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Foursquare Interview Questions

The questions to prepare for Foursquare interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~59 min
2
Coding4 questions · ~39 min
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersFoursquare
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3
Metrics4 questions · ~39 min
Using Metrics to Drive DecisionsEasy

Explain how you used a KPI and supporting metrics to diagnose a product issue and make a concrete product decision.

Funnel AnalysisKPIsLeading IndicatorsFoursquare
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4
Execution4 questions · ~39 min
Deliver Critical Project With Limited ResourcesMedium

Describe how you executed an important project under tight resource constraints, balancing scope, risks, and stakeholder expectations.

Trade-offsRisk AssessmentResource AllocationFoursquare
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5
Pipelines4 questions · ~39 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityFoursquare
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6
Machine Learning4 questions · ~39 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffFoursquare
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7
More topics26 questions · ~252 min
Approach a User Research ProjectEasy

A structured approach to planning and running a user research project that identifies user needs and drives product decisions.

User ResearchUser NeedsPain PointsFoursquare
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchFoursquare
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