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Visa Fullstack Developer Intern Interview Questions and Answers
6 Interview questions
Four Keys Keyboard Problem Statement
Imagine you have a special keyboard with four keys:
- Key 1: (A) to print one ‘A’ on screen.
- Key 2: (Ctrl-A) to select the entire screen.
- Key 3: (Ctrl-C) to copy the...
Given a special keyboard with four keys, determine the maximum number of 'A's that can be printed on the screen by pressing the keys 'N' times.
Use dynamic programming to keep track of the maximum number of 'A's that can be printed at each step.
At each step, consider the possibilities of pressing 'A', 'Ctrl-A', 'Ctrl-C', and 'Ctrl-V'.
Optimally choose the sequence of keys to maximize the number of 'A's printed on th...
Second Most Repeated Word Problem Statement
You are given an array of strings ARR. The task is to find out the second most frequently repeated word in the array. It is guaranteed that each string in the ar...
Find the second most repeated word in an array of strings with unique frequencies.
Iterate through the array and count the frequency of each word using a hashmap.
Sort the hashmap by frequency in descending order.
Return the second key in the sorted hashmap.
Graph Connectivity Queries Problem
Given a graph with N nodes and a threshold value THRESHOLDVALUE, two distinct nodes X and Y are directly connected if there exists a Z such that:
X % Z == 0
Y % Z == 0
Z &...Determine if two nodes in a graph are connected directly or indirectly based on a given threshold value and queries.
Iterate through each query and check if the nodes are connected based on the given conditions
Use the concept of greatest common divisor (GCD) to determine connectivity
Return a list of 1s and 0s indicating connectivity for each query
Snake and Ladder Problem Statement
Given a 'Snake and Ladder' board with N rows and N columns, where positions are numbered from 1 to (N*N) starting from the bottom left, alternating direction each row, fi...
Find the minimum number of dice throws required to reach the last cell on a 'Snake and Ladder' board.
Use Breadth First Search (BFS) algorithm to find the shortest path from start to end cell.
Create a mapping of each cell to its corresponding row and column on the board.
Consider the special cases of snakes and ladders while calculating the next possible moves.
Keep track of visited cells to avoid revisiting them dur...
Longest Common Subsequence Problem Statement
Given two strings STR1 and STR2, determine the length of their longest common subsequence.
A subsequence is a sequence that can be derived from another sequenc...
The task is to find the length of the longest common subsequence between two given strings.
Implement a function to find the longest common subsequence between two strings.
Use dynamic programming to solve the problem efficiently.
Iterate through the strings and build a matrix to store the lengths of common subsequences.
Return the length of the longest common subsequence.
Example: For input STR1 = 'abcde' and STR2 = '...
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 all valid configurations and print them out.
Consider edge cases like N = 1 or N = 2 where no valid configurations exis...
Visa Fullstack Developer Intern Interview Experiences
1 interview found
Anonymous
I appeared for an interview in Aug 2021.
(2 Questions)
Round duration - 75 minutes
Round difficulty - Easy
2 coding problems were asked
Candidates who solved both the questions in the first 45 mins get shortlisted. 12 candidates including me got shortlisted.
- Q1.
Longest Common Subsequence Problem Statement
Given two strings
STR1andSTR2, determine the length of their longest common subsequence.A subsequence is a sequence that can be derived from another sequen...
- Ans.
The task is to find the length of the longest common subsequence between two given strings.
Implement a function to find the longest common subsequence between two strings.
Use dynamic programming to solve the problem efficiently.
Iterate through the strings and build a matrix to store the lengths of common subsequences.
Return the length of the longest common subsequence.
Example: For input STR1 = 'abcde' and STR2 = 'ace',...
- Q2.
Graph Connectivity Queries Problem
Given a graph with
Nnodes and a threshold valueTHRESHOLDVALUE, two distinct nodesXandYare directly connected if there exists aZsuch that:X % Z == 0
Y % Z == 0
Z ... - Ans.
Determine if two nodes in a graph are connected directly or indirectly based on a given threshold value and queries.
Iterate through each query and check if the nodes are connected based on the given conditions
Use the concept of greatest common divisor (GCD) to determine connectivity
Return a list of 1s and 0s indicating connectivity for each query
(4 Questions)
Round duration - 60 minutes
Round difficulty - Easy
Round 2 : HR + Technical Round Time -60 Mins
Firstly we greet each other and then we have talked about my projects and stuff. After that, he gave me some technical questions and I have to choose any three of them and write the code for them. I finished with all the three questions in about 15-20 min since i have solved similar questions while practicing.
What are the various formatting tags in HTML?
What is Pattern Matching in SQL?
After solving those questions we have discussed about our city since i and the interviewer both are from the same city, after that we were finished the interview.
After a very stressful night, the Next day results were declared and 7 out of 12 candidates including me got selected for the internship.
- Q1.
Snake and Ladder Problem Statement
Given a 'Snake and Ladder' board with N rows and N columns, where positions are numbered from 1 to (N*N) starting from the bottom left, alternating direction each row, f...
