Harnham Interview Questions
The questions to prepare for Harnham interviews, across all roles. Questions from real interview reports rank first. Updated weekly.
Implement cosine similarity for two numeric vectors using dot product and vector norms.
HarnhamUse PostgreSQL window functions to compare Harnham Recruiter Cloud's seven-day application average with the prior week.
HarnhamAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
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Benjamin MooreRank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
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Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
HarnhamDefine campaign success using business KPIs, funnel conversion, acquisition cost, and leading indicators tied to outcomes.
HarnhamIdentify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.
HarnhamExplain how you would prioritize competing engineering deadlines when stakeholders, business impact, and delivery risk are all in tension.
HarnhamCompare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.
HarnhamApproach for identifying, prioritizing, and launching a new feature that increases user engagement.
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