New Interview Questions: April 2026
Questions added to the Dataford question bank in April 2026, ranked by how often they are asked in real interviews.
Explain how SQL fits with data analysis and visualization tools, and when to use each in an analytics workflow.
360Learning
Nationwide
UC Santa BarbaraAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
HD Supply
Benjamin MooreClean inconsistent expense records with CTEs, joins, CASE logic, and aggregation to summarize valid spend by department.
University of Colorado DenverUse joins, a CTE, and aggregations to flag invoice records with amount, date, and reference mismatches.
Valmont IndustriesDesign an ELT pipeline and warehouse data model in Snowflake for retail analytics, including dimensional modeling, orchestration, and data quality.
Circana
PDI Software
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Explain a structured debugging approach: reproduce, isolate, inspect signals, test hypotheses, and verify the fix.
Autoscience
Plaid
DaikinDefine what motivates data analysts and turn those motivations into a product strategy that improves analyst retention and product adoption.
Western Digital
Samsara
RakutenDefine the right KPI and diagnose whether stronger conversion and engagement offset weaker retention after a product launch.
Asana Spa
Zoox
VanguardInterpret what a 0.84 AUC-ROC means for a marketing response model and explain why threshold and calibration still matter.
Persistent Systems
Adentis Portugal
Bee EngineeringBuild and compare baseline and engineered-feature classifiers for consumer loan default prediction, and explain how feature engineering changes model performance.
Wonga
City National Bank of Florida
Upstart NetworkDesign a user-level A/B test and compute whether a 20,000-user 50/50 split can detect a 1.5-point conversion lift with 80% power.
Acme Micro Systems
Affirm
MUFG