Poonawalla Fincorp Data Scientist Interview Questions and Answers

Round duration - 60 Minutes
Round difficulty - Easy

Round duration - 60 Minutes
Round difficulty - Easy

There were 10 MCQs ranging from Aptitude to Programming MCQs to basics of Data Science.
The coding question only the optimized solution was accepted

Q1. 
Special Sum of Array Problem Statement
Given an array 'arr' containing single-digit integers, your task is to calculate the total sum of all its elements. However, the resulting sum must also be a single-...read more
Ans. 
Calculate the total sum of array elements until a single-digit number is obtained by repeatedly summing digits.
• Iterate through the array and calculate the sum of all elements.

• If the sum is a single-digit number, return it. Otherwise, repeat the process of summing digits until a single-digit number is obtained.

• Return the final single-digit sum.
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Round duration - 45 minutes
Round difficulty - Easy

The interview happened in the evening. It was an online video call.
The interviewer was very cooperative. I would say it was rather a discussion session between us.

Q1. 
Clone a Linked List with Random Pointers
Given a linked list where each node contains two pointers: one pointing to the next node and another random pointer that can point to any node within the list (or ...read more
Ans. 
Create a deep copy of a linked list with random pointers.
• Iterate through the original linked list and create a new node for each node in the list.

• Store the mapping of original nodes to new nodes in a hashmap to handle random pointers.

• Update the random pointers of new nodes based on the mapping stored in the hashmap.

• Return the head of the copied linked list.
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Round duration - 10 Minutes
Round difficulty - Easy

It was late night
It was a telephonic call

Q1. Metrics and related questions
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If else conditions, data merging, datetime conversions, EDA on a sample data set, duplicates removal and missing value imputation

Q1. If you have to sell a kids account, how will you Target the customer. What features will you build?
Ans. 
To target customers for a kids account, focus on features like parental controls, educational content, and interactive games.
• Implement parental controls to assure parents of child safety online.

• Include educational content to attract parents looking for learning opportunities.

• Incorporate interactive games to engage children and make the account more appealing.

• Offer rewards or incentives for completing educational activi...read more
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Q1. In depth statistics and deep learning questions.
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Q2. Machine Learning- 2 dependant and 6 independent variables are available, which algorithm we should use?
Ans. 
Use a regression algorithm like linear regression or decision tree regression.
• Consider using linear regression if the relationship between variables is linear.

• Decision tree regression can handle non-linear relationships between variables.

• Evaluate the performance of different algorithms using cross-validation.

• Consider the interpretability of the model when choosing an algorithm.
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SQL & aptitude question

1 coding question for 45 min

Q1. Detailed questing for machine learning model's.
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Python test is taken

Q1. Salary discussion
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Q1. What is cross validation ?
Ans. 
Cross validation is a technique used to assess the performance of a predictive model by splitting the data into training and testing sets multiple times.
• Cross validation helps to evaluate how well a model generalizes to new data.

• It involves splitting the data into k subsets, training the model on k-1 subsets, and testing it on the remaining subset.

• Common types of cross validation include k-fold cross validation and lea...read more
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Coding related objective questions

Q1. Basic questions based on cv. Questions based on python,SQL,ML algorithms
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