Bajaj Finserv Senior Data Engineer Interview Questions and Answers

Q1. Core Java, Java 8 features, OOPS Concepts, Design Patterns used in project, Spring core, Spring Security, Spring transaction management, Spring JPA
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Q1. Project Experience, DSA related questions, scenario based questions
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CodeVue coding test, one coding questions based on regular expressions

Q1. Contract Negotiation, Previous Experiences
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Two questions were asked one ease level one moderate level, both questions were based on dsa topics. I would highly recommend to solve leetcode easy and medium questions.

Q1. Two HR type questions were asked on this platform, try to answer them as honestly as possible and keep it real.
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Q1. CFG is an nationwide hackathon in which students from various different universities are put in one team and have to make a working project within the designated time frame.
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Q1. Investment banks mostly ask multithreading questions or core concepts of java language.
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Q1. In 2nd round also, they asked java and spring related questions.
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There was one coding round that contains one average type algo and we have to write the program for that.

Q1. Explain difference between numpy array and list
Ans. 
Numpy arrays are more efficient for numerical operations compared to lists.
• Numpy arrays are homogeneous in nature, while lists can contain different data types.

• Numpy arrays support vectorized operations, making them faster for numerical computations.

• Numpy arrays require less memory compared to lists for large datasets.

• Example: np_array = np.array([1, 2, 3]) vs list = [1, 2, 3]
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Q2. Coding question: Reverse words in sentence
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Q1. Covid Case Study
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Q2. Merge two dataframe
Ans. 
Merging two dataframes combines them into a single dataframe based on a common column or index.
• Use the merge() function in pandas library in Python to merge dataframes

• Specify the common column or index to merge on

• Choose the type of join (inner, outer, left, right) based on your requirement
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Q1. Java Api debugging.
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Q2. DSA coding question with modifications
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Q1. Ai parking management system design
Ans. 
Designing an AI parking management system to optimize parking space usage and improve efficiency.
• Utilize sensors to detect available parking spaces in real-time

• Implement machine learning algorithms to predict parking demand and optimize space allocation

• Integrate with mobile apps for users to easily find and reserve parking spots

• Use computer vision for license plate recognition and enforcement of parking rules
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Q1. Behavioral questions
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Round duration - 90 Minutes
Round difficulty - Medium

Q1. 
Split Binary String Problem Statement
Chintu has a long binary string str. A binary string is a string that contains only 0 and 1. He considers a string to be 'beautiful' if and only if the number of 0's ...read more
Ans. 
The task is to split a binary string into beautiful substrings with equal number of 0's and 1's.
• Count the number of 0's and 1's in the string.

• Iterate through the string and split it into beautiful substrings whenever the count of 0's and 1's becomes equal.

• Return the maximum number of beautiful substrings that can be formed.

• If it is not possible to split the string into beautiful substrings, return -1.
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Q2. 
Merge Overlapping Intervals Problem Statement
Given a specified number of intervals, where each interval is represented by two integers denoting its boundaries, the task is to merge all overlapping interv...read more
Ans. 
Merge overlapping intervals and return sorted list of merged intervals.
• Identify overlapping intervals based on start and end times

• Merge overlapping intervals to form new intervals

• Sort the merged intervals in ascending order of start times
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Round duration - 100 Minutes
Round difficulty - Medium

It was a video interview in which 2 questions were asked u have 2 chances for each question to record your video. It was conducted on hirepro website.
 

Round duration - 35 Minutes
Round difficulty - Easy

The interviewer asked me to explain my project, 2 situation based questions and asked to solve a question on Trees

Q1. 
Left View of a Binary Tree Problem Statement
Given a binary tree, your task is to print the left view of the tree.
Example:
Input:
The input will be in level order form, with node values separated by a...read more
Ans. 
Print the left view of a binary tree given in level order form.
• Traverse the tree level by level and print the first node of each level (leftmost node).

• Use a queue to keep track of nodes at each level.

• Time complexity should be O(n) where n is the number of nodes in the tree.
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Round duration - 10 Minutes
Round difficulty - Easy

4 Programming questions
10 MCQ

Each programming question has its own time allocated.
10 mins for MCQ.

Q1. Bases on C++ multithreding
Ans. 
C++ multithreading allows for concurrent execution of multiple threads within a single program.
• Use mutexes to prevent race conditions and ensure thread safety

• Avoid deadlocks by carefully managing locks and avoiding nested locks

• Consider using condition variables to signal between threads

• Use thread pools to manage and reuse threads efficiently

• Be aware of potential performance issues and overhead with multithreading
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Q2. C++ pointers and smart pointers quetions
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Q1. C++ multithreading quetions
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Q2. Work life, achievemts.. scenario reuestions
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Q1. What are your salary expectations?
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Q2. Tell me about yourself.
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Q1. Java, Sping Boot related questions. Basic DSA questions were also asked with one pseudocode question.
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Q1. Primarily DSA questions were asked from Arrays, Collections and Trees (basic).
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Q1. HLD related questions were asked. It was a scenario based discussion with thrust on whether you can design an overall system with proper architecture tools.
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Q1. Salary discussion nothing else. HRs at JPMC would not discuss much, you might expect a random call anytime with no timeline.
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