Sr Data Scientist Interview Questions

3,512 sr data scientist interview questions shared by candidates

Round 1: Breadth Assessment This round evaluated the width of my knowledge across the Data Science spectrum. The structure was: Personal introduction Project walkthrough (one detailed project explanation) Technical questions spanning: Machine Learning: Data preprocessing and model evaluation Deep Learning: Optimizers and Gradient Descent Generative AI: RAG (Retrieval-Augmented Generation) and LLMs Coding problems: Printing series patterns and list/dictionary comprehension Difficulty level: Easy to moderate. Round 2: Deep Dive Technical Round This round went significantly deeper into specialized topics: Sentence transformers and their applications Benchmarking and evaluation methodologies RAG architecture and implementation Evaluation frameworks (RAGAs, DSPy) Transformer architecture fundamentals Advanced concepts: Training different word embeddings, contextual awareness, positional encoding
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Sr Data Scientist (Generative AI)

Interviewed at Fractal

4.1
Nov 3, 2025

Round 1: Breadth Assessment This round evaluated the width of my knowledge across the Data Science spectrum. The structure was: Personal introduction Project walkthrough (one detailed project explanation) Technical questions spanning: Machine Learning: Data preprocessing and model evaluation Deep Learning: Optimizers and Gradient Descent Generative AI: RAG (Retrieval-Augmented Generation) and LLMs Coding problems: Printing series patterns and list/dictionary comprehension Difficulty level: Easy to moderate. Round 2: Deep Dive Technical Round This round went significantly deeper into specialized topics: Sentence transformers and their applications Benchmarking and evaluation methodologies RAG architecture and implementation Evaluation frameworks (RAGAs, DSPy) Transformer architecture fundamentals Advanced concepts: Training different word embeddings, contextual awareness, positional encoding

HackerRank coding - 4 super lengthy question to be done in 90 mins. 1 question of sql and rest 3 on python. Technical interview: mostly project related discussions and few theoretical questions Director interview: All non-tech questions based on behavior, culture etc.
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Senior Data Scientist

Interviewed at RBC

3.9
Nov 14, 2019

HackerRank coding - 4 super lengthy question to be done in 90 mins. 1 question of sql and rest 3 on python. Technical interview: mostly project related discussions and few theoretical questions Director interview: All non-tech questions based on behavior, culture etc.

We have sales at various price points for multiple SKU's. There is lots of missing data because all SKU's are not available at all prices. There is also a time nature to the data. How do you model for the best price point to optimize profits?
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Senior Data Scientist

Interviewed at CommerceIQ

2.9
Oct 7, 2017

We have sales at various price points for multiple SKU's. There is lots of missing data because all SKU's are not available at all prices. There is also a time nature to the data. How do you model for the best price point to optimize profits?

Q: Tell us about yourself and your experience Q: Walk us through your past projects and experience. And later asked technical and non-technical questions based on the resume. Q: ML algos were asked Q: SQL questions to solve Q: Scenario bases DS questions. Which model would I choose, why and walk them through Q: Product-based scenarios were given and my inputs were asked on how I could make it better or how would I have navigated from scratch. Q: Ways to handle an unbalanced dataset
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Senior Data Scientist

Interviewed at Citizens

3.8
Jul 3, 2024

Q: Tell us about yourself and your experience Q: Walk us through your past projects and experience. And later asked technical and non-technical questions based on the resume. Q: ML algos were asked Q: SQL questions to solve Q: Scenario bases DS questions. Which model would I choose, why and walk them through Q: Product-based scenarios were given and my inputs were asked on how I could make it better or how would I have navigated from scratch. Q: Ways to handle an unbalanced dataset

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