ByteDance Data Scientist Interview Questions

1700+ verified questions, indexed by team and level. Real questions submitted by candidates who completed ByteDance loops in the last 24 months.

About the ByteDance Data Scientist hiring loop

ByteDance / TikTok interviews favour fast-paced, ML-recommendation-heavy system design. Internal ladder is 1-1 to 4-2. Coding rounds use LeetCode-style problems. Behavioural rounds emphasise ownership and ambiguity tolerance.

Data Science rounds score on statistical rigour, metric definition quality, SQL fluency, framework clarity for case studies, and communication of uncertainty. Companies weight experimental design vs ML modelling differently.

Topics covered in ByteDance Data Scientist interviews

  • 01Probability + statistics (hypothesis tests, A/B testing, p-values)
  • 02SQL fluency under time pressure
  • 03Machine learning fundamentals (bias-variance, regularisation, evaluation metrics)
  • 04Experimental design (sample size, power, interference)
  • 05Analytical case studies with metric definition
  • 06Stakeholder communication of statistical results

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