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Updated weekly · Last refresh Aug 30

Nexxen Data Scientist Interview Questions

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

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1
Machine LearningStart here. 3 questions · ~24 min
Python Stream Non-Repeating CharacterMedium

Tests ability to implement correct streaming logic and data structures in Python.

Stream ProcessingNexxen
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2
Statistics & Probability3 questions · ~24 min
Sample Size for Small LiftMedium

Tests experimental design skills for low-signal A/B tests in online advertising contexts.

MDEPower AnalysisSample SizeNexxen
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3
Behavioral & Leadership10 questions · ~80 min
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4
More topics10 questions · ~80 min
Monitor Production Model PerformanceHard

Approach for monitoring a model in production and spotting drift, threshold issues, and calibration loss.

PrecisionAccuracyRecallNexxen
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchNexxen
Design Cold Start for RecommendationsHard

Design a recommendation system strategy for model cold start and new-user cold start, including serving, evaluation, and safe rollout.

Cold StartRetrievalTwo-Tower ModelsNexxen
Parse and Aggregate Auction LogsMedium

Tests data engineering skills for log parsing and aggregation relevant to programmatic advertising.

Data Qualitylog parsingAggregationsNexxen
Floor Price Optimization for SSPHard

Tests product sense and modeling strategy for auction monetization while balancing advertiser demand.

Pricing StrategyNexxen
Diagnose Revenue Drop After DeploymentHard

Tests incident triage, monitoring interpretation, and systematic debugging of production ML impacts.

DiagnosisNexxen
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