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ByteDance Interview Questions

The questions to prepare for ByteDance interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 5 questions · ~53 min
2
SQL & Data Manipulation4 questions · ~42 min
Second Highest Without AggregatesMedium
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsByteDance
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3
Machine Learning4 questions · ~42 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffByteDance
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4
Product Sense4 questions · ~42 min
Approach a User Research ProjectEasy

A structured approach to planning and running a user research project that identifies user needs and drives product decisions.

User ResearchUser NeedsPain PointsByteDance
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5
System Design4 questions · ~42 min
Design a Personalized Recommendation RankerHard

Design a personalized recommendation system that turns user preferences into ranked suggestions with retrieval, ranking, and feedback loops.

RetrievalTwo-Tower ModelsRecommendation SystemsByteDance
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6
Model Evaluation4 questions · ~42 min
Model Performance EvaluationEasy

Tests your ability to select metrics, validation strategy, and interpret results for ML models.

PrecisionAccuracyRecallByteDance
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7
More topics25 questions · ~263 min
Explain Transformer Architecture BasicsEasy

Explain the transformer architecture and why it became a core building block for modern NLP systems.

Neural NetworksLanguage ModelsDeep LearningByteDance
Define Success Metrics for FeaturesMedium

Set a clear north star, supporting KPIs, leading indicators, and guardrails for a new product feature.

North Star MetricLagging IndicatorsKPIsByteDance
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