Carwale Interview Questions, Process, and Tips for Freshers

There were 4 questions, CoderByte was the platform used.

1st: Hard: Array: Search GFG for "Maximum size rectangle binary sub-array with all 1s"

2nd: Medium: Search: Longest Palindrome Substring

3rd: Easy: String: Search LEET for "Largest Substring between two equal characters." There was one more condition - the substring should have unique characters.

4th: Easy: String: Given a string, of characters, If "M" is encountered, remove "M" and duplicate the last small case letter. If "N" is encountered, remove "N" and discard the next character.

Q1. This round was supposed to be based on DSA. What is Time Complexity? Give examples.
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Q2. What will be the time complexity to add an element to the Singly Linked List? Note* there are 2 types to add an element: 1st: to add at the end using Tail pointer so O(1) 2nd: to add anywhere in the middle...read more
Ans. 
Time complexity to add an element to a Singly Linked List is O(1) if added at the end using Tail pointer, and O(n) if added anywhere in the middle.
• Adding an element at the end of a Singly Linked List using the Tail pointer is a constant time operation, hence O(1).

• Adding an element anywhere in the middle of a Singly Linked List requires traversing the list to find the insertion point, resulting in a time complexity of O...read more
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Q3. Given an array of numbers, find the smallest Prime Number. I had to write down the whole code.
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Q1. This round was supposed to be System Designs. Asked me about my Web Projects. I Implemented roles. So, how did manage my DB side? How did I give access to certain roles? How to optimize my DB? If I were ...read more
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Q2. Database Designs. They asked me to draw some schema from my project, related to the above questions. Optimize it. They asked me what are Indexes. Query to be returned in O(n). So how will you do this?
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Q3. React What's the difference between using NextJs and ReactJs? Routing in NextJs. VDOM? Event Listeners. Some Hooks in NextJs.
Ans. 
NextJs is a framework built on top of ReactJs, providing server-side rendering and other features for easier development.
• NextJs is a framework built on top of ReactJs, providing server-side rendering, routing, and other features for easier development.

• ReactJs is a JavaScript library for building user interfaces, while NextJs is a framework that adds functionality like server-side rendering and routing to React applicat...read more
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Q4. JSON How to optimize JSON? Wrote a Py code to convert optimized JSON into normal JSON. An alternative method of storing JSON data in another DS
Ans. 
Optimizing JSON involves minimizing redundant data, using efficient data structures, and compressing data when necessary.
• Minimize redundant data by using references or IDs instead of repeating the same information multiple times.

• Use efficient data structures like arrays or dictionaries to store JSON data in a more organized and accessible way.

• Compress JSON data using techniques like gzip or deflate to reduce file size ...read more
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Q1. Tell me about yourself.
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Q2. Technical Qualities. Professional Qualities.
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Q3. Some negative points about it
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Q4. Personal and Family Background.
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Q5. Academic history. Achievements and Lows during Primary and Secondary school.
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Q6. Plan for Higher studies. I said Yes. It is generally said to tell NO even if you have plans. But considering my prior responses they selected me.
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Q7. Commuting to work by train?
Ans. 
Yes, I prefer commuting to work by train for its reliability and eco-friendliness.
• I find commuting by train to be more reliable than other modes of transportation, as it is not affected by traffic congestion.

• Taking the train is also more eco-friendly compared to driving a car, as it reduces carbon emissions.

• Commuting by train allows me to relax, read, or work during the journey, making it a productive use of time.
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Q1. Normal profile discussion
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SQL-medium-joins
Python-medium-dictionaries

Questions from trees and linkedin

Q1. Question on dsa and on oops
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Q2. Reverse linked list with multiple approach
Ans. 
Reverse a linked list using multiple approaches.
• Iterative approach: Use three pointers to reverse the links between nodes.

• Recursive approach: Recursively reverse the rest of the list and adjust the links.

• Stack approach: Push all the nodes onto a stack and then pop them to create the reversed list.
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Do DSA easy-medium questions from leetcode
Most of the questions were array based

Q1. Brief summary of project, technology used, challenges faced, how did u overcome that challanges
Ans. I explained my project and problem faced, then interviewed asked how did u overcome this problem
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Q2. Leetcode medium difficulty level dsa questions
Ans. 3 questions related to array and 1 was related to tree
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Q1. This was system design interview, they asked me how would u design e-commerce web app
Ans. I explained what all tables will be there, foreign key primary key etc
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Q2. Then he asked me what is load balancer
Ans. I explained what is load balancer and what is the use of it
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Q3. What is caching and why do we need to do caching
Ans. 
Caching is the process of storing frequently accessed data in a temporary storage to improve performance.
• Caching reduces the need to fetch data from the original source, improving response time.

• It helps in reducing network traffic and server load.

• Caching can be done at various levels like browser caching, CDN caching, and server-side caching.

• Examples of caching include browser caching of website assets, CDN caching of ...read more
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