Top 50 Applied Scientist Interview Questions
The 50 most important questions to prepare for Applied Scientist interviews. Questions from real interview reports rank first. Updated weekly.
Write a binary search function to find a target value in a sorted array.
Booking
Ingenio
Biz2CreditFind the longest substring with all unique characters using a sliding window.
Unknowns
Candescent
DropboxCompute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
Meta
Spotify
Meta ITUse ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.
Replit
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Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
CNA
BeyondmathBookingDesign a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.
Alpaca
Apex
SafaricomExplain precision, recall, F1-score, and ROC-AUC for a classification model.
FujitsuBiz2Credit
Expedia (IT)Explain how to design and evaluate an A/B test for a product feature, including metrics, MDE, sample size, and guardrails.
PTC
Bungalow
IpsosExplain how transformer self-attention works, including its role in sequence modeling and why it scales better than RNNs.
Workday
JPMorganChase
Santander Holdings USA