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 daily.
Write a binary search function to find a target value in a sorted array.
Booking
[24]7.ai
SchonfeldCount four-directionally connected islands in a 2D grid using BFS or DFS.
Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
Meta
Spotify
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Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
CNA
Beyondmath
American Equity (AEL)Design 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.
OpenText
Fujitsu
Biz2CreditExplain how transformer self-attention works, including its role in sequence modeling and why it scales better than RNNs.
Workday
JPMorganChase
Santander Holdings USAExplain how to design and evaluate an A/B test for a product feature, including metrics, MDE, sample size, and guardrails.
PTC
Bungalow
Ipsos