- Ans.
Find the minimum number of dice throws required to reach the last cell on a 'Snake and Ladder' board.
Use Breadth First Search (BFS) algorithm to find the shortest path from start to end cell.
Create a mapping of each cell to its corresponding row and column on the board.
Consider the special cases of snakes and ladders while calculating the next possible moves.
Keep track of visited cells to avoid revisiting them during t...
- Q2.
Second Most Repeated Word Problem Statement
You are given an array of strings
ARR. The task is to find out the second most frequently repeated word in the array. It is guaranteed that each string in the a... - Ans.
Find the second most repeated word in an array of strings with unique frequencies.
Iterate through the array and count the frequency of each word using a hashmap.
Sort the hashmap by frequency in descending order.
Return the second key in the sorted hashmap.
- Q3.
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...
- 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 all valid configurations and print them out.
Consider edge cases like N = 1 or N = 2 where no valid configurations exist.
- Q4.
Four Keys Keyboard Problem Statement
Imagine you have a special keyboard with four keys:
- Key 1: (A) to print one ‘A’ on screen.
- Key 2: (Ctrl-A) to select the entire screen.
- Key 3: (Ctrl-C) to copy th...
- Ans.
Given a special keyboard with four keys, determine the maximum number of 'A's that can be printed on the screen by pressing the keys 'N' times.
Use dynamic programming to keep track of the maximum number of 'A's that can be printed at each step.
At each step, consider the possibilities of pressing 'A', 'Ctrl-A', 'Ctrl-C', and 'Ctrl-V'.
Optimally choose the sequence of keys to maximize the number of 'A's printed on the scr...
Interview Preparation Tips
Tip 1 : Do at least 4-6 questions daily on leetcode, codingninjas, geeksforgeeks or interviewbit wherever it suits you.
Tip 2 : Do at least 1 good project or an internship in a start up before the internship season
Tip 3 : Focus on Competitive programming also it increases our problem-solving ability exponentially.
Tip 1 : Make a decent resume with a good project or an intern.
Tip 2 : Never fake any point in the resume it will not gonna benefit you .
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
Selected
I applied via Naukri.com and was interviewed before May 2023. There was 1 interview round.
It was good. Mostly questions on spark
Selected
I applied via LinkedIn
(2 Questions)
- Q1. Java Based question answers
- Q2. Array traversal problem
- Ans.
Traverse an array of strings
Use a loop to iterate through each element in the array
Access each element using its index
Perform any necessary operations on each element
Skills evaluated in this interview
Selected
I applied via Campus Placement and was interviewed in Nov 2024. There were 3 interview rounds.
Logical reasoning, grammar, and coding: two basic level questions.
(3 Questions)
- Q1. Question on core Java
- Q2. Question on SQL and PLSQL
- Q3. Resume based question and on project
(2 Questions)
- Q1. Resume and project based question
- Q2. What do you like about your current company, and why do you want to join our organization?
- Ans.
I appreciate the collaborative team environment and innovative projects at my current company, and I am excited about the opportunities for growth and learning at your organization.
Collaborative team environment fosters creativity and productivity
Innovative projects challenge me to learn and grow
Excited about the opportunities for growth and learning at your organization
RAJIVTEJA NAGIPOGU
I applied via Campus Placement and was interviewed in Dec 2016. There were 3 interview rounds.
Interview Questionnaire
6 Questions
- Q1. Given an array of numbers find the subset of numbers that give zero sum.
- Ans.
Find subset of numbers in array that sum up to zero.
Use a nested loop to iterate through all possible subsets.
Calculate the sum of each subset and check if it equals zero.
Store the subset if the sum is zero.
Optimize the solution by using a hash set to store the cumulative sum of elements.
- Q2. Explain how bfs works?
- Ans.
BFS (Breadth-First Search) is a graph traversal algorithm that explores all the vertices of a graph in breadth-first order.
BFS starts at a given vertex and explores all its neighbors before moving to the next level of vertices.
It uses a queue data structure to keep track of the vertices to be visited.
BFS guarantees that it visits all the vertices of a connected graph.
It can be used to find the shortest path between two...
- Q3. Discussion on the projects I have done.
- Q4. Question on Linked List.
- Q5. Project Discussion
- Q6. Strengths and weaknesses. Where do you see yourself in 5 years?
- Ans.
In 5 years, I see myself as a highly skilled software developer, leading a team and contributing to innovative projects.
Continuously improving my technical skills through learning and hands-on experience
Taking on leadership roles and mentoring junior developers
Contributing to the development of cutting-edge software solutions
Building strong relationships with clients and stakeholders
Staying updated with the latest indu...
Interview Preparation Tips
Experience: I couldn't find an optimal approach to the first question, so she skipped that question and proceeded to next questions. Remaining questions I have answered satisfactorily.
Round: Technical + HR Interview
Experience: I told that my strength is problem solving and I can always find a way when there is a bottle-neck. Gave some examples of my experiences while doing my assignments.
