Top 17
Prep plan
Updated weekly · Last refresh Sep 24

Decagon Research Scientist Interview Questions

The questions to prepare for a Decagon Research Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 3 questions · ~27 min
Calculate Classification AccuracyEasy
Practice

Implement a function that computes classification accuracy by comparing predicted labels with true labels.

MathArraysStringsDecagon
Real-Time AI Data PipelineMedium

Tests your ability to design streaming or near-real-time data pipelines for AI applications.

Hash TablesQueueArraysDecagon
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2
Machine Learning4 questions · ~36 min
Supervised vs Unsupervised LearningEasy

Explain how supervised, unsupervised, and reinforcement learning differ in data, objectives, and evaluation.

Unsupervised LearningFeature EngineeringSupervised LearningDecagon
Data Preprocessing for Reliable ModelsEasy

Explain why data preprocessing matters, using a concrete supervised learning example with missing values, outliers, and mixed feature types.

Cross-ValidationFeature EngineeringSupervised LearningDecagon
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3
System Design3 questions · ~27 min
Multi-Modal AI ArchitectureHard

Tests your ability to design end-to-end multi-modal AI systems for production use at Decagon.

Feature StoreRetrievalModel ServingDecagon
Deploying AI at ScaleHard

Tests your knowledge of production deployment concerns like latency, reliability, monitoring, and cost at Decagon.

Feature StoreFeature DriftModel ServingDecagon
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4
Behavioral & Leadership5 questions · ~46 min
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5
More topics2 questions · ~18 min
Approach LLM Fine-Tuning for TasksMedium

Explain a practical approach to fine-tuning an LLM for a specific task, including data, evaluation, and hallucination risks.

Prompt EngineeringLLM EvaluationFine-TuningDecagon
Handling Sudden Performance DegradationMedium

Tests your ability to diagnose model failures, detect drift, and execute mitigation steps.

PrecisionAccuracyRecallDecagon
The finish line: interview-readyComplete all 17 questions to finish this plan.