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PayPal Full Stack Developer Interview Questions, Process, and Tips

Updated 31 Dec 2024

Top PayPal Full Stack Developer Interview Questions and Answers

  • Q1. 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 c ...read more
  • 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 eit ...read more
  • Q3. 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 ...read more
View all 7 questions

PayPal Full Stack Developer Interview Experiences

2 interviews found

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - One-on-one 

(1 Question)

  • Q1. System design interview

I was interviewed in Jul 2021.

Round 1 - Coding Test 

(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 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 ar...

  • Ans. 

    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.

  • Answered by AI
  • 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

  • Answered by AI
Round 2 - Video Call 

(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...

  • Ans. 

    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.

  • Answered by AI
  • 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:

    1. 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.

  • Answered by AI
Round 3 - Video Call 

(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

  • Answered by AI
  • Q2. 

    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 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

  • Answered by AI
Round 4 - HR 

(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

Professional and academic backgroundI completed Computer Science Engineering from VIT University. I applied for the job as Fullstack Developer in ChennaiEligibility criteriaPercentage Criteria in X and XII: 85% or 8.5 CGPA, Pursuing Degree: 85% or 8.5 CGPA, No Standing ArrearsPaypal interview preparation:Topics to prepare for the interview - Trees, Graphs, Dynamic Programming, Arrays, StacksTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

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.

Application resume tips for other job seekers

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.

Final outcome of the interviewSelected

Skills evaluated in this interview

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Interview questions from similar companies

I was interviewed in Dec 2017.

Interview Questionnaire 

3 Questions

  • Q1. You need to find the maximum water pond formed in bw the building
  • Ans. 

    To find the maximum water pond formed between buildings.

    • Identify the lowest point between the buildings.

    • Calculate the area of the pond using the distance between the buildings and the depth of the pond.

    • Consider any obstacles or uneven ground that may affect the pond's shape.

    • Use a surveying tool or satellite imagery to get accurate measurements.

    • Take into account any drainage systems or natural water flow that may affect

  • Answered by AI
  • Q2. On mars you have to place n robots and they are connected via GPS. now you need to move each robot such that the whole mars is visited and each robot visit the minimum area(meaning no overlapping of area)...
  • Q3. Design dictionary using trie....having operations of inserting a word, updating and deleting (needed to write full running code)
  • Ans. 

    Design a dictionary using trie with insert, update and delete operations.

    • Implement a Trie data structure with nodes containing a character and a boolean flag to indicate end of word

    • For insert operation, traverse the trie and add nodes for each character in the word

    • For update operation, delete the existing word and insert the updated word

    • For delete operation, mark the end of word flag as false and delete the node if it ...

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: Simple questions
Duration: 1 hour 10 minutes
Total Questions: 3

College Name: IIT Guwahati

Skills evaluated in this interview

Interview Preparation Tips

Round: Test
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 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

  • Answered by AI
  • Q3. A 2D matrix is given which is row wise and column wise sorted. Find a particular element from it
  • Ans. 

    Finding an element in a sorted 2D matrix

    • Start from the top right corner or bottom left corner

    • Compare the target element with the current element

    • Move left or down if the target is smaller, else move right or up

    • Repeat until the target is found or all elements are checked

  • Answered by AI
  • Q4. SQL Query to find Nth highest salary from table
  • Ans. 

    SQL query to find Nth highest salary from table

    • Use ORDER BY and LIMIT clauses

    • Use subquery to get the Nth highest salary

    • Handle cases where there are less than N distinct salaries

  • Answered by AI
  • 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

  • Answered by AI
  • 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
  • Ans. 

    I am a software developer with experience in Java and Python.

    • Proficient in Java and Python programming languages

    • Experience in developing web applications using Spring framework

    • Familiarity with database management systems like MySQL and MongoDB

  • Answered by AI
  • Q18. Why PAYTM?
  • Ans. 

    PAYTM is a leading digital payment platform in India with a wide range of services.

    • PAYTM has a user-friendly interface and offers a seamless payment experience.

    • It provides a variety of services like mobile recharges, bill payments, and online shopping.

    • PAYTM has a strong focus on security and fraud prevention measures.

