Joining multiple datasets to get to an answer
Data Scientist Senior Interview Questions
3,397 data scientist senior interview questions shared by candidates
Personal Experience questions: background and soft skills
Find the longest common prefix out of three words: For instance, parachute, party and pareto, the common prefix would be "par"
What is correlation? Logistic Regression cost function and assumptions? Entropy and Information gain ? In final rounds they ask normal behavioural questions on how will you handle conflict with peer and manager etc.
What is bias/variance tradeoff? What are some regularization techniques? Explain each one. What are some techniques to assess goodness of fit?
How do you troubleshoot if something is wrong in production?
The technical test focused on implementing a RAG (Retrieval-Augmented Generation) system for Customer Support.
I had a 45-minute technical interview with a Senior Data Scientist consultant. The session included three SQL questions and one Python question, focused on sales transactions and data manipulation. One point of friction was that the interviewer asked me not to use window functions and instead pushed for a GROUP BY solution. While I adapted under pressure, I felt the conversation was more rigid than collaborative. Overall, the process was structured and timely, but I would have appreciated more flexibility in the problem-solving approach — especially for senior-level candidates who may use different methods to arrive at the correct solution.
1. End to end data design task including classification and anomaly detection. Focus was heavily oriented towards metric specification and detecting anomalies. 2. 5 values based questions, including one about colleague trust, another about weighing up costs when designing a data pipeline, and another about stakeholder engagement.
1st round: medium level data manipulation, wrangling 2nd round: probability, maths based coding, complex algorithm questions. 3rd round: Extremely vague system design. I was given computer vision based system design which I did 5 years back.
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