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Verifone

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3.3

based on 195 Reviews

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Verifone Backend Engineer Lead Interview Questions and Answers

Updated 27 Apr 2022

6 Interview questions

A Backend Engineer Lead was asked 27 Apr 2022
Q. Explain overloading and overriding with examples.
Ans. 

Overloading and overriding are two concepts in object-oriented programming that allow methods to have multiple implementations.

  • Overloading is when a class has multiple methods with the same name but different parameters.

  • Overriding is when a subclass provides a different implementation of a method that is already defined in its superclass.

  • Overloading is resolved at compile-time while overriding is resolved at runti...

A Backend Engineer Lead was asked 27 Apr 2022
Q. Implement a push function for a queue using an array or ArrayList.
Ans. 

Implement Push Function for Queue using Array or ArrayList

  • Create a function that takes an array or ArrayList and a string as input

  • Add the string to the end of the array or ArrayList

  • Return the updated array or ArrayList

Backend Engineer Lead Interview Questions Asked at Other Companies

asked in Verifone
Q1. How do you create an ArrayList and add 5 numbers to it?
View answer (1)
asked in Verifone
Q2. How is a HASHMAP internally stored in Java?
View answer (1)
asked in Verifone
Q3. Implement a push function for a queue using an array or ArrayList ... read more
View answer (1)
asked in Verifone
Q4. Explain each pillar of OOPS with a real-life example
View answer (1)
asked in Verifone
Q5. What features did you implement?
View answer (1)
View All
A Backend Engineer Lead was asked 27 Apr 2022
Q. What features did you implement?
Ans. 

I implemented various features including X, Y, and Z.

  • Implemented feature X which improved system performance by 20%

  • Developed feature Y which allowed for real-time data analysis

  • Added feature Z which improved user experience by simplifying the interface

A Backend Engineer Lead was asked 27 Apr 2022
Q. Explain each pillar of OOPS with a real-life example
Ans. 

Explanation of OOPS pillars with real-life examples

  • Abstraction: Hiding implementation details, e.g. using a TV remote without knowing how it works

  • Encapsulation: Grouping related data and functions, e.g. a car's engine and transmission

  • Inheritance: Creating new classes from existing ones, e.g. a sports car class inheriting from a car class

  • Polymorphism: Using a single interface to represent multiple classes, e.g. a s...

A Backend Engineer Lead was asked 27 Apr 2022
Q. How is a HASHMAP internally stored in Java?
Ans. 

HashMap in Java is internally stored as an array of linked lists.

  • HashMap uses hashing to store key-value pairs

  • Each key is hashed to an index in the array

  • If there are collisions, a linked list is used to store multiple values at the same index

  • The default initial capacity of HashMap is 16 and load factor is 0.75

  • HashMap is not thread-safe and requires synchronization for concurrent access

A Backend Engineer Lead was asked 27 Apr 2022
Q. Write a program to print the Fibonacci sequence.
Ans. 

Print Fibonacci series

  • Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones

  • The first two numbers of the series are always 0 and 1

  • The series can be generated using a loop or recursion

  • Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181

Verifone Backend Engineer Lead Interview Experiences

1 interview found

Backend Engineer Lead Interview Questions & Answers

user image Anonymous

posted on 27 Apr 2022

Round 1 - Aptitude Test 

The duration of this round was around 20 minutes and there were 40 questions in total. This round consisted of standard mathematical, logical aptitude questions. Aptitude questions based on directions, speed and time, profit loss, etc. were asked. Out of 40 questions, around 15 questions were diagram based questions like finding the odd one, predicting the next pattern, etc.

Round 2 - Coding Test 

The Second Round is an Online coding test that lasts for around 30 minutes to 1 hour. It was held on the coder byte platform. There were around 5-6 MCQs and 1 Coding Question. MCQ Questions - Predict the output, find errors, Simple language-based questions etc. The Coding Question was from Arrays, Strings, etc. For Example, You are given a string like “ONE PLUS THREE MINUS TWO” and you will have to give output as “TWO”

They will give you a frontend or Backend role based on your performance in Interviews Rounds.

