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Twitter·Product Manager·Onsite - Product Sense / Strategy·Senior

Senior
Jul 2026

Summary

Got a product analytics question at Twitter that was framed around Amazon, which threw me off a bit. Pretty classic site performance degradation scenario but with a specific twist at the end that I didn't see coming.

Questions Asked (1)

Q1

Amazon's site performance has dropped. Walk through how you would investigate the root cause, and if you narrow it down to new non-prime visitors being disproportionately affected, what would you do next?

Root Cause AnalysisProduct Analytics & MetricsA/B Testing & Experimentation
Author's notes

The first part felt manageable.

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AI HintsAI Generated

Suggested Approach

Start by outlining a systematic root cause analysis: define the problem, gather data, form hypotheses, and test them. Then, when you narrow it down to new non-prime visitors, focus on segment-specific factors like onboarding, pricing, or UX, and propose targeted experiments to validate and fix.

Pro tip: Show that you balance data-driven investigation with customer empathy, and always tie findings back to business impact and actionable next steps.

1. Define and Scope the Problem

Clarify what 'site performance dropped' means: which metrics (e.g., page load time, conversion rate, bounce rate), when it started, and how it was detected. Establish a baseline and impact.

2. Gather and Segment Data

Pull data from monitoring tools, analytics, and logs. Segment by user type (prime vs non-prime, new vs returning), device, geography, and traffic source to identify patterns.

3. Form and Test Hypotheses

Generate hypotheses for the drop (e.g., recent code deploy, infrastructure issue, third-party script, UX change). Use A/B tests, canary releases, or correlation analysis to validate.

4. Deep Dive into Non-Prime New Visitors

If this segment is disproportionately affected, investigate their unique journey: onboarding, pricing visibility, shipping options, or personalized content. Compare their experience to prime users.

5. Prioritize and Implement Fixes

Based on findings, prioritize fixes by impact and effort. Propose experiments (e.g., UX tweaks, targeted messaging) to improve performance for this segment, and define success metrics.

Key Points to Mention

  • Use of analytics tools (e.g., Google Analytics, Mixpanel) and performance monitoring (e.g., New Relic, Datadog) to identify anomalies.
  • Segmentation by user type (prime vs non-prime, new vs returning) and other dimensions to isolate the issue.
  • Consideration of external factors (e.g., seasonality, marketing campaigns) and internal changes (e.g., code releases, infrastructure).
  • Hypothesis-driven approach with A/B testing or multivariate testing to validate root cause.
  • Focus on customer experience for new non-prime visitors: potential friction points like lack of free shipping, different pricing, or onboarding complexity.
  • Proposal of targeted solutions and metrics to measure improvement, ensuring alignment with business goals.

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