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Foundry.ai Interview Questions

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

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1
MetricsStart here. 3 questions · ~24 min
Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosisFoundry.ai
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2
A/B Testing & Experimentation3 questions · ~24 min
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 MismatchFoundry.ai
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3
System Design3 questions · ~24 min
Design a Personalized Product RecommenderHard

Design an end-to-end product recommendation system for a large e-commerce marketplace with strict latency and freshness needs.

Feature StoreFeature DriftModel ServingFoundry.ai
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4
Machine Learning7 questions · ~56 min
Bias Variance and RegularizationMedium

Explain the bias-variance tradeoff mathematically and how L1 and L2 regularization change model complexity and weights.

Bias-Variance TradeoffRegularizationSupervised LearningFoundry.ai
Handling Imbalanced Fraud LabelsMedium

Explain how to train and evaluate models on highly imbalanced fraud data without relying on misleading accuracy.

Cross-ValidationFeature EngineeringSupervised LearningFoundry.ai
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5
Product Sense4 questions · ~32 min
Churn Without Labels Retention SolutionHard

Tests your approach to weak supervision, proxy labels, and building retention models without explicit churn labels.

User NeedsRetentionsolution designFoundry.ai
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6
Statistics & Probability6 questions · ~48 min
Modeling Probability ScenariosHard

Tests your ability to translate messy probability prompts into a correct mathematical model.

probabilitymodelingFoundry.ai
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7
More topics10 questions · ~80 min
Optimizing Slow SQL JoinsMedium

Tests your SQL performance tuning skills and your ability to reason about query execution bottlenecks.

Performance TuningJoinssqlFoundry.ai
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers by Region VolumeMedium
Practice
Practice drill

Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.

Window FunctionsJoinsRankingJPMorganChaseSilicon Valley BankNavi
SQL Rolling Average and RankingHard
Practice
Practice drill

Use CTEs and window functions to calculate 7-day transaction averages and rank Loft users within each region.

Window FunctionsRankingRunning TotalsLoftArcadisCgi Nederland
Top Delayed Routes by RegionMedium
Practice
Practice drill

Use a CTE and window ranking to find the top 3 routes with the highest average delay in each region.

Window FunctionsJoinsRankingCoca-Cola ConsolidatedAPL LogisticsFlexport
The finish line: interview-readyComplete all 36 questions plus 3 hands-on drills to finish this plan.