Round 3 - Technical 

(11 Questions)

  • Q1. 1. Heap theoretical questions were asked
  • Add your answer
  • Q2. 2. Linked List theoretical
  • Add your answer
  • Q3. 3. Reverse String was asked
  • Add your answer
  • Q4. 4. Print FIBONACCI series
  • Ans. 

    Print Fibonacci series

    • Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones

    • The first two numbers of the series are always 0 and 1

    • The series can be generated using a loop or recursion

    • Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181

  • Answered by AI
    Add your answer
  • Q5. 5. Make Push Function for Queue, implement it using Array or Arraylist
  • Ans. 

    Implement Push Function for Queue using Array or ArrayList

    • Create a function that takes an array or ArrayList and a string as input

    • Add the string to the end of the array or ArrayList

    • Return the updated array or ArrayList

  • Answered by AI
    Add your answer
  • Q6. 6. How to make an Arraylist and add 5 numbers in Arraylist
  • Ans. 

    Create an ArrayList and add 5 numbers to it.

    • Declare an ArrayList variable and initialize it

    • Use the add() method to add numbers to the ArrayList

    • Numbers can be of any data type (int, double, etc.)

    • Example: ArrayList<Integer> numbers = new ArrayList<>(); numbers.add(1);

    • Make sure to import the ArrayList class

  • Answered by AI
    Add your answer
  • Q7. 7. How is HASHMAP internally stored in Java?
  • Ans. 

    HashMap in Java is internally stored as an array of linked lists.

    • HashMap uses hashing to store key-value pairs

    • Each key is hashed to an index in the array

    • If there are collisions, a linked list is used to store multiple values at the same index

    • The default initial capacity of HashMap is 16 and load factor is 0.75

    • HashMap is not thread-safe and requires synchronization for concurrent access

  • Answered by AI
    Add your answer
  • Q8. 8. OOPS Pillars were asked
  • Add your answer
  • Q9. 9. Explain each pillar of OOPS with a real-life example
  • Ans. 

    Explanation of OOPS pillars with real-life examples

    • Abstraction: Hiding implementation details, e.g. using a TV remote without knowing how it works

    • Encapsulation: Grouping related data and functions, e.g. a car's engine and transmission

    • Inheritance: Creating new classes from existing ones, e.g. a sports car class inheriting from a car class

    • Polymorphism: Using a single interface to represent multiple classes, e.g. a shape ...

  • Answered by AI
    Add your answer
  • Q10. 10. Object and Classes
  • Add your answer
  • Q11. 11. Overloading and Overriding explain with examples
  • Ans. 

    Overloading and overriding are two concepts in object-oriented programming that allow methods to have multiple implementations.

    • Overloading is when a class has multiple methods with the same name but different parameters.

    • Overriding is when a subclass provides a different implementation of a method that is already defined in its superclass.

    • Overloading is resolved at compile-time while overriding is resolved at runtime.

    • Ex...

  • Answered by AI
    Add your answer
Round 4 - Behavioral 

(3 Questions)

  • Q1. 1. Why did you make this project?
  • Add your answer
  • Q2. 2. What all features did you implement?
  • Ans. 

    I implemented various features including X, Y, and Z.

    • Implemented feature X which improved system performance by 20%

    • Developed feature Y which allowed for real-time data analysis

    • Added feature Z which improved user experience by simplifying the interface

  • Answered by AI
    Add your answer
  • Q3. 3. How will you handle conflict within the team?
  • Add your answer

Interview Preparation Tips

Topics to prepare for Verifone Backend Engineer Lead interview:
  • DSA and OOPS
  • standard mathematical, logical a
  • diagram based questions like fin
  • Aptitude questions based on dire
Interview preparation tips for other job seekers - OOPS and DSA is most important. You must be familiar with all the DSA and Language-based topics. They are expecting someone who is ready to learn new technologies. If you don’t know any topic, then simply say you don’t know it, don’t lie during the interview.