College Name: IIT Madras
Skills evaluated in this interview
I applied via Campus Placement
Interview Preparation Tips
Experience: Aptitude questions were logical, not tough. For coding, one question, not basic but very logical.
Tips: for coding part try practicing on hackerrank.
Duration: 45+30 minutes
Total Questions: 20+1
Round: Technical Interview
Experience: Interviewer asked all about Linked list and Data structures and algorithm.
Tips: Atleast try learning some basic concepts of linked list, stacks, queues and binary tree.
General Tips: Interview was fair, without any partiality for girls/boys or B.Tech/Dual.
Skill Tips: Be confident and reply frankly. Never let them know that you are nervous.
Skills: Confidence
Duration: 2.5
College Name: IIT Madras
Funny Moments: "Lets go for a walk". HR interviewer will take you for a round to ask you HR questions.
Please prepare for two questions "Tell me something about you" and "Why PayPal, why not any other company".
Aditya V Kamath
Interview Questionnaire
9 Questions
- Q1. Explain the concepts of Object Oriented Programming
- Ans.
Object Oriented Programming is a programming paradigm that uses objects to represent real-world entities.
Encapsulation: bundling data and methods that operate on that data within one unit
Inheritance: creating new classes from existing ones, inheriting their properties and methods
Polymorphism: ability of objects to take on multiple forms or behaviors
Abstraction: hiding complex implementation details and providing a simp...
- Q2. Give examples of abstraction and polymorphism
- Ans.
Abstraction is hiding implementation details while polymorphism is using a single interface for multiple types.
Abstraction: Encapsulation, Interfaces, Abstract classes
Polymorphism: Method Overloading, Method Overriding, Interfaces
Abstraction Example: Car - we don't need to know how the engine works to drive it
Polymorphism Example: Animal - different animals have different sounds but they all have a 'makeSound' method
- Q3. A simple design question to design classes
- Ans.
Design classes for a simple library management system with books and users.
Class Book: Attributes include title, author, ISBN, and availability status.
Class User: Attributes include name, user ID, and a list of borrowed books.
Class Library: Methods to add/remove books, register users, and manage book loans.
Example: Book class could have a method to check availability before loaning.
- Q4. What does PayPal do?
- Ans.
PayPal is an online payment system that allows individuals and businesses to transfer funds electronically.
Allows users to make payments and money transfers online
Offers a secure and convenient way to pay for goods and services
Provides a platform for businesses to accept payments online
Offers buyer and seller protection for eligible transactions
Can be used to send and receive money internationally
- Q5. A simple Machine learning question to use thresholding
- Ans.
Thresholding is a technique in machine learning used to classify data based on a defined cutoff value.
Thresholding converts continuous data into discrete classes.
Example: In image processing, pixels above a certain intensity are classified as 'foreground'.
In binary classification, a threshold can determine if an output is 'positive' or 'negative'.
Choosing the right threshold is crucial for model performance; it can aff...
- Q6. Questions about Software Defined Networking and my project in that field
- Q7. Questions about my internships at a startup and USC
- Q8. Am I considering going for masters
- Q9. What makes you want to join PayPal?
- Ans.
I am excited to join PayPal because of its innovative culture and impact on the global economy.
PayPal's commitment to innovation aligns with my passion for staying up-to-date with the latest technologies.
I am impressed by PayPal's global reach and impact on the economy, and I want to be a part of that.
I appreciate PayPal's focus on diversity and inclusion, and I believe in the importance of working for a company with s...
Interview Preparation Tips
Experience: The aptitude test consisted of about 20 questions and had just 20 minutes. The questions were tough and you need speed to solve them. People preparing for CAT and other such exams should be able to perform better. The max score among my batch was 7 or 8.
The coding question was paper based and you had to write C code for a simple question on paper, but design was also taken into account for evaluating the code.
Tips: Both get disheartened if you don't do well in the aptitude.
Duration: 60 minutes
Total Questions: 21
Round: Technical Interview
Experience: The interview was more like a discussion rather than a question answer round. The discussion always went quite off the topic and the interviewer went on to ask other concepts of OS and networks etc.
Tips: Be thorough with the core concepts in subjects like OS and networks
Round: Technical Interview
Experience: This interview was a little more of marketing PayPal to me than an interview. He however slipped in the questions given above. The machine learning question was a little too obvious to apply thresholding and I wasted time trying to get better algorithms when he expected only thresholding.
Tips: Do not tell you are the topper if you are, because I did and he clearly said they don't hire toppers!
Round: HR Interview
Experience: This interview was more to get the truth out of me. I have a very research oriented profile and that was evident from my resume. The interview was to find out whether I would really join their company if offered.
Tips: If you have a high CG and research experience but still want to go for a job, make sure you tune your resume to prune out the research and only market the side which the company looks for, otherwise the company will reject you.
Skills: Computer Science Concepts, OS, Networks, OOP, Machine Learning
College Name: IIT HYDERABAD
Motivation: Just as a backup since I was indeed planning for a masters program. Highest paying package among the companies at that time.
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.
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
- 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
- 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
- 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
- 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...
- 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.
- 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
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