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

Senior
May 2026

Summary

PM interview at DoorDash, one question about diagnosing a drop in iOS app installs. Short and focused, but the kind of question that opens up fast if you're not careful about structure.

Questions Asked (1)

Q1

iOS app installs for DoorDash are down 35%. How do you investigate and respond?

Root Cause AnalysisProduct Analytics & MetricsProduct Strategy
Author's notes

My first instinct was to jump straight to fixes, which was the wrong move.

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AI HintsAI Generated

Suggested Approach

Start by validating the metric and ruling out data issues, then segment the decline by platform, geography, and acquisition channel to isolate the cause. Investigate internal changes (app store updates, marketing campaigns, product changes) and external factors (competitor activity, seasonality, macro trends), then prioritize fixes based on impact and effort.

Pro tip: Always check if the decline is specific to a particular acquisition channel or region first—it's often a tracking or campaign issue rather than a product problem. Also, consider that a 35% drop might be partly due to a shift in mix (e.g., fewer low-quality installs) that could actually improve long-term retention.

1. Validate the Data

Confirm the decline is real by checking data pipelines, attribution windows, and reporting definitions. Ensure there are no tracking errors or changes in how installs are counted.

2. Segment and Localize

Break down the decline by dimensions such as platform (iOS vs. Android), geography, acquisition channel, and user cohort. Identify which segments are driving the drop.

3. Identify Internal and External Factors

Review recent internal changes (app store updates, marketing campaigns, product changes) and external factors (competitor launches, seasonality, macro trends) that could impact installs.

4. Form and Test Hypotheses

Develop hypotheses for the root cause and validate them with data (e.g., A/B tests, correlation analysis). Prioritize the most likely causes based on impact and feasibility.

5. Respond and Monitor

Implement fixes or mitigations, such as reverting a change, adjusting campaigns, or improving app store presence. Set up monitoring to track recovery and prevent future issues.

Key Points to Mention

  • Check for data anomalies or tracking changes before assuming a real decline.
  • Segment by platform, geography, and acquisition channel to isolate the issue.
  • Review recent app store updates, marketing campaigns, and product changes.
  • Consider external factors like competitor activity, seasonality, and macro trends.
  • Prioritize actions based on impact and effort, and set up monitoring for recovery.
  • Communicate findings and plan with stakeholders, including engineering, marketing, and leadership.

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