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PayPal Full Stack Developer Interview Questions and Answers
6 Interview questions
Vertical Order Traversal Problem Statement
You are given a binary tree, and the task is to perform a vertical order traversal of the values of the nodes in the tree.
For a node at position ('X', 'Y'), the...
Perform vertical order traversal of a binary tree based on decreasing 'Y' coordinates.
Traverse the binary tree level by level and maintain the position of each node
Use a map to store nodes at each position and sort them based on 'Y' coordinates
Print the nodes in sorted order for each position to get the vertical order traversal
N Queens Problem
Given an integer N, find all possible placements of N queens on an N x N chessboard such that no two queens threaten each other.
Explanation:
A queen can attack another queen if they are...
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard where no two queens threaten each other.
Use backtracking algorithm to explore all possible configurations.
Keep track of rows, columns, and diagonals to ensure queens do not threaten each other.
Generate valid configurations recursively and backtrack when a solution is not possible.
Divide Two Integers Problem Statement
You are given two integers dividend and divisor. Your task is to divide the integers without using multiplication, division, and modular operators. Return the quotient...
Divide two integers without using multiplication, division, and modular operators, returning the floored value of the quotient.
Implement division using bit manipulation and subtraction
Handle edge cases like negative numbers and overflow
Return the floored value of the quotient
Rearrange String Problem Statement
Given a string ‘S’, your task is to rearrange its characters so that no two adjacent characters are the same. If it's possible, return any such arrangement, otherwise ret...
Given a string, rearrange its characters so that no two adjacent characters are the same. Return 'Yes' if possible, 'No' otherwise.
Iterate through the string and count the frequency of each character
Use a priority queue to rearrange characters based on frequency
Check if the rearranged string has no two adjacent characters the same
Return 'Yes' if possible, 'No' otherwise
What people are saying about PayPal
Friends Pairing Problem
The task is to determine the total number of ways to pair up 'N' friends or leave some of them single, following these rules:
- Each friend can either pair with one other friend o...
The task is to determine the total number of ways to pair up 'N' friends or leave some of them single.
Use dynamic programming to solve the problem efficiently.
Consider the base cases when N is 1, 2, and 3 to derive the general formula.
The result should be computed modulo 10^9 + 7 to handle large outputs.
Group Anagrams Together
Given an array/list of strings STR_LIST, group the anagrams together and return each group as a list of strings. Each group must contain strings that are anagrams of each other.
Ex...
Group anagrams in a list of strings together and return each group as a list of strings.
Iterate through the list of strings and sort each string alphabetically to create a key for grouping.
Use a hashmap to store the sorted string as key and the original string as value.
Return the values of the hashmap as the grouped anagrams.
PayPal HR Interview Questions
PayPal Full Stack Developer Interview Experiences
2 interviews found
Anonymous
(1 Question)
- Q1. System design interview
I appeared for an interview in Jul 2021.
(2 Questions)
Round duration - 120 Minutes
Round difficulty - Medium
This was a coding round conducted from 12 PM to 2 PM and it was not proctored but we could not switch the tabs. There were 2 coding questions each of 100 marks. The MCQ had HTML,CSS, JS, SQL, Coding and aptitutude questions.
- Q1.
N Queens Problem
Given an integer
N, find all possible placements ofNqueens on anN x Nchessboard such that no two queens threaten each other.Explanation:
A queen can attack another queen if they ar...
- Q2.
Rearrange String Problem Statement
Given a string ‘S’, your task is to rearrange its characters so that no two adjacent characters are the same. If it's possible, return any such arrangement, otherwise re...
- Ans.
Given a string, rearrange its characters so that no two adjacent characters are the same. Return 'Yes' if possible, 'No' otherwise.
Iterate through the string and count the frequency of each character
Use a priority queue to rearrange characters based on frequency
Check if the rearranged string has no two adjacent characters the same
Return 'Yes' if possible, 'No' otherwise
(2 Questions)
Round duration - 60 minutes
Round difficulty - Easy
There were two interviewers. They started by asking me to introduce myself and asked me to explain any one of my projects in my resume and after that, they asked me about the ML algorithms used in my project and about the difficulties faced. What is NaN property in JavaScript? This took around 10 minutes. They also asked 2 coding questions.
