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Nielsen Data Scientist Interview Questions, Process, and Tips

Updated 7 Jan 2025

Top Nielsen Data Scientist Interview Questions and Answers

  • Q1. Write pandas query to separate the names as first and last name from the full name. Drop the duplicate columns and also the missing values. Write output for the Python co ...read more
  • Q2. Make 2 lists a=[1,2,3,4] b=[9,8,5,5,2,3,3,4,1,1,10,9,2,3,4,10,10,9,7,7,8] Write a program to remove duplicate of b and keep only those elements of b which are not present ...read more
  • Q3. SQL question Remove duplicate from a table tab1

Nielsen Data Scientist Interview Experiences

4 interviews found

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.

Round 1 - Technical 

(2 Questions)

  • Q1. Explain any ML model.
  • Ans. 

    Random Forest is an ensemble learning method that builds multiple decision trees and merges them together to get a more accurate and stable prediction.

    • Random Forest is a popular machine learning model used for classification and regression tasks.

    • It works by creating multiple decision trees during training and outputs the mode of the classes for classification or the average prediction for regression.

    • Random Forest is ro...

  • Answered by AI
  • Q2. Create Dataframe from two lists.
  • Ans. 

    Creating a DataFrame from two lists in Python.

    • Import the pandas library

    • Create two lists of data

    • Use pd.DataFrame() to create a DataFrame from the two lists

  • Answered by AI

Interview Preparation Tips

Topics to prepare for Nielsen Data Scientist interview:
  • Python
  • pandas
  • ML
Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Referral and was interviewed in May 2024. There were 3 interview rounds.

Round 1 - Coding Test 

I was asked to write SQL queries for 3rd highest salary of the employee, some name filtering, group by tasks.
Python code to find the index of the maximum number without using numpy.

Round 2 - One-on-one 

(1 Question)

  • Q1. Explain the Project undertaken during the research and follow-up questions
Round 3 - Technical 

(1 Question)

  • Q1. Write pandas query to separate the names as first and last name from the full name. Drop the duplicate columns and also the missing values. Write output for the Python code. Write SQL query to retrieve t...
  • Ans. 

    Answering questions related to data science concepts and techniques.

    • Recall is the ratio of correctly predicted positive observations to the total actual positives. Precision is the ratio of correctly predicted positive observations to the total predicted positives.

    • To reduce variance in an ensemble model, techniques like bagging, boosting, and stacking can be used. Bagging involves training multiple models on different ...

  • Answered by AI

Interview Preparation Tips

Topics to prepare for Nielsen Data Scientist interview:
  • Python
  • Pandas
  • SQL
  • Machine Learning
Interview preparation tips for other job seekers - Have your basics strong.

Skills evaluated in this interview

Data Scientist Interview Questions Asked at Other Companies

Q1. for a data with 1000 samples and 700 dimensions, how would you fi ... read more
Q2. Special Sum of Array Problem Statement Given an array 'arr' conta ... read more
asked in Affine
Q3. you have a pandas dataframe with three columns, filled with state ... read more
Q4. Clone a Linked List with Random Pointers Given a linked list wher ... read more
asked in Coforge
Q5. coding question of finding index of 2 nos. having total equal to ... read more
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
6-8 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed in Oct 2023. There were 4 interview rounds.

Round 1 - Coding Test 

Sql, python, Statistics mcq, Aptitude test. These were medium level questions.

Round 2 - Technical 

(3 Questions)

  • Q1. SQL and python, time complexity
  • Q2. Make 2 lists a=[1,2,3,4] b=[9,8,5,5,2,3,3,4,1,1,10,9,2,3,4,10,10,9,7,7,8] Write a program to remove duplicate of b and keep only those elements of b which are not present in a, and the final list should ...
  • Ans. 

    Remove duplicates from list b, keep elements not in list a, and sort in ascending order.

    • Create a set from list b to remove duplicates

    • Use list comprehension to keep elements not in list a

    • Sort the final list in ascending order

  • Answered by AI
  • Q3. SQL question Remove duplicate from a table tab1
  • Ans. 

    Use the DISTINCT keyword in SQL to remove duplicates from a table.

    • Use the SELECT DISTINCT statement to retrieve unique rows from the table.

    • Identify the columns that should be used to determine uniqueness.

    • Example: SELECT DISTINCT column1, column2 FROM tab1;

  • Answered by AI
Round 3 - Case Study 

Given 2 case studies on data science and asked different possibilities to improve the models.

