ThoughtWorks Data Scientist Interview Questions
The questions to prepare for a ThoughtWorks Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Calculate patient rolling 7-day averages and rank patients within each Medpace research site using layered window functions.
Evaluates practices for correctness, testing, and monitoring of SQL in production.
Count valid daily interactions and return the top three users using aggregation and deterministic ranking.
Deduplicate customer records with ROW_NUMBER, retaining the latest record and reporting duplicate counts.
IBM
NewWave Telecom & TechnologiesAssess common A/B test pitfalls and explain how they bias interpretation before deciding whether to trust the result.
Determine A/B test sample size from baseline rate, MDE, significance level, and power, then validate the calculation through simulation.
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Define a success metric for a new feature that captures real user value, not just raw usage.
Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.
Evaluates correct use of hypothesis testing and interpretation of results.
Evaluates understanding of dimensionality reduction and when it is appropriate.