
  • Context: add benchmarks, targets, or confidence intervals to aid interpretation.
  • Accessibility: consider colorblind-friendly palettes and clear fonts.
  • Tradeoffs: simplicity vs. detail, accuracy vs. aesthetics, and effort vs. impact.
  • Business relevance: align redesign with stakeholder needs and decision-making processes.

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.