TCS (Tata Consultancy Services) Data Scientist Interview Questions

6400+ verified questions, indexed by team and level. Real questions submitted by candidates who completed TCS (Tata Consultancy Services) loops in the last 24 months.

About the TCS (Tata Consultancy Services) Data Scientist hiring loop

TCS hires across three tracks — TCS NQT (₹3.36 LPA), TCS Ninja (₹3.36–4.5 LPA), and TCS Digital (₹9–11 LPA). Each track has different rubric weights, coding-language acceptance (C/C++/Java for Ninja; Python added for Digital), and HR-round expectations.

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 TCS (Tata Consultancy Services) 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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