    • It has a large user base and is widely accepted by merchants across India.

    • PAYTM is constantly innovatin...

  • Answered by AI
  • Q19. Will you go for further studies?
  • Ans. 

    Yes, I am open to pursuing further studies in the future.

    • I believe in continuous learning and staying updated with the latest technologies.

    • Further studies can help me specialize in a particular field and enhance my skills.

    • I may consider pursuing a master's degree in computer science or a related field.

    • However, my immediate focus is on gaining practical experience and contributing to the organization.

  • Answered by AI
  • 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

  • Answered by AI
  • Q21. (looking at my CGPA of 9) You can get a better company. Then Why PAYTM only?

Interview Preparation Tips

Round: Test
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

Interview Preparation Tips

Skills: Algorithm, Java, Data structure
College Name: na

I was interviewed before Sep 2020.

Round 1 - Face to Face 

Round duration - 45 minutes
Round difficulty - Medium

I applied thorough LinkedIn and got a call from HR for the interview.
I went to their Noida Office.
First round was mainly focused on Javascript fundamentals.
Interviewer was also friendly.

Round 2 - Face to Face 

(2 Questions)

Round duration - 1 hour
Round difficulty - Medium

Second round was after 15 minutes of the first round. The focus of this round was DS & Algorithms.

  • Q1. 

    Find Subarray with Given Sum

    Given an array ARR of N integers and an integer S, determine if there exists a subarray (of positive length) within the given array such that the sum of its elements equals S....

  • Ans. 

    Given an array and a target sum, find a subarray that sums up to the target sum.

    • Iterate through the array while keeping track of the running sum and the starting index of the subarray.

    • Use a hashmap to store the running sum and its corresponding index.

    • If the running sum - target sum is found in the hashmap, it means a subarray with the target sum exists.

    • Return the starting and ending indices of the subarray or [-1, -1]

  • Answered by AI
  • Q2. 

    Minimum Number of Platforms Required

    You are provided with two arrays, AT and DT, representing the arrival and departure times of all trains arriving at a railway station.

    Your task is to determine the m...

  • Ans. 

    This question asks to find the minimum number of platforms required at a railway station so that no train needs to wait.

    • Sort the arrival and departure times arrays in ascending order.

    • Initialize a variable 'platforms' to 1 and 'maxPlatforms' to 1.

    • Iterate through the arrival and departure times arrays simultaneously.

    • If the current arrival time is less than or equal to the current departure time, increment 'platforms'.

    • If ...

  • Answered by AI
Round 3 - Face to Face 

(1 Question)

Round duration - 30 minutes
Round difficulty - Easy

  • Q1. What JavaScript questions did he ask you during the managerial round, and can you describe the work culture of his team?
  • Ans. 

    The interviewer asked about JavaScript questions and the work culture of the team during the managerial round.

    • JavaScript questions related to closures, prototypes, event handling, and asynchronous programming may have been asked.

    • Work culture may involve collaboration, innovation, agile methodologies, and continuous learning.

    • Examples of work culture could include regular team meetings, code reviews, hackathons, and ment

  • Answered by AI
Round 4 - Face to Face 

Round duration - 15 minutes
Round difficulty - Easy

Interview Preparation Tips

Professional and academic backgroundI applied for the job as SDE - 1 in NoidaEligibility criteriaI applied for Frontend role so Javascript was needed.Paytm (One97 Communications Limited) interview preparation:Topics to prepare for the interview - JavaScript,React.js,Java,Node.js,DS & Algo,Time required to prepare for the interview - 1 monthInterview preparation tips for other job seekers

Tip 1 : Be strong at your basics.
Tip 2 : Don't hesitate to ask questions to interviewer.
Tip 3 : Prepare good for DS & Algo as most companies have a separate round for it.

Application resume tips for other job seekers

Tip 1: If possible make 1 page resume
Tip 2: Don't put too many things. Keep it simple. If you're a fresher and have good projects, do put them before your academic section.
Tip 3: Be ready to explain everything you have in your resume.

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before Nov 2023. There was 1 interview round.

Round 1 - Aptitude Test 

1hr aptitude + coding

Interview experience
3
Average
Difficulty level
-
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Referral and was interviewed in Sep 2023. There was 1 interview round.