How to work with imbalance dataset.
How to remove null values, what is features engineering.
What is PCA
What is the working of XGBOOST

Round 4 - Project discussion 

(1 Question)

  • Q1. What was last project, tell me in detail. There were different technical questions related to my project

Interview Preparation Tips

Interview preparation tips for other job seekers - Be confident and practice SQL, python, mainly pandas and numpy. Should have good knowledge on time complexity.


All the metrics of evaluating a model.
Linear regression, logestic regression, random forest, decission tree, adaboost, Gradient boosting, XGb in detail.

Recall, precision roc_curve. Auc, f1 score, mse,mae, r2, adjusted r2 score.

Is it possible that r2 score appears in minus

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
4-6 weeks
Result
Selected Selected

I applied via Referral and was interviewed in Mar 2024. There were 4 interview rounds.

Round 1 - Aptitude Test 

Test consisted 7 sections which lasted for more than a hour. There were questions related to coding , sql , analytical questions etc.

Round 2 - Coding Test 

1 python coding questions and 2 Sql question

Round 3 - Case Study 

2 case study question

Round 4 - HR 

(1 Question)

  • Q1. This was the final round . Technical+HR .

Interview Preparation Tips

Interview preparation tips for other job seekers - All the best. Interview process is too long , have patience. And be prepared , questions will be basic.

Nielsen interview questions for designations

 Senior Data Scientist

 (2)

 Executive Data Scientist

 (1)

 Data Engineer

 (5)

 Data Analyst

 (3)

 Senior Data Engineer

 (2)

 Data Processing Executive

 (1)

 Lead Data Engineer

 (1)

 Data Processing Specialist

 (1)

Interview questions from similar companies

Interview Questionnaire 

1 Question

  • Q1. Was asked to explain one of my work projects in detail, Basic pandas syntax
Interview experience
3
Average
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Approached by Company and was interviewed before Mar 2023. There was 1 interview round.

Round 1 - One-on-one 

(2 Questions)

  • Q1. Past projects of machine learning
  • Ans. 

    Developed a predictive model for customer churn using machine learning algorithms.

    • Used Python and scikit-learn library for data preprocessing and model building

    • Performed feature engineering to improve model performance

    • Evaluated model performance using metrics like accuracy, precision, and recall

  • Answered by AI
  • Q2. Distributed computing and spark questions

Skills evaluated in this interview

Interview experience
1
Bad
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Aptitude Test 

DSA and ML, AI, Coding question

Round 2 - One-on-one 

(1 Question)

  • Q1. Case study which was easy
Round 3 - One-on-one 

(1 Question)

  • Q1. In depth questions on ML
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in Oct 2023. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Coding Test 

2hrs - sections include aptitude, machine learning, deep learning and two easy python coding questions

Round 3 - One-on-one 

(4 Questions)

  • Q1. Resume scrutiny with projects and internships
  • Q2. How to measure 45 mins duration using two identical wires
  • Q3. Partition a round cake into eight equal parts within three cuts
  • Q4. 10 coins puzzle (5 heads up and 5 tails up)

Interview Preparation Tips

Interview preparation tips for other job seekers - Thorough revision on deep learning and be clear on your internships such as workflow, why did you opted a specific component (such as tool, algorithm...etc).They test you on the basis of your resume explanation, so be honest don't try to fake some
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-

I was interviewed in Nov 2024.

Round 1 - Technical 

(2 Questions)

  • Q1. Project related questions
  • Q2. Coding questions
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Not Selected

I applied via Company Website and was interviewed in Jun 2024. There were 2 interview rounds.

Round 1 - Aptitude Test 

Basic aptitude , tech aptitude

Round 2 - One-on-one 

(2 Questions)

  • Q1. What is overfitting
  • Q2. How to handle missing values
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Nielsen Interview FAQs

How many rounds are there in Nielsen Data Scientist interview?
Nielsen interview process usually has 3 rounds. The most common rounds in the Nielsen interview process are Coding Test, Technical and Case Study.
How to prepare for Nielsen Data Scientist interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at Nielsen. The most common topics and skills that interviewers at Nielsen expect are Django, Docker, Numpy, Pandas and Pyspark.
What are the top questions asked in Nielsen Data Scientist interview?

Some of the top questions asked at the Nielsen Data Scientist interview -

  1. Write pandas query to separate the names as first and last name from the full n...read more
  2. Make 2 lists a=[1,2,3,4] b=[9,8,5,5,2,3,3,4,1,1,10,9,2,3,4,10,10,9,7,7,8] Wri...read more
  3. SQL question Remove duplicate from a table t...read more

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Nielsen Data Scientist Interview Process

based on 4 interviews

Interview experience

4
  
Good
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Nielsen Data Scientist Salary
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₹6 L/yr - ₹18.5 L/yr
21% less than the average Data Scientist Salary in India
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