Known Interview Questions
The questions to prepare for Known interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Use window functions to compute median CTR per Meta ad campaign, excluding rows with zero or null impressions.
KnownUse PostgreSQL aggregations to produce list-like arrays and dictionary-like JSON objects from data records.
ExlParse JSON configuration text and recursively validate nested objects, arrays, and primitive types while reporting precise structural errors.
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Explain how L1 and L2 regularization differ geometrically and probabilistically, grounded in a practical supervised learning example.
KnownExplain how to test whether an observed 5% conversion rate drop is statistically significant in an experiment or before-after comparison.
KnownDesign an incrementality test for a new customer marketing campaign with explicit MDE, guardrails, power, and rollout criteria.
KnownTests KPI debugging, root-cause analysis, and distinguishing instrumentation from product changes.
KnownDefine a success metric for a new feature that captures real user value, not just raw usage.
KnownTests your backend architecture and reliability planning for Known marketing automation.
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