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Updated weekly · Last refresh Oct 17

Decagon Research Engineer Interview Questions

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

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1
Machine LearningStart here. 3 questions · ~24 min
PEFT vs Full Fine-Tuning Trade-offsHard

Compare LoRA and full fine-tuning for adapting Llama to Decagon's highly structured task outputs.

model selectionmodel architectureRegularizationDecagon
Preventing Catastrophic ForgettingHard

Design a fine-tuning strategy that improves narrow-domain performance while preserving the LLM's general capabilities.

RegularizationDeep Learningmodel fine-tuningDecagon
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2
System Design6 questions · ~48 min
Hybrid Search for Recall and PrecisionHard

Design Decagon's hybrid keyword and vector retrieval system for high recall, precision, freshness, and reliable online serving.

ML RankingRetrievalinference latencyDecagon
Scalable Serving for Traffic SpikesHard

Design Decagon’s ML serving architecture to remain reliable and low-latency during sudden traffic spikes.

distributed trainingFeature Storedistributed systemsDecagon
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3
Behavioral & Leadership3 questions · ~24 min
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4
More topics5 questions · ~40 min
Dataset Curation for Instruction TuningHard

Design a reliable pipeline to curate, filter, validate, and version specialized Decagon customer support data for instruction tuning.

Data Qualitydata integrationdata pipelineDecagon
Minimizing Retrieval Latency OverheadHard

Design a production evaluation framework for measuring and reducing retrieval latency overhead at Decagon.

Evaluation Techniqueslatencyperformance metricsDecagon
Chunking and Metadata OptimizationMedium

Tests your ability to improve retrieval quality through document preprocessing choices.

Text ClassificationNLPTokenizationDecagon
Debugging Silent ML Quality DegradationHard

Diagnose degraded model outputs without exceptions by tracing data quality, feature freshness, distribution drift, and evaluation gaps.

Data Qualitymonitoringdata pipelinesDecagon
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