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.
Aggregate January 2024 campaign data by channel using GROUP BY, filtering, and ordering by total clicks.
PENFED Credit Union
DNV
NetflixImplement binary search to find a target in a sorted array in O(log n) time.
Wayfair
Syapse
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Design an ELT pipeline and warehouse data model in Snowflake for retail analytics, including dimensional modeling, orchestration, and data quality.
Adentis Portugal
KeyLogic
RocketDefine what motivates data analysts and turn those motivations into a product strategy that improves analyst retention and product adoption.
ABC Education
Rakuten
Syneos HealthDefine 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 SystemsAdentis 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
EquifaxDesign 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