Top 25
Prep plan
Updated weekly · Last refresh Aug 30

Datadog Applied Scientist Interview Questions

The questions to prepare for a Datadog Applied Scientist interview. Questions from real interview reports rank first. Updated weekly.

25questions
~3htotal time
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1
CodingStart here. 6 questions · ~48 min
Moving Average with Sliding WindowMedium

Tests proficiency implementing windowed computations efficiently and correctly.

MetricsSliding WindowDatadog
Search Under Time Complexity ConstraintHard

Tests algorithmic thinking and ability to meet strict performance requirements.

time complexityoptimizationDatadog
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2
System Design6 questions · ~48 min
Design an LLM Serving PlatformHard

Design an LLM serving system that balances latency, cost, scalability, and safety for production traffic.

Cold StartFeature StoreModel ServingDatadog
Feature Engineering from Raw LogsMedium

Tests ability to transform raw logs into model-ready features for downstream ML tasks.

Feature EngineeringprocessDatadog
Retrain on Data Drift PipelineHard

Tests design of robust ML monitoring, drift detection, retraining workflows, and operational safety.

data driftDatadog
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3
Machine Learning6 questions · ~48 min
Unsupervised Model EvaluationMedium

Tests ability to define evaluation strategies and metrics for unsupervised models in real systems.

Unsupervised LearningModel EvaluationproductionDatadog
Imbalanced Data for Anomaly DetectionMedium

Tests strategies for learning from rare events and maintaining detection quality under imbalance.

data handlinganomaly detectionDatadog
Dimensionality Reduction Trade-offsMedium

Tests understanding of when dimensionality reduction helps and the costs in information and performance.

Trade-offsDatadog
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4
Behavioral & Leadership7 questions · ~57 min
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The finish line: interview-readyComplete all 25 questions to finish this plan.