Skills evaluated in this interview

Anonymous

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Job Chahiye Boss, Experience 3 Saal Ka — Lekin Salary Fresher Wali!
👔 HR: "Aapke paas Vue.js, React, Node.js, DevOps, AI sabka experience hai?" 👨‍💻 Main: "Haan, maine toh LinkedIn pe sabki post bhi like ki hai!😅" 🤖 Aaj kal interview mein skills se zyada "you must be available to work under pressure, weekends, and salary delay" pe focus hota hai! 💸 Salary expectation batate hi HR bolta hai — "Oh! We are looking for someone who is passionate... not someone who wants money!🏃‍♂️" 🚀 Lekin fir bhi hum apply karte ja rahe hain, kyunki ghar ke EMI aur Swiggy ke bill ne bhi promise kiya hai — "We will never leave you alone!" 📢 Dear companies, ab to job dedo — experience toh Zindagi bhi de rahi hai daily!
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Interview questions from similar companies

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Software Engineer Interview Questions & Answers

Visa user image Anonymous

posted on 9 Jun 2017

I appeared for an interview in Jun 2017.

Interview Questionnaire 

11 Questions

  • Q1. How does ajax call work
  • Ans. 

    Ajax calls allow for asynchronous communication between client and server without reloading the page.

    • Ajax stands for Asynchronous JavaScript and XML

    • Uses XMLHttpRequest object to send and receive data

    • Allows for partial page updates without reloading the entire page

    • Can handle data in various formats such as JSON, XML, HTML, and plain text

    • Example: $.ajax({url: 'example.com', success: function(data){console.log(data)}});

  • Answered by AI
    View 1 more answer
  • Q2. Difference between REST and SOAP
  • Ans. 

    REST is lightweight and uses HTTP while SOAP is XML-based and has more features.

    • REST uses HTTP methods like GET, POST, PUT, DELETE while SOAP uses XML messaging.

    • REST is stateless while SOAP can maintain state.

    • REST is faster and easier to use while SOAP is more secure and reliable.

    • REST is used for web services while SOAP is used for enterprise-level services.

    • Example of REST: Twitter API. Example of SOAP: Amazon Web Serv...

  • Answered by AI
    Add your answer
  • Q3. What is GET and POST
  • Ans. 

    GET and POST are HTTP methods used for sending data to a server.

    • GET is used to retrieve data from a server

    • POST is used to submit data to a server

    • GET requests can be cached and bookmarked

    • POST requests are not cached and cannot be bookmarked

    • GET requests have length restrictions

    • POST requests have no length restrictions

    • GET requests are less secure than POST requests

  • Answered by AI
    Add your answer
  • Q4. What is observer pattern
  • Ans. 

    Observer pattern is a design pattern in which an object maintains a list of its dependents and notifies them automatically of any state changes.

    • Also known as publish-subscribe pattern

    • Used in event-driven systems

    • Allows loose coupling between objects

    • Example: A weather station broadcasts weather updates to multiple displays

    • Example: A stock market ticker notifies multiple investors of stock price changes

  • Answered by AI
    Add your answer
  • Q5. What is singleton
  • Ans. 

    Singleton is a design pattern that restricts the instantiation of a class to a single object.

    • Singleton ensures that only one instance of a class exists in the entire application.

    • It provides a global point of access to the instance.

    • Commonly used in scenarios where a single instance needs to coordinate actions across the system.

    • Example: Database connection manager, logger, configuration manager.

  • Answered by AI
    Add your answer
  • Q6. What is immutable in java
  • Ans. 

    Immutable in Java refers to objects whose state cannot be changed after creation.

    • String, Integer, and other wrapper classes are immutable in Java.

    • Immutable objects are thread-safe and can be shared without synchronization.

    • To create an immutable class, make all fields final and private, and don't provide setters.

    • Examples of immutable classes in Java include LocalDate, LocalTime, and LocalDateTime.

  • Answered by AI
    Add your answer
  • Q7. How do you create immutable in java
  • Ans. 

    Creating immutable in Java

    • Use final keyword to make variables immutable

    • Use private constructor to prevent object modification

    • Use defensive copying to prevent modification of mutable objects

    • Use enum to create immutable objects

    • Use String class to create immutable strings

  • Answered by AI
    Add your answer
  • Q8. Where have you used immutable in java
  • Add your answer
  • Q9. What is dependency injection
  • Ans. 

    Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.

    • It helps to decouple the code and makes it more testable and maintainable.

    • It allows for easier swapping of dependencies without changing the code.

    • There are three types of dependency injection: constructor injection, setter injection, and interface injection.

