Mercari Data Scientist Interview Questions

The questions to prepare for a Mercari Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

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Pitfalls in A/B Test Analysis

Medium

Tests awareness of bias, variance, and operational issues that can invalidate experiment conclusions.

Network InterferenceNovelty EffectSample Ratio Mismatch

Mercari

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Define Metrics for New Features

Medium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser value

Mercari

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Investigate 10% Transaction Drop

Hard

Tests root-cause analysis across data, traffic, and product funnels for marketplace metric declines.

KPIDiagnosis

Mercari

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Scaling Data Pipelines Effectively

Medium

Approach for building data pipelines that scale in throughput, reliability, and operational visibility.

InfrastructureETL

Mercari

Handle Imbalanced Classification Data

Medium

Build a classifier for a highly imbalanced dataset and choose metrics, sampling, and thresholds that fit the minority class.

Cross-ValidationFeature EngineeringSupervised Learning

Mercari

SQL Window Functions for WoW

Medium

Tests SQL proficiency with window functions and ability to compute segment-level trends.

Window FunctionsDate FunctionsRunning Totals

Mercari

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