Veltris Lead Data Scientist Interview Questions and Answers

Q1. Tell me about 1 project you have worked on and what did you learn during this?
Ans. 
Developed a machine learning model to predict customer churn for a telecom company.
• Collected and cleaned customer data including demographics, usage patterns, and customer service interactions.

• Used various machine learning algorithms such as logistic regression, random forest, and XGBoost to build and evaluate the model.

• Identified key factors contributing to customer churn such as contract length, monthly charges, and ...read more
Answered by AI
Add your answer
Q2. How do you build a recommendation system?
Ans. 
A recommendation system can be built using collaborative filtering, content-based filtering, or hybrid approaches.
• Collect and preprocess data on user preferences and item attributes

• Implement collaborative filtering by recommending items based on user behavior and preferences

• Utilize content-based filtering by recommending items similar to those previously liked by the user

• Consider hybrid approaches that combine collabor...read more
Answered by AI
Add your answer

Q1. Rating compliment the process
Add your answer

Basic aptitude question

Q1. Basic analysis and ML questions , more focused on approach instead of coding
Add your answer

Q1. As like other HR rounds
Add your answer

Quantitative Analysis , Reasoning and verbal

Q1. SQL , Python , Machine Learning (prefered)
Add your answer

Q1. Basic HR questions asked available on internet
Add your answer

Q1. Reverse a string in list
Ans. 
Reverse a string in a list of strings
• Iterate through each string in the list

• Use the built-in function to reverse each string

• Store the reversed strings in a new list
Answered by AI
Add your answer
Q2. Explain joins in sql
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
Answered by AI
Add your answer

Q1. Proficiency in cloud technology
Ans. 
Proficiency in cloud technology is essential for data scientists to efficiently store, manage, and analyze large datasets.
• Experience with cloud platforms like AWS, Azure, or Google Cloud

• Knowledge of cloud storage solutions like S3, Blob Storage, or Cloud Storage

• Understanding of cloud computing concepts like virtual machines, containers, and serverless computing

• Ability to work with big data technologies like Hadoop, Spa
Answered by AI
Add your answer

Sql and basis python

Business related case study

Q1. Previous Project discussion
Add your answer