    • Example: Instead of creating a database co...

  • Answered by AI
    Add your answer
  • Q10. What is CORS
  • Ans. 

    CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict access to resources from different origins.

    • CORS allows web servers to specify which origins are allowed to access its resources

    • It is implemented using HTTP headers

    • CORS prevents malicious websites from accessing sensitive data from other websites

    • Examples of resources that may be restricted by CORS include cook...

  • Answered by AI
    Add your answer
  • Q11. How do you overcome CORS
  • Ans. 

    CORS can be overcome by configuring the server to allow cross-origin requests.

    • Configure the server to include the Access-Control-Allow-Origin header

    • Use JSONP (JSON with Padding) to bypass CORS restrictions

    • Use a proxy server to make the request on behalf of the client

    • Use a browser extension to disable CORS restrictions during development

    • Use a server-side proxy to forward requests to the target server

  • Answered by AI
    Add your answer

Interview Preparation Tips

Skills: Java Programming

Skills evaluated in this interview

Anonymous

Backend Engineer Lead Interview Questions Asked at Other Companies

asked in Verifone
Q1. How do you create an ArrayList and add 5 numbers to it?
View answer (1)
asked in Verifone
Q2. How is a HASHMAP internally stored in Java?
View answer (1)
asked in Verifone
Q3. Implement a push function for a queue using an array or ArrayList ... read more
View answer (1)
asked in Verifone
Q4. Explain each pillar of OOPS with a real-life example
View answer (1)
asked in Verifone
Q5. What features did you implement?
View answer (1)
View All
company Logo

Software Engineer Interview Questions & Answers

PayPal user image venkatesh

posted on 28 Sep 2015

I applied via Campus Placement

Interview Preparation Tips

Round: Resume Shortlist
Experience: Initially test was conducted. But they also considered resume for shortlisting to interview. Even if you do test badly, resume will come to your rescue if it is good enough.
Tips: Test consists of both aptitude and coding. Basic coding skills in C will be sufficient to solve the coding questions.

General Tips: Interviewing people are very friendly during the interview. Concentrate on concepts like linked lists, basic problems on strongs.
Skill Tips: Any basic C programming book.
Skills: Basic Coding, Basic C/C++
Duration: 2.5
College Name: IIT Madras
Motivation: Diverse fields in which company is working.
Anonymous
company Logo

Software Engineer Interview Questions & Answers

PayPal user image

posted on 14 Dec 2015

I applied via Referral

Interview Questionnaire 

13 Questions

  • Q1. Which is my dream company?
  • Add your answer
  • Q2. What is my biggest achievement till date?
  • Ans. 

    My biggest achievement till date is successfully leading a team to develop and launch a new software product ahead of schedule.

    • Led a team of developers to create a new software product

    • Completed the project ahead of schedule

    • Received positive feedback from clients and stakeholders

  • Answered by AI
    Add your answer
  • Q3. How would I handle conflicts with my team members?
  • Ans. 

    I would address conflicts directly and respectfully, seeking to understand the root cause and find a mutually beneficial solution.

    • Listen actively to understand the other person's perspective

    • Communicate clearly and respectfully

    • Identify the root cause of the conflict

    • Brainstorm potential solutions together

    • Be willing to compromise and find a mutually beneficial solution

  • Answered by AI
    View 1 more answer
  • Q4. I have saved money from a year and bought my dream bike. It is the last round of Paypal interview today. I am on my way on the bike and it breaks down in a no parking zone. Suggest a win­win situation so...
  • Add your answer
  • Q5. What is success according to me?
  • Ans. 

    Success is achieving personal goals, feeling fulfilled, and making a positive impact.

    • Success is subjective and can vary from person to person.

    • It involves setting and achieving goals, both short-term and long-term.

    • Feeling fulfilled and content with one's accomplishments is a key aspect of success.

    • Making a positive impact on others or the world can also be a measure of success.

    • Success is not just about material wealth or...

  • Answered by AI
    Add your answer
  • Q6. I was asked to write a code snippet from my project
  • Add your answer
  • Q7. Program to implement Dijkstra’s algorithm
  • Ans. 

    Dijkstra's algorithm finds the shortest path between nodes in a graph.