Round 1 - Coding Test 

Asked to write an in memory SQL database. Time was 1.5 hours. I made the mistake of choosing C++ and writing the code to make it very flexible and extensible. This led to me not being able to complete the task in the given time.
Tip: practice LLD round in a high level language like Python or Typescript. Speed is very important.

I was interviewed before Sep 2020.

Round 1 - Coding Test 

(1 Question)

Round duration - 90 mins
Round difficulty - Hard

There were questions related to DP and DFS.

 

  • Q1. 

    Trapping Rain Water Problem Statement

    You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine th...

  • Ans. 

    Calculate the total amount of rainwater that can be trapped between given elevations in an array.

    • Iterate through the array and calculate the maximum height on the left and right of each bar.

    • Calculate the amount of water that can be trapped at each bar by taking the minimum of the maximum heights on the left and right.

    • Sum up the trapped water at each bar to get the total trapped water for the entire array.

  • Answered by AI
Round 2 - Video Call 

(3 Questions)

Round duration - 60 mins
Round difficulty - Medium

At first, I was asked about the different projects that I have done so far. We had a detailed discussion on the same.
He also checked my OOP concepts

  • Q1. Can you describe the process of designing an LRU Cache from scratch during your System Design Round?
  • Ans. 

    Designing an LRU Cache involves implementing a data structure that stores a fixed number of items and removes the least recently used item when full.

    • Start by defining the data structure for the cache, typically using a combination of a hashmap and a doubly linked list.

    • Implement methods for getting and setting key-value pairs in the cache.

    • When a new item is added to the cache, check if it exceeds the maximum capacity. I...

  • Answered by AI
  • Q2. 

    Reverse Linked List Problem Statement

    Given a Singly Linked List of integers, your task is to reverse the Linked List by altering the links between the nodes.

    Input:

    The first line of input is an intege...
  • Ans. 

    Reverse a singly linked list by altering the links between nodes.

    • Iterate through the linked list and reverse the links between nodes

    • Use three pointers to keep track of the current, previous, and next nodes

    • Update the links between nodes to reverse the list

    • Return the head of the reversed linked list

  • Answered by AI
  • Q3. 

    Middle of a Linked List

    You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.

    If there is an odd number of elements, return the ...

  • Ans. 

    Return the middle element of a singly linked list, or the one farther from the head if there are even elements.

    • Traverse the linked list with two pointers, one moving twice as fast as the other

    • When the fast pointer reaches the end, the slow pointer will be at the middle

    • If there are even elements, return the one that is farther from the head node

    • Handle edge cases like linked list of size 1 or empty list

  • Answered by AI
Round 3 - Video Call 

Round duration - 60 mins
Round difficulty - Medium

It is HR + Technical round
asked about the Behavioural questions and how you justify yourself in an argument .questions related to current technology.
They gave me feedback on how well I had performed so far and gave me suggestions on what more can I do to further improve myself.

Interview Preparation Tips

Professional and academic backgroundI applied for the job as SDE - 1 in BangaloreEligibility criteriaGood ProjectsRazorpay interview preparation:Topics to prepare for the interview - Projects, Development, NoSQL, Data Structure, OOPS, DBMS, Algorithm.Time required to prepare for the interview - 4 monthsInterview preparation tips for other job seekers

Tip 1 : Be thorough about your projects
Tip 2 : Prepare Ds and Algo and Practice all standard questions 
Tip 3 : Know the complexities of the code that you’ve written.

Application resume tips for other job seekers

Tip 1 : Mention at least 2 projects.
Tip 2 : Don't make any silly spelling mistakes on resume

Final outcome of the interviewSelected

Skills evaluated in this interview

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PayPal Interview FAQs

How many rounds are there in PayPal Full Stack Developer interview?
PayPal interview process usually has 1 rounds. The most common rounds in the PayPal interview process are One-on-one Round.
How to prepare for PayPal Full Stack Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at PayPal. The most common topics and skills that interviewers at PayPal expect are Architecture, Data Architecture, Financial Services, Javascript and NoSQL.

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PayPal Full Stack Developer Interview Process

based on 1 interview

Interview experience

5
  
Excellent
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