Citi Data Scientist Interview Questions

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

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Overfitting in High-Dimensional Ensembles

Medium

Tests your ability to apply regularization and validation strategies to control overfitting.

Ensemble MethodsRegularizationoverfitting

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Evaluate RAG Retrieval and Answers

Medium

Define metrics for retrieval quality, answer quality, and hallucination in a RAG style LLM application.

HallucinationRetrievalModel Metrics

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Vector Databases for Semantic Search

Medium

Tests your knowledge of embeddings, similarity search, and metric selection.

Language ModelsWord Embeddings

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Design an Installment-Flow Experiment

Medium

Design an A/B test for a new checkout installment-flow feature, including metrics, power, guardrails, and a disciplined ship decision.

ExperimentationHypothesis TestingA/B Testing

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SQL 7-Day Rolling Average

Medium

Tests your SQL window function skills for time-based aggregations.

Window FunctionsRunning TotalsAggregations

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