CARS24 Senior Java Developer Interview Questions and Answers

Basic coding only not to worry much

Q1. Tell me about ur self
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Excellent team player with good communication skills
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Q2. What is ur projects
Ans. 
I have worked on various projects including a web-based inventory management system and a mobile app for tracking fitness goals.
• Developed a web-based inventory management system using React and Node.js

• Created a mobile app for tracking fitness goals using Flutter

• Implemented RESTful APIs for communication between frontend and backend systems
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Sorting of an array and aptitude

Q1. BFS graph traversal
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Q1. Binary tree question
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Round duration - 120 minutes
Round difficulty - Medium

Round duration - 120 minutes
Round difficulty - Medium

- Discussion on the first round's assignment
- Was asked about adding unit tests in the assignment
- Fundamental questions on the approach used for the assignment.

Q1. What are some things that could have been done better in the system design problem given in the first round?
Ans. 
Some improvements in the system design problem could include better scalability planning, more efficient data storage solutions, and improved error handling.
• Implementing a more robust caching mechanism to improve performance under heavy load.

• Optimizing the database schema for better query performance and scalability.

• Introducing load balancing and horizontal scaling to handle increased traffic.

• Enhancing error handling t...read more
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Round duration - 90 minutes
Round difficulty - Medium

Round was with tech lead. Was briefly asked about the problem I solved in the first round. Then I was asked to solve 1 medium level DSA based question. Some discussion on culture fit was also done.

Q1. Given the frequency of traffic lights' states, can you determine if there will ever be an invalid state for the traffic signal, and what are the conditions that lead to an invalid state?
Ans. 
Yes, an invalid state can occur if the traffic lights are in conflicting states simultaneously.
• An invalid state occurs when multiple traffic lights are showing conflicting signals, such as both red and green at the same time.

• This can happen due to a malfunction in the traffic light system or human error in programming the lights.

• For example, if a traffic light is stuck showing both red and green signals, it would be co
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Q1. Explain Deadlock?
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Q2. Explain Red Black Tree?
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Q3. Find local minima in a 1-D array?
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Q4. Find local minima in 2-D array?
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The exam duration is one and a half hours.

The total exam time is one and a half hours.

It encompasses all topics related to full stack development.

Q1. Asks questions on SQL
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Q2. Asks question in typical topics
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Q1. Where do you see yourself in two years?
Ans. 
In two years, I see myself as a senior software developer leading a team on innovative projects.
• Advancing to a senior software developer role

• Leading a team on new and innovative projects

• Continuing to enhance my technical skills through ongoing learning and training
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Majorily on SQL and Databases

Q1. Align two images in a page with same width and same height
Ans. 
Use CSS to align two images with same width and height on a page
• Set both images to have the same width and height using CSS

• Use flexbox or grid layout to align the images horizontally or vertically

• Adjust margins or padding to fine-tune the alignment
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Q2. Array related question
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Q1. Situation based question
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Q2. Majorily focused on project
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Duration 1Hr
2 coding questions

Q1. Don't remember the questions
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Q2. Don't remember the questions.
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Q1. Code postorder traversal without using recursion.
Ans. 
Iterative solution using a stack to perform postorder traversal.
• Use a stack to simulate the recursive call stack.

• Push nodes in the order of right, left, root.

• Pop nodes from stack and add to result array.

• Repeat until stack is empty.
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Q2. Leetcode Problem 1626 - Best team with no conflicts.
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Q1. Design whatsapp with one to one, group messaging and read receipts functionalities. Design the database.
Ans. 
Design a messaging app like WhatsApp with one-to-one, group messaging, and read receipts functionalities.
• Use a relational database to store user information, messages, and group memberships.

• Create tables for users, messages, groups, and group memberships.

• Include columns for message content, sender, receiver, timestamp, and read status.

• Implement a feature to mark messages as read with read receipts.

• Use indexes for effic
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Q2. Questions on dbms, cn and os.
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