Top 27
Prep plan
Updated weekly · Last refresh Aug 30

Foursquare Machine Learning Engineer Interview Questions

The questions to prepare for a Foursquare Machine Learning Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 4 questions · ~35 min
Implement Gradient DescentEasy
Practice

Implement batch gradient descent to fit a one-feature linear model for Plymouth Rock Assurance claim severity estimates.

MathArraysGradient DescentFoursquare
Time Complexity of Sorting AlgorithmsEasy

Compare common sorting algorithms by best, average, and worst-case time complexity and explain when each is appropriate.

MathArraysSortingFoursquare
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2
Model Evaluation5 questions · ~44 min
Build Reliable Model EvaluationMedium

Approach for evaluating models so performance is stable, well calibrated, and fit for production scale.

Cross-ValidationCalibrationPrecisionFoursquare
Optimize an Underperforming ModelHard

Structured approach for improving an underperforming model through validation, tuning, threshold selection, and bias variance diagnosis.

Hyperparameter TuningCross-ValidationBias-Variance TradeoffFoursquare
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3
Machine Learning5 questions · ~44 min
Handling Missing Values in MLEasy

Explain practical strategies for handling missing values in a supervised learning workflow, from diagnosis to modeling and validation.

Cross-ValidationFeature EngineeringRegularizationFoursquare
Handle Imbalanced Classification DataMedium

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

Cross-ValidationFeature EngineeringSupervised LearningFoursquare
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4
System Design4 questions · ~35 min
Deploy a Cloud ML Inference SystemMedium

Design a cloud ML deployment system for a security product, covering training, serving, updates, and production monitoring.

InfrastructureFeature DriftModel ServingFoursquare
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5
Behavioral & Leadership7 questions · ~61 min
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6
More topics2 questions · ~17 min
Machine Learning Pipeline ArchitectureMedium

Tests your ability to design end-to-end ML pipelines with data, training, evaluation, and deployment considerations.

ETLBatch ProcessingOrchestrationFoursquare
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The finish line: interview-readyComplete all 27 questions to finish this plan.