    • Create a graph with nodes and edges

    • Assign a tentative distance to each node

    • Set the initial node as current and mark it visited

    • For each neighbor of the current node, calculate the tentative distance

    • If the tentative distance is less than the current distance, update the distance

    • Mark the current node as visited and select the unvisited node with the sma...

  • Answered by AI
    Add your answer
  • Q8. Program to reverse a singly linked list
  • Ans. 

    A program to reverse a singly linked list

    • Create a new empty linked list

    • Traverse the original linked list and insert each node at the beginning of the new list

    • Return the new list

  • Answered by AI
    Add your answer
  • Q9. Which algorithm would I use to sort a linked list and why? Subsequently, I was asked to explain the logic of merge sort
  • Add your answer
  • Q10. Suggest as many methods as possible for finding the nth largest element in an unsorted linked list
  • Ans. 

    Methods to find nth largest element in an unsorted linked list

    • Traverse the linked list and store elements in an array, sort the array and return the nth largest element

    • Use quickselect algorithm to find the nth largest element in O(n) time complexity

    • Implement a max heap and extract the nth largest element

    • Divide the linked list into smaller sublists and recursively find the nth largest element

    • Use merge sort to sort the l...

  • Answered by AI
    Add your answer
  • Q11. How would I explain the concept of prime number to an illiterate?
  • Ans. 

    A prime number is a number that is divisible only by 1 and itself.

    • A prime number has exactly two factors: 1 and itself.

    • Prime numbers cannot be divided evenly by any other number.

    • Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.

  • Answered by AI
    Add your answer
  • Q12. Give a few test cases for a bank transaction
  • Ans. 

    Test cases for a bank transaction

    • Transaction amount within account balance limit

    • Transaction amount exceeds account balance limit

    • Transaction to a valid account number

    • Transaction to an invalid account number

    • Transaction with correct transaction code

    • Transaction with incorrect transaction code

    • Transaction during bank working hours

    • Transaction outside bank working hours

  • Answered by AI
    Add your answer
  • Q13. Design classes for educational institutions in a city
  • Ans. 

    Design classes for educational institutions in a city

    • Identify the main entities: schools, students, teachers, courses

    • Create a School class with attributes like name, address, and a list of students and teachers

    • Create a Student class with attributes like name, age, and a list of courses

    • Create a Teacher class with attributes like name, specialization, and a list of courses

    • Create a Course class with attributes like name, ...

  • Answered by AI
    Add your answer

Interview Preparation Tips

Skills:
College Name: NA

Skills evaluated in this interview

Anonymous
company Logo

Software Engineer Interview Questions & Answers

PayPal user image Jeevan Sankar

posted on 3 Dec 2016

I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.

Interview Questionnaire 

4 Questions

  • Q1. Questions about projects
  • Add your answer
  • Q2. Why Paypal?
  • Ans. 

    Paypal is a leading online payment platform with a strong reputation and global presence.

    • Paypal is a well-established and trusted online payment platform used by millions of users worldwide.

    • It offers secure and convenient payment options for both individuals and businesses.

    • Paypal has a strong focus on innovation and technology, making it an exciting place to work for software engineers.

    • Working at Paypal provides opport...

  • Answered by AI
    Add your answer
  • Q3. What does Paypal do?
  • Ans. 

    Paypal is a digital payment platform that allows individuals and businesses to make online transactions.

    • Paypal provides a secure way to send and receive money online.

    • It allows users to link their bank accounts, credit cards, or debit cards to their Paypal account.

    • Users can make payments to merchants or individuals using their Paypal balance or linked payment methods.

    • Paypal offers buyer and seller protection, dispute re...

  • Answered by AI
    Add your answer
  • Q4. How do you see yourself in 5 years?
  • Ans. 

    In 5 years, I see myself as a senior software engineer leading a team of developers on innovative projects.

    • Continuing to enhance my technical skills and knowledge through ongoing learning and certifications

    • Taking on more leadership responsibilities and mentoring junior team members

    • Contributing to the development of cutting-edge software solutions

    • Building strong relationships with colleagues and stakeholders to drive pr...

