EPAM Systems Data Scientist Interview Questions
The questions to prepare for a EPAM Systems Data Scientist interview. Questions from real interview reports rank first. Updated weekly.
Explain how bias and variance affect generalization, and how model complexity changes the balance.
EPAM SystemsDetermine sample size and power for a customer survey or experiment, including MDE, guardrails, and a disciplined decision rule.
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Use a two-proportion z-test and a 95% confidence interval to decide how to communicate a checkout A/B test result to product and executive audiences.
EPAM SystemsDesign a low latency RAG system over millions of documents, with scalable retrieval, ranking, generation, and production monitoring.
EPAM SystemsCompare batch and streaming data processing, including when each fits best in a pipeline.
EPAM SystemsTests advanced SQL window function skills for time-based metrics and cohort ranking.
EPAM SystemsCalculate daily and cumulative product revenue with CTEs, joins, date series, and window functions.
EPAM SystemsFind duplicate client contact values using a CTE, join, GROUP BY, and HAVING.
EPAM SystemsFind Platform's second-highest distinct transaction value using a join, DISTINCT, and DENSE_RANK in PostgreSQL.
Ahu TechnologiesEPAM SystemsExplain how transformer self-attention works, including its role in sequence modeling and why it scales better than RNNs.
EPAM SystemsInvestigate why a key KPI moved the wrong way after a product change and separate signal from noise.
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