Info Edge Software Engineer Interview Questions, Process, and Tips

24 MCQ on Cyber Security, DSA, Linux and SQL (6 each)
2 coding questions, one medium and one hard
Duration- 94 minutes
Platform- DoSelect

Q1. Write a program to find the largest palindromic substring in the input string.
Ans. 
Program to find the largest palindromic substring in input string.
• Iterate through each character in the input string and check for palindromic substrings.

• Keep track of the largest palindromic substring found so far.

• Use dynamic programming or expand around center approach for efficient solution.

• Example: Input string 'babad', largest palindromic substring is 'bab' or 'aba'.
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Q2. Write a program to find all the elements which are present in one array but not in other array.
Ans. 
Program to find elements present in one array but not in other array
• Iterate through each element in the first array and check if it exists in the second array

• If not found, add it to a new array of unique elements

• Repeat the process for the second array to find elements unique to it
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Q3. Theoretical Questions related to DBMS, SQL, OS, OOPS
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Q1. Write a program to find all triplets with a given sum.
Ans. 
Program to find all triplets with a given sum in an array.
• Use three nested loops to iterate through all possible combinations of triplets.

• Check if the sum of the current triplet is equal to the given sum.

• Store the triplets that satisfy the condition in a list and return the list.
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Q2. Theoretical Questions related to DBMS, SQL, OOPS, OS, Computer Networks.
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Q1. Write a program to evaluate a mathematical expression (stack was involved).
Ans. 
Program to evaluate a mathematical expression using stack
• Use a stack to store operands and operators

• Iterate through the expression and push operands onto the stack

• When an operator is encountered, pop operands from the stack, perform the operation, and push the result back onto the stack

• Continue until the entire expression is evaluated

• The final result will be the top element of the stack
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Q1. What makes you feel you are satisfied in your job?
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Q2. Why do you want to join Info Edge?
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Q3. Where do you see yourself in 5 years?
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Q4. Do you have any questions regarding Info Edge?
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Q1. Intoduction your self
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Aptitude solving questions

Discussion

Q1. What are your strengths and weaknesses?
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Q2. What are your salary expectations?
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Q3. What is your family background?
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Q4. Share details of your previous job.
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Q5. Where do you see yourself in 5 years?
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Q6. Tell me about yourself.
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Arrays and Basic DSA

Q1. Linked List, Graphs
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Basic questions based on Mathematics and Simple Algebra were asked. All questions were MCQs.
For example, Work and time based questions, Solving equations-based questions.

The test was conducted on Firstnaukri.com

It was basically under the first round only. Can be said as the second part of the first round.
It had simple programming MCQs based on C, C++, Java. There were some Computer Science Fundamental questions based on DBMS, SQL, and others.

Q1. Build a pyramid pattern of numbers in O(n) time using any language.
Ans. 
Print a pyramid pattern of numbers in O(n) time.
• Use nested loops to print the pattern.

• The outer loop will iterate from 1 to n.

• The inner loop will iterate from 1 to the current value of the outer loop.

• Print the inner loop variable and a space after each iteration.

• Print a new line after the inner loop completes.
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Q2. Build a system for College Fest Management.
Ans. 
A system for managing college fests
• Create a website for event registration and ticketing

• Develop a mobile app for real-time updates and notifications

• Implement a database to store event details and participant information

• Integrate payment gateway for online transactions

• Include features for event scheduling, venue management, and volunteer coordination
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Q1. SQL question based on the second-highest salary in the employee table.
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Q2. Egg dropping problem.
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Q3. Some Ad-hoc array-based programming problems.
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Q1. NoSQL vs SQL databases
Ans. 
NoSQL databases are non-relational and flexible, while SQL databases are relational and structured.
• NoSQL databases are better suited for handling unstructured data

• SQL databases are better suited for handling structured data

• NoSQL databases are horizontally scalable

• SQL databases are vertically scalable

• Examples of NoSQL databases include MongoDB and Cassandra

• Examples of SQL databases include MySQL and PostgreSQL
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Q2. How do you decide which type of tech stack to use?
Ans. 
Tech stack selection depends on project requirements, team expertise, scalability, and budget.
• Analyze project requirements and choose a stack that fits best

• Consider team expertise and choose a stack that team is comfortable with

• Evaluate scalability requirements and choose a stack that can handle future growth

• Consider budget constraints and choose a stack that is cost-effective

• Research and compare different stacks to ma
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Q3. How would you use your Data structures and algorithms knowledge in managing the working of a server?
Ans. 
Data structures and algorithms can be used to optimize server performance and improve scalability.
• Implement efficient data structures for storing and accessing data on the server

• Use algorithms to optimize server processes and reduce response times

• Implement caching algorithms to improve performance and reduce server load

• Use data structures to manage server resources and prioritize tasks

• Implement load balancing algorithm...read more
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Q4. How would you introduce a new version of an API without breaking the previous one?
Ans. 
Introduce new API version without breaking the previous one.
• Use versioning in the API endpoint URL

• Provide documentation for both versions

• Gradually phase out the old version

• Use backward-compatible changes

• Test thoroughly before releasing the new version
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Q5. Why have you chosen NodeJS for building your projects?
Ans. 
NodeJS is fast, scalable and has a large community support.
• NodeJS is built on Chrome's V8 JavaScript engine which makes it fast and efficient.

• It is event-driven and non-blocking which makes it scalable for handling large amounts of data.

• NodeJS has a large community support with a vast number of libraries and modules available.

• It is also cross-platform compatible and can be used for both server-side and client-side deve...read more
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Q1. What is your family background?
Ans. 
My family background is diverse and multicultural.
• My parents come from different cultural backgrounds.