  • Answered by AI
    Add your answer

Interview Preparation Tips

Round: Test
Experience: One Programming and 15 multiple choice Questions.
Duration: 1 hour 30 minutes
Total Questions: 16

Round: Technical Interview
Experience: All details about projects you have written on resume. Some different implementation of some parts of your project.

Skills: Knowledge about Database Managements Systems, Problem Solving Skills
College Name: IIT Madras
Anonymous
company Logo

Software Engineer Interview Questions & Answers

PayPal user image leninkumar babu

posted on 3 Dec 2016

I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.

Interview Questionnaire 

11 Questions

  • Q1. Detecting loop in linked list
  • Ans. 

    Detecting loop in a linked list

    • Use two pointers, one moving one node at a time and the other moving two nodes at a time

    • If there is a loop, the two pointers will eventually meet

    • If any of the pointers reach the end of the list, there is no loop

  • Answered by AI
    Add your answer
  • Q2. Write code for dfs
  • Ans. 

    DFS (Depth-First Search) is a graph traversal algorithm that explores as far as possible along each branch before backtracking.

    • DFS uses a stack to keep track of visited nodes and explore adjacent nodes.

    • It can be implemented recursively or iteratively.

    • DFS is useful for solving problems like finding connected components, detecting cycles, and solving mazes.

  • Answered by AI
    Add your answer
  • Q3. How to find cycle in graph
  • Ans. 

    To find a cycle in a graph, use depth-first search (DFS) and keep track of visited nodes.

    • Implement DFS algorithm to traverse the graph

    • Maintain a visited array to keep track of visited nodes

    • If a visited node is encountered again during DFS, a cycle exists

  • Answered by AI
    Add your answer
  • Q4. What is hashing and how will you implement?
  • Ans. 

    Hashing is a process of converting data into a fixed-size numerical value called a hash code.

    • Hashing is used to quickly retrieve data from large datasets.

    • It is commonly used in data structures like hash tables and hash maps.

    • Hash functions should be fast, deterministic, and produce unique hash codes for different inputs.

    • Examples of hash functions include MD5, SHA-1, and SHA-256.

  • Answered by AI
    Add your answer
  • Q5. Questions related to to resume
  • Add your answer
  • Q6. No of pairs between 1 and N satisfy relation pow(a,3)+pow(b,3)=pow(c,3)+pow(d,3).a,b,c,d<=N
  • Ans. 

    The question asks for the number of pairs between 1 and N that satisfy a specific mathematical relation.

    • The relation is pow(a,3) + pow(b,3) = pow(c,3) + pow(d,3)

    • The values of a, b, c, and d should be less than or equal to N

    • Count the number of pairs that satisfy the relation

  • Answered by AI
    Add your answer
  • Q7. -----.php?pid=514
  • Add your answer
  • Q8. Questions related to resume
  • Add your answer
  • Q9. Explain Merge sort
  • Ans. 

    Merge sort is a divide-and-conquer algorithm that recursively divides an array into two halves, sorts them, and then merges them.

    • Divide the array into two halves

    • Recursively sort each half

    • Merge the sorted halves back together

    • Repeat until the entire array is sorted

  • Answered by AI
    Add your answer
  • Q10. Why do you want to join in paypal?
  • Ans. 

    I want to join PayPal because of its innovative technology, global impact, and strong company culture.

    • Innovative technology - PayPal is known for its cutting-edge technology and digital payment solutions.

    • Global impact - Working at PayPal would allow me to contribute to a company that has a worldwide reach and influence.

    • Strong company culture - I value a company that prioritizes diversity, inclusion, and employee well-b...

  • Answered by AI
    Add your answer
  • Q11. Explain anything whatever you learned recently?
  • Ans. 

    I recently learned about the benefits of using Docker for containerization.

    • Docker allows for easy packaging and deployment of applications

    • It helps in creating consistent environments across different platforms

    • Docker containers are lightweight and efficient

    • Example: I used Docker to containerize a microservices architecture for a recent project

  • Answered by AI
    Add your answer

Interview Preparation Tips

Round: Test
Experience: coding question related to palindrome portioning.MCQs related to cs fundamentals
Duration: 1 hour 30 minutes

Skills: General Coding And Problem Solving
College Name: IIT Madras

Skills evaluated in this interview

Anonymous
company Logo

Software Engineer Interview Questions & Answers

PayPal user image Anonymous

posted on 7 Jan 2022

I appeared for an interview before Jan 2021.