It was conducted at 10 AM on CodePair and MS Teams. Interviewers were friendly.
- Q1.
Group Anagrams Together
Given an array/list of strings
STR_LIST, group the anagrams together and return each group as a list of strings. Each group must contain strings that are anagrams of each other.E...
- Q2.
Friends Pairing Problem
The task is to determine the total number of ways to pair up 'N' friends or leave some of them single, following these rules:
- Each friend can either pair with one other friend ...
- Ans.
The task is to determine the total number of ways to pair up 'N' friends or leave some of them single.
Use dynamic programming to solve the problem efficiently.
Consider the base cases when N is 1, 2, and 3 to derive the general formula.
The result should be computed modulo 10^9 + 7 to handle large outputs.
(2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
There were 2 questions based on data structures, the round started from 1.15 PM .Some SQL questions like What is a Subquery? What are its types? What are UNION, MINUS and INTERSECT commands?
- Q1.
Vertical Order Traversal Problem Statement
You are given a binary tree, and the task is to perform a vertical order traversal of the values of the nodes in the tree.
For a node at position ('X', 'Y'), th...
- Ans.
Perform vertical order traversal of a binary tree based on decreasing 'Y' coordinates.
Traverse the binary tree level by level and maintain the position of each node
Use a map to store nodes at each position and sort them based on 'Y' coordinates
Print the nodes in sorted order for each position to get the vertical order traversal
- Q2.
Divide Two Integers Problem Statement
You are given two integers
dividendanddivisor. Your task is to divide the integers without using multiplication, division, and modular operators. Return the quotien... - Ans.
Divide two integers without using multiplication, division, and modular operators, returning the floored value of the quotient.
Implement division using bit manipulation and subtraction
Handle edge cases like negative numbers and overflow
Return the floored value of the quotient
(1 Question)
Round duration - 30 Minutes
Round difficulty - Easy
The round was at 7.30 PM and I was asked to introduce myself and we had basic talk on where I live and my interests. I asked about the work culture and about the role at the end.
- Q1. You are presented with a puzzle where there are n balloons, and your task is to burst the maximum number of balloons using an arrow. How would you approach solving this puzzle?
Interview Preparation Tips
Tip 1 : Practice atleast 400 questions of leetcode topics wise.
Tip 2 : Participate in hackathons.
Tip 3 : Have 2 good projects atleast and be very good in project concepts.
Tip 1 : Have good projects in your resume and have clear idea of what you have done in those.
Tip 2 : Mention languages, frameworks, subjects only when you have proper hold on them, don't mention things you don't know properly.
Skills evaluated in this interview
Interview questions from similar companies
I appeared for an interview in Dec 2020.
(1 Question)
Round duration - 60 minutes
Round difficulty - Medium
test timing: 7-8 pm
2 programming questions
webcam proctored
- Q1.
Minimum Cost to Reach End Problem
You are provided with an array
ARRof integers of size 'N' and an integer 'K'. The goal is to move from the starting index to the end of the array with the minimum possib...
Interview Preparation Tips
Tip 1 : Ability to apply data structures in questions(practice graph and Tree questions)
Tip 2 : Thorough knowledge of the projects done
Tip 3 : Good knowledge about computer science concepts
Tip 1 : Mention projects that you have done yourself and are thorough with
Tip 2 : mention soft skills
Skills evaluated in this interview
Pranav Bhat Thirthahalli
Interview Questionnaire
14 Questions
- Q1. What is race condition and how can it be eliminated
- Q2. What is JCube?
- Ans.
JCube is a Java library for creating and manipulating Rubik's Cube puzzles.
JCube provides classes for representing Rubik's Cube puzzles and algorithms for solving them.
It supports various cube sizes and can generate random scrambles.
JCube can be used in Java applications or as a standalone command-line tool.