• I have siblings who are pursuing different careers.

• We celebrate various cultural traditions and festivals together.
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Q2. Why should we hire you?
Ans. 
You should hire me because I have a strong technical background, excellent problem-solving skills, and a passion for software development.
• I have a Bachelor's degree in Computer Science and extensive experience in software development.

• I have a deep understanding of various programming languages and frameworks, including Java, Python, and JavaScript.

• I have successfully completed several complex projects, demonstrating my...read more
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Q3. Why are you looking for a change?
Ans. 
Looking for new challenges and growth opportunities.
• Seeking a more challenging role to enhance my skills and knowledge.

• Interested in working with new technologies and staying up-to-date with industry trends.

• Want to work in a more collaborative and innovative environment.

• Desire for career advancement and professional growth.

• Seeking better work-life balance or location change.
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Q4. Tell me about yourself.
Ans. 
I am a software engineer with experience in developing and maintaining software applications.
• I have a Bachelor's degree in Computer Science.

• I have worked on various projects using different programming languages such as Java, C++, and Python.

• I am skilled in software development methodologies like Agile and have experience with version control systems like Git.

• I have strong problem-solving and analytical skills, which h...read more
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Round duration - 60 minute
Round difficulty - Easy

I was asked 3 Coding ques based on arrays , 4 SQL query based on given database, and to write a basic React code based on my resume.

Q1. 
Triplets with Given Sum Problem
Given an array or list ARR consisting of N integers, your task is to identify all distinct triplets within the array that sum up to a specified number K.
Explanation:
A t...read more
Ans. 
The task is to identify all distinct triplets within an array that sum up to a specified number.
• Iterate through the array and use nested loops to find all possible triplets.

• Check if the sum of the triplet equals the specified number.

• Print the triplet if found, else print -1.
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Round duration - 60 minutes
Round difficulty - Medium

This was a technical round where the interviewer asked me questions based on DSA, Computer Networking, Operating Systems, HTML, CSS, React and Node js.

Q1. 
Balanced Parentheses Combinations
Given an integer N representing the number of pairs of parentheses, find all the possible combinations of balanced parentheses using the given number of pairs.
Explanati...read more
Ans. 
Generate all possible combinations of balanced parentheses for a given number of pairs.
• Use recursion to generate all possible combinations of balanced parentheses.

• Keep track of the number of open and close parentheses used in each combination.

• Terminate recursion when the number of open and close parentheses used equals the given number of pairs.
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Q2. Can you explain the different OSI layers?
Ans. 
The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven distinct layers.
• Physical Layer: Deals with physical connections and transmission of raw data. Example: Ethernet cables.

• Data Link Layer: Manages data transfer between devices on the same network. Example: MAC addresses.

• Network Layer: Handles routing and forwarding o...read more
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Q3. What is the difference between a process and a thread?
Ans. 
A process is an independent entity that contains its own memory space and resources, while a thread is a lightweight sub-process that shares the same memory space and resources with other threads.
• A process has its own memory space, while threads share the same memory space within a process.

• Processes are independent entities, while threads are sub-processes that rely on the process for execution.

• Threads are lighter weig...read more
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Q4. How do you center a div using CSS?
Ans. 
To center a div using CSS, set the left and right margins to auto and specify a width for the div.
• Set margin-left and margin-right to auto

• Specify a width for the div

• Use display: block to ensure the div takes up the full width
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Q5. What is the virtual DOM in React?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM in React, used for efficient updates.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• When changes are made to the virtual DOM, React compares it with the actual DOM to identify the minimal number of updates needed.

• This process helps in optimizing performance by reducing the number of DOM manipulations.

• Example: When a user inter...read more
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Q6. Can you explain the updating phase of the React lifecycle?
Ans. 
Updating phase in React lifecycle is where the component re-renders due to changes in props or state.
• ComponentWillReceiveProps() is called before the update to compare new props with current props.

• ShouldComponentUpdate() is called to determine if the component should re-render.

• ComponentWillUpdate() is called before the re-render.

• Render() is called to update the UI with the new props or state.

• ComponentDidUpdate() is cal
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Q7. What is the Event Loop in Node.js?
Ans. 
The Event Loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.
• The Event Loop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to execute multiple operations concurrently without blocking the main thread.

• Event Loop continuously checks the event queue for new events and processes them in a loop.

• Example: When a file is being read asynchronously in Node....read more
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Round duration - 60 minutes
Round difficulty - Medium

1 coding problem and a puzzle was asked in this round.

Q1. 
Break The Integer Problem Statement
Given an integer N, the task is to divide this integer into 'K' positive parts (where K ≥ 2) such that their sum equals N. The objective is to maximize the product of t...read more
Ans. 
Given an integer N, divide it into K positive parts to maximize their product.
• Divide N into K parts such that their sum equals N

• Maximize the product of the K parts

• Constraints: 1 ≤ T ≤ 11, 2 ≤ N ≤ 55

• Example: For N = 10, parts [3, 3, 4] give product 36
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Q2. How many times in a day do the two hands on a clock coincide?
Ans. 
The two hands of a clock coincide 22 times in a day.
• The two hands of a clock coincide at 12:00, 1:05, 2:10, 3:15, 4:20, 5:25, 6:30, 7:35, 8:40, 9:45, and 10:50.

• The hands coincide once every hour, except for when they coincide at 12:00 where they coincide twice.

• The hands coincide at 12:00, 1:05, 2:10, 3:15, 4:20, 5:25, 6:30, 7:35, 8:40, 9:45, 10:50, and 11:55.
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Round duration - 30 minutes
Round difficulty - Easy

Typical HR round with behavioral problems.