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Lyft·Data Scientist·Onsite - Product Sense / Strategy·Intermediate

IntermediateRejected
Jun 2026

Summary

Third round at Lyft for a Data Scientist role was a business case study, and I walked out pretty sure I'd bombed it. HR confirmed shortly after that they weren't moving me forward.

Questions Asked (1)

Q1

Prime Time pricing is stable across three consecutive weekends, then suddenly spikes in week 4. How do you investigate the root cause?

Root Cause AnalysisProduct Analytics & MetricsAdaptability & Ambiguity
Author's notes

I think I went too narrow too fast, jumped straight to demand-side stuff like a big local event and didn't structure it well before talking.

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AI HintsAI Generated

Suggested Approach

Start by validating the data and confirming the spike is real, not an artifact. Then systematically rule out internal and external factors, using a structured root cause analysis framework. Finally, quantify the impact and propose next steps.

Pro tip: Always check for data pipeline issues and metric definition changes first—they are the most common cause of sudden metric shifts. Also, consider seasonality and one-off events like holidays or promotions.

1. Validate the Data

Check data quality, pipeline health, and metric definitions to ensure the spike is not due to logging errors, missing data, or a change in how the metric is calculated.

2. Segment and Drill Down

Break down the metric by dimensions such as city, rider segment, time of day, and device type to identify where the spike is concentrated.

3. Check Internal Changes

Review recent product changes, pricing experiments, marketing campaigns, or algorithm updates that could have influenced Prime Time pricing.

4. Check External Factors

Investigate external events like weather, holidays, concerts, or competitor actions that might have increased demand or reduced supply.

5. Quantify and Conclude

Estimate the impact of each potential cause, determine the most likely root cause, and suggest monitoring or follow-up actions.

Key Points to Mention

  • Data validation: check for pipeline issues, metric definition changes, and data completeness.
  • Segmentation: analyze by city, time, rider demographics, and other relevant dimensions.
  • Internal factors: recent experiments, pricing changes, marketing campaigns, or supply/demand shifts.
  • External factors: weather, events, holidays, competitor actions, or market trends.
  • Statistical significance: ensure the spike is not due to random variation.
  • Communication: present findings clearly and recommend next steps.

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