It is open source and available on GitHub.
- Q3. What is regression testing?
- Ans.
Regression testing ensures that new code changes do not adversely affect existing functionalities.
Verifies that recent changes haven't introduced new bugs.
Can be automated to save time and increase efficiency.
Example: After adding a new feature, testing existing features to ensure they still work.
Often performed after bug fixes or enhancements.
Includes both manual and automated testing approaches.
- Q4. Discussion on different sorting techniques
- Q5. Discussion on SQL and SQL optimisaion
- Q6. Software engineering principles
- Ans.
Software engineering principles are the best practices and guidelines for developing high-quality software.
Software should be designed with modularity and scalability in mind.
Code should be well-documented and easy to read.
Testing and debugging should be an integral part of the development process.
Version control should be used to manage code changes.
Security and privacy should be considered throughout the development ...
- Q7. Java and OOP's question
- Q8. Define Singleton class
- Ans.
A Singleton class ensures a class has only one instance and provides a global point of access to it.
A Singleton class restricts instantiation to a single object.
It provides a static method to access the instance.
Example in Java: 'public class Singleton { private static Singleton instance; private Singleton() {} public static Singleton getInstance() { if (instance == null) { instance = new Singleton(); } return instance...
- Q9. Explain Testing principles and Design principles
- Ans.
Testing principles ensure software quality, while design principles guide software development.
Testing principles include unit testing, integration testing, and acceptance testing.
Design principles include SOLID, DRY, and KISS.
Testing principles ensure that software meets requirements and is free of defects.
Design principles guide software development to be modular, maintainable, and scalable.
- Q10. Types of machine learning and methods and examples, they may give you a situation and ask you which technique is good and why
- Q11. Why choose you for VISA?
- Ans.
I have the necessary skills, experience, and passion to contribute to VISA's success.
I have a strong background in software development and have worked on projects similar to those at VISA.
I am a quick learner and can adapt to new technologies and programming languages easily.
I am passionate about creating high-quality software that meets the needs of users and exceeds their expectations.
I am a team player and can work...
- Q12. Which profile is good for you?
- Ans.
A profile that challenges me to learn and grow while allowing me to contribute to a team.
A position that encourages continuous learning and development
A role that allows me to collaborate with a team and contribute to projects
A company culture that aligns with my values and work ethic
- Q13. About the work culture at VISA Inc
- Q14. If u already have a placement, why this company
- Ans.
I'm drawn to this company for its innovative projects and values that align with my career goals, despite having a current placement.
The company's commitment to cutting-edge technology aligns with my passion for innovation, as seen in your recent AI project.
I admire your focus on professional development, which is evident from your mentorship programs and employee growth initiatives.
The collaborative culture here excit...
Interview Preparation Tips
Experience: Online Test on mettl.com
- 2 coding questions ( 15*2 = 30 marks ) - Moderate level
- 10 MCQs on Programming and Java ( 1*10 = 10)
- 6 MCQs on Machine Learning and Hadoop ( 1*6 = 6 )
- 6 MCQs on Computer Networks ( 1*6 = 6 )
- 6 MCQs on Computer Infrastructure and Architecture ( 1*6 = 6)
- 6 MCQs on Application security and Cryptography ( 1*6 = 6)
15 shortlisted from here including 8 B.Techs and 7 M.Techs for F2F interviews, which were taken by VISA employees from their US and Singapore offices( since they don't have any office at India ).
Round: Technical Interview
Experience: They may give you a situation and ask you to explain which Software engineering principles will you use. They ask you how will you explain the concept of stacks and queues to a 7 year old, or to a granny, so as to encourage programming(like seriously ? )
General Tips: Nothing as such, since this was my second on-campus placement, I had good experience of interviews.
Keep your fundamentals in all computer science subjects open. Unlike other companies they don't focus much on coding alone. The only other company which also looks at perfection in all computer science aspects is Xerox Research Center India.
