Flipkart Software Development Engineer 3 Interview Questions and Answers

Find lowest common ancestor in tree

A small app was to be built using recycler view and consuming a given api.

Q1. Activity lifycycle
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Q2. Jetpack compose
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Q1. Why are you leaving the current org ?
Ans. 
Seeking new challenges and growth opportunities.
• Looking for new challenges and opportunities for growth.

• Interested in working with new technologies and tools.

• Seeking a more collaborative and innovative work environment.

• Want to expand my skill set and knowledge in a different industry.

• Current organization lacks career advancement opportunities.
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Q2. Salary expectations
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Q1. Delete nth node from end in linked list
Ans. 
To delete the nth node from the end in a linked list, we can use a two-pointer approach.
• Use two pointers, one to traverse the list and another to keep track of the nth node from the end.

• Move the second pointer n steps ahead of the first pointer.

• When the second pointer reaches the end of the list, the first pointer will be at the nth node from the end.

• Adjust the pointers to delete the nth node.
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Q2. Project discussion
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Logical and qunatative

Q1. What are Microservices
Ans. 
Microservices are a software architecture pattern where applications are built as a collection of small, loosely coupled services.
• Microservices are independent and autonomous services that communicate with each other through APIs.

• Each microservice is responsible for a specific business capability and can be developed, deployed, and scaled independently.

• Microservices promote flexibility, scalability, and resilience in s...read more
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Q1. What are SOAP APIs
Ans. 
SOAP APIs are a protocol for exchanging structured information in web services using XML-based messages.
• SOAP stands for Simple Object Access Protocol

• It is a messaging protocol that allows programs running on different operating systems to communicate with each other

• SOAP APIs use XML to format the data being sent

• They are commonly used in enterprise-level applications for integrating different systems

• SOAP APIs provide a
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Q2. What are Rest APIs?
Ans. 
REST APIs are a set of rules and protocols that allow different software applications to communicate and interact with each other over the internet.
• REST stands for Representational State Transfer

• REST APIs use HTTP methods like GET, POST, PUT, DELETE to perform operations on resources

• REST APIs are stateless, meaning each request from a client to a server contains all the necessary information

• REST APIs typically return d...read more
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Q1. Tell me about yourself?
Ans. Sure! My name ----- and i am software engineer with experience of x years.I have a strong background in web technologies.Throughout my career, I have worked on various projects, Including Ecommerce .I am passionate about problem solving and finding efficient solutions through coding. I enjoy working in collaborative environment where i can learn from my team members and contribute my skill i have learnt so far to crea...read more
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Q1. How would you handle cookies and cache in a PHP application?
Ans. 
Cookies and cache in a PHP application can be handled by setting and retrieving cookies, using caching mechanisms like memcached or Redis, and implementing cache control headers.
• Set cookies using setcookie() function in PHP

• Retrieve cookies using $_COOKIE superglobal

• Use caching mechanisms like memcached or Redis to store frequently accessed data

• Implement cache control headers to control caching behavior in the applicati
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Q2. Can you explain what redis is and how it can be used in a web application?
Ans. 
Redis is an open-source, in-memory data structure store used as a database, cache, and message broker.
• Redis is often used for caching data to improve performance in web applications.

• It can also be used as a database to store key-value pairs for fast retrieval.

• Redis can be used as a message broker for real-time applications by implementing pub/sub messaging.

• Examples: Storing session data, caching frequently accessed dat
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Q3. Can you explain how an AI recommendation system works?
Ans. 
AI recommendation systems use algorithms to analyze user data and provide personalized suggestions.
• AI recommendation systems collect and analyze user data such as browsing history, preferences, and interactions.

• They use machine learning algorithms to identify patterns and similarities between users and items.

• Based on this analysis, the system generates personalized recommendations for users, such as movies, products, o...read more
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Q1. How do you approach working in a collaboration team environment , and can you provide an example of a sucessful team collaboration?
Ans. I believe in fostering a positve and inclusive team environment.Through constant collabroration , regular feedback ansd a shared sense of ownership , we can sucessfuly deliver the feature within the given timeline.We practiced agile methodologies ,such as daily standups , sprint planning and retrospectives.This allow us to maintain a clear understanding of individual tasks and adapt our approaches as needed.
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Q2. Formal Introduction and company related information?
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Round duration - 60 minutes
Round difficulty - Medium

This round was easy for me because this round only has Basic Math, OS, Programming and English Grammar questions.
There were also two easy coding problems.

Q1. 
Prime Numbers within a Range
Given an integer N, determine and print all the prime numbers between 2 and N, inclusive.
Input:
Integer N
Output:
Prime numbers printed on separate lines
Example:
Input...read more
Ans. 
Step 1 : Run a for loop from 2 to N
Step 2 : check each number if it is prime or not
Step 3 : if prime then print
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Q2. 
Form a Triangle Problem Statement
You are given an array of integers ARR with a length of N. Your task is to determine whether it's possible to construct at least one non-degenerate triangle using the val...read more
Ans. 
Step 1 : We will Iterate through the array and pivot each element as the first side of the triangle. Let’s say we are at ‘I’ th index, So we will pivot ‘I’th index as our first side of the triangle.
 
Step 2 : And for the second side of the triangle, we will start exploring from the next index of ‘I’ and pivot each element from (I+1) till the end as the second side of the triangle. Let’s say we are at the ‘J’th inde...read more
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Round duration - 45 minutes
Round difficulty - Medium

This was interview round where one indiamart senior lead engineer was interviewer. Initially I was nervous but interviewer was very gentle so I was very comfortable at the middle of interview. Interview was based on my resume and some basic problem solving questions.

Q1. 
Remove Character from String Task
Given a string str and a character X, your task is to create a function that removes all occurrences of X from the given string.
If the character X is not found in the s...read more
Ans. 
string remove_duplicate(string str) 
{
   	int v[256];
   	for (int i = 0; i < 256; i++) {
		v[i] = 0;
	}
	string ans = "";
	for (int i = 0; i < str.length(); i++) {
		int asc = int(str[i]);
		if (v[asc] == 0) {
			ans.push_back(str[i]);
			v[asc] = 1;
		}
	}
	return ans;
}
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Coding , decoding, numerical

Q1. Asking Salary structure
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Q1. Java and oops concepts
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