phData Interview Questions
The questions to prepare for phData interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Reverse a string using basic iteration and swapping, without built-in reverse helpers.
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Approach for maintaining data quality and integrity across ETL pipelines.
phDataExplain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
phDataDescribe an embedded project challenge, how you mitigated risk, managed stakeholders, and made trade-offs to deliver.
phDataDesign a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.
phDataInvestigate why a key KPI moved the wrong way after a product change and separate signal from noise.
phDataDesign an end-to-end product recommendation system for a large e-commerce marketplace with strict latency and freshness needs.
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