Challenging and Equally rewarding, but seriously a unique experience with no much tension
Skills:
College Name: NIT Surathkal
Skills evaluated in this interview
Interview Questionnaire
1 Question
- Q1. Tell me about your project ( written in language)?
- Ans.
Developed a web application using Python and Django framework for managing inventory and sales.
Used Python programming language for backend development
Implemented Django framework for building web application
Designed database schema for inventory and sales data
Integrated frontend using HTML, CSS, and JavaScript
Implemented user authentication and authorization features
Interview Preparation Tips
Experience: They asked 3 question on data structures .
1.Merging linekd list
2 and 3 BST related
Duration: 1 hour
Total Questions: 3
Round: Technical Interview
Experience: Interviewer asked me to explain projects which I had mentioned in Resume. Then He asked me to implement a problem on basis of my project.
It was telephonic round.
CGPA and my project mattered.
College Name: IIT Roorkee
Arpan Paul
I applied via Campus Placement and was interviewed in Sep 2016. There were 4 interview rounds.
Interview Questionnaire
7 Questions
- Q1. Tell me about yourself
- Q2. Explain your resume
- Ans.
My resume highlights my experience in software development and showcases my skills in various programming languages and technologies.
Worked on multiple projects using Java, Python, and C++
Developed web applications using HTML, CSS, and JavaScript
Experience with databases such as MySQL and MongoDB
Familiarity with Agile methodology and version control systems like Git
Participated in hackathons and coding competitions
- Q3. Questions on projects mentioned
- Q4. Why do you want to go for VISA?
- Q5. Code a basic binary tree
- Q6. Code a basic linked list
- Ans.
Code a basic linked list
Create a Node class with data and next pointer
Create a LinkedList class with head pointer
Implement methods to add, delete, and search nodes in the linked list
- Q7. Code a circular linked list
- Ans.
A circular linked list is a data structure where the last node points back to the first node, forming a loop.
Create a Node class with data and next pointer
Initialize the head node and set its next pointer to itself
To add a node, create a new node and set its next pointer to the head node's next pointer, then update the head node's next pointer to the new node
To traverse the circular linked list, start from the head nod...
Interview Preparation Tips
Experience: It was a programming test hosted on hackerrank. A total of 3 questions. I could solve only one of them. That too only a few test cases. Still got shortlisted for the next round. :)
Tips: Do practice a few challenges on programming platforms. Brush up your programming knowledge.
Total Questions: 3
Round: Technical Interview
Experience: It was an HR cum Technical round for me as I came from a non CS background. I was able to convince them I am a perfect fit for VISA
Tips: Do prepare your resume well. If you have coding projects, make sure you are clear with whatever you write. They might quiz you hard on them. Strong knowledge on Data structures and Algorithms will give you an edge.
Skills: Presentation Of Facts In Resume, Basic Coding, Communication, Algorithms And Data Structures
Duration: 2
College Name: IIT Madras
Funny Moments: I am a part of the sponsorship team of our technical and VISA was an associate sponsor for the same the previous year. Hence I had specified this fact in my interview. :P
Skills evaluated in this interview
Interview Preparation Tips
Experience: 4 years og experience
Interview Questionnaire
21 Questions
- Q1. Discussion of previous written test questions
- Q2. Find the odd repeating element from a set of repeating elements
- Ans.
Find the odd repeating element from an array of strings
Use a hash table to count the frequency of each element
Iterate through the hash table to find the element with an odd count
- Q3. A 2D matrix is given which is row wise and column wise sorted. Find a particular element from it
- Ans.
Efficiently search for an element in a sorted 2D matrix using a systematic approach.
Start from the top-right corner of the matrix.
If the current element is equal to the target, return its position.
If the current element is greater than the target, move left.
If the current element is less than the target, move down.
Repeat until you find the element or go out of bounds.
Example: In a matrix [[1, 2, 3], [4, 5, 6], [7, 8, 9...
- Q4. SQL Query to find Nth highest salary from table
- Q5. Another basic SQL query
- Q6. Write a function that returns '3' when '4' is passed as an input and vice versa without using if-else condition
- Ans.
