← DoorDash Interview Insights

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

Senior
Jun 2026

Summary

DoorDash PM case interview focused on a supply-side problem, specifically a drop in restaurant partners over a short window. One question, pretty open-ended, and the kind of thing that sounds manageable until you're actually in it.

Questions Asked (1)

Q1

Restaurant supply on the platform has dropped 10% over the last week. As a PM, how do you diagnose and address this?

Root Cause AnalysisProduct StrategyProduct Analytics & Metrics
Author's notes

I went straight into root cause territory, which felt right, but I think I spent too long on the diagnosis side and rushed the action plan.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the metric definition and scope of the 10% drop, then systematically segment the data to isolate the root cause. Once identified, prioritize solutions based on impact and effort, and propose a test-and-learn approach to validate fixes.

Pro tip: Demonstrate a hypothesis-driven approach by stating your top hypotheses upfront and how you'd validate them, rather than just listing data to pull. This shows you can think like a PM who prioritizes efficiently.

1. Clarify and Scope

Define 'restaurant supply' precisely (e.g., active restaurants, menu items, or inventory) and confirm the 10% drop is real and not a data anomaly. Check if the drop is global or specific to certain regions, cuisines, or restaurant tiers.

2. Segment and Hypothesize

Break down the metric by dimensions like geography, time, restaurant size, and platform changes to identify patterns. Form hypotheses for the root cause, such as seasonality, competitive actions, operational issues, or recent product changes.

3. Analyze and Validate

Use data to test each hypothesis: compare with historical trends, check for correlation with external events, and interview restaurants or support teams. Prioritize the most likely causes based on evidence.

4. Prioritize Solutions

Based on root cause, brainstorm potential fixes and evaluate them on impact, effort, and speed. Consider quick wins (e.g., fixing a bug) and longer-term strategies (e.g., new restaurant incentives).

5. Implement and Monitor

Propose a plan to implement the chosen solution, including A/B testing if applicable, and define success metrics to track recovery. Set up ongoing monitoring to prevent future drops.

Key Points to Mention

  • Metric definition and data validation to ensure the drop is accurate
  • Segmentation by dimensions like region, cuisine, restaurant size, and time
  • Hypotheses such as seasonality, competitive pressure, operational issues, or product changes
  • Root cause analysis techniques like the 5 Whys or fishbone diagram
  • Prioritization frameworks like impact/effort matrix or RICE
  • Cross-functional collaboration with analytics, ops, and restaurant partners

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