Function to swap '3' and '4' without using if-else
Use XOR operator to swap the values
Convert the input to ASCII code and perform the swap
Use a lookup table to map the values
- Q7. Question on Suffix trees
- Q8. Question on Tries
- Q9. Question on Ternary search trees
- Q10. Question on hash maps
- Q11. Question on complexity of an algorithm
- Q12. 3-4 SQL queries
- Q13. Question on SQL joins
- Q14. JAVA questions on static block,static function and static variables
- Q15. JAVA questions on memory initialization and references
- Q16. Puzzle on measuring exactly half a glass of water
- Q17. Introduce yourself
- Q18. Why PAYTM?
- Ans.
PAYTM is a leading digital payment platform in India, known for its innovation, user-friendly interface, and diverse financial services.
Innovative Technology: PAYTM continuously integrates cutting-edge technology, such as AI and blockchain, to enhance user experience.
Diverse Services: Beyond payments, PAYTM offers services like PAYTM Mall, PAYTM Payments Bank, and PAYTM Insurance, catering to various needs.
User-Centric...
- Q19. Will you go for further studies?
- Ans.
I am open to pursuing further studies to enhance my skills and stay updated with industry trends.
Continuous learning is essential in tech; I plan to take online courses in AI and machine learning.
I may consider a master's degree in software engineering to deepen my knowledge.
Attending workshops and conferences helps me network and learn about new technologies.
- Q20. Why do you think has PAYTM grown so fast?
- Ans.
PAYTM grew fast due to its innovative approach and early adoption of digital payments.
Early adoption of digital payments in India
Innovative approach with features like mobile recharges, bill payments, and cashback offers
Expansion into e-commerce and financial services
Strategic partnerships with major companies like Uber and Alibaba
- Q21. (looking at my CGPA of 9) You can get a better company. Then Why PAYTM only?
Interview Preparation Tips
Experience: there were 20 mcqs and 2 coding questions. It was a pen and paper test. We were given 1 hour to solve it. The mcqs were of average difficulty. The 2 coding questions were:
1. A variation of the standard Josephus Problem
2. Find the 'x' largest elements from 'n' input elements without using sorting.
Tips: They focus on algorithms not on complete solutions. Do not leave any question unattempted. If you do not know the exact approach then use Brute-Force approach.
Round: Technical Interview
Experience: The Interviewer was very nice. He was focussing on the approach used not on codes.
Tips: Be calm and think by basics :)
Round: Technical Interview
Experience: The interviewer asked high level data structures in this round. But again he saw the approach used and not exact solution
Tips: Don't give up. Tell whatever you know
Round: Technical Interview
Experience: JAVA questions were based on very detailed concepts. Study OOP properly.
Tips: Maintain your calm :)
Round: HR Interview
Experience: Overall the experience was nice and smooth.
Tips: If they allow you to ask them any question then ask them something about the company. They should find you interested in the company :)
General Tips: Just be cool. Show them you are enthusiastic to learn and work. While prepration focus on Basics and Algorithms. Prepare DBMS nicely too :)
Skill Tips: Have full knowledge about your projects
Skills: JAVA, Data Structures, Operating systems, Network Programming, DBMS
College Name: NIT Jalandhar
Motivation: PAYTM is a perfect mix for the dynamic startup culture and stability of a big organiztaion. PAYTM has an amazing work culture and excellent opportunities for growth
Skills evaluated in this interview
MAYANK DEEP
Interview Preparation Tips
Experience: There were 3 Questions . One on String manipulation and two were on Binary Trees. All were easy but there was time constraint.
Tips: Practice as many question as possible.
Duration: 60 minutes
Total Questions: 3
Round: Technical Interview
Experience: I was given the problem to design a car pooling system complete with the required classes .. data structures which would be used ... how the database would look like etc..
Tips: General understanding of databases and OOP concepts would do.
Round: Technical Interview
Tips: Be thorough and have in-depth knowledge of each and every point of your resume.
College Name: BITS Pilani
Interview Preparation Tips
College Name: na
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