Round 1 - Coding Test 

(2 Questions)

Round duration - 90 minutes
Round difficulty - Medium

This was an online test for 90 minutes. 2 programming questions and MCQs related to CS fundamentals were asked.

  • Q1. 

    Cycle Detection in a Singly Linked List

    Determine if a given singly linked list of integers forms a cycle or not.

    A cycle in a linked list occurs when a node's next points back to a previous node in the ...

  • Ans. 

    Detect if a singly linked list forms a cycle by checking if a node's next points back to a previous node.

    • Traverse the linked list using two pointers, one moving one step at a time and the other moving two steps at a time.

    • If the two pointers meet at any point, it indicates the presence of a cycle in the linked list.

    • If one of the pointers reaches the end of the list (null), it means there is no cycle.

  • Answered by AI
    Add your answer
  • Q2. 

    Palindrome Partitioning II Problem Statement

    Given a string ‘str’, find the minimum number of partitions needed such that every segment of the string is a palindrome.

    The task is to make cuts in the stri...

  • Ans. 

    Find the minimum number of partitions needed in a string such that every segment is a palindrome.

    • Iterate through the string and check for palindromes at each possible partition point.

    • Use dynamic programming to keep track of the minimum cuts needed.

    • Consider edge cases where the string is already a palindrome or consists of different characters only.

  • Answered by AI
    Add your answer
Round 2 - Face to Face 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Medium

Technical round that lasted for around 60 minutes. The interviewer asked questions related to data structures and algorithms.

  • Q1. 

    DFS Traversal Problem Statement

    Given an undirected and disconnected graph G(V, E), where V is the number of vertices and E is the number of edges, the connections between vertices are provided in the 'GR...

  • Ans. 

    DFS traversal problem on an undirected and disconnected graph to find connected components.

    • Perform Depth First Search (DFS) on each vertex to find connected components

    • Use a visited array to keep track of visited vertices

    • Print the number of connected components and list vertices in ascending order for each component

  • Answered by AI
    Add your answer
  • Q2. 

    Cycle Detection in Undirected Graph Problem Statement

    You are provided with an undirected graph containing 'N' vertices and 'M' edges. The vertices are numbered from 1 to 'N'. Your objective is to determi...

  • Ans. 

    Detect cycles in an undirected graph with given vertices and edges.

    • Use Depth First Search (DFS) to traverse the graph and detect cycles.

    • Maintain a visited array to keep track of visited vertices and a parent array to keep track of the parent of each vertex.

    • If while traversing, you encounter a visited vertex that is not the parent of the current vertex, then a cycle exists.

    • Consider edge cases like disconnected graphs an...

  • Answered by AI
    Add your answer
Round 3 - Face to Face 

(3 Questions)

Round duration - 60 minutes
Round difficulty - Medium

Technical round that lasted for around 60 minutes. The interviewer asked questions related to data structures and algorithms.

  • Q1. 

    Merge Sort Problem Statement

    You are given a sequence of numbers, ARR. Your task is to return a sorted sequence of ARR in non-descending order using the Merge Sort algorithm.

    Explanation:

    The Merge Sort...

  • Ans. 

    Implement Merge Sort algorithm to sort a sequence of numbers in non-descending order.

    • Implement the Merge Sort algorithm using a Divide and Conquer approach

    • Recursively divide the input array into two halves until the size of each array is 1

    • Merge the sorted halves to produce a completely sorted array

    • Ensure the output is in non-descending order

  • Answered by AI
    Add your answer
  • Q2. 

    Maximum Difference Problem Statement

    Given an array ARR of N elements, your task is to find the maximum difference between any two elements in ARR.

    If the maximum difference is even, print EVEN; if it is...

  • Ans. 

    Find the maximum difference between any two elements in an array and determine if it is even or odd.

    • Iterate through the array to find the maximum and minimum elements

    • Calculate the difference between the maximum and minimum elements

    • Check if the difference is even or odd and return the result

  • Answered by AI
    Add your answer
  • Q3. What is hashing and how can it be implemented?
  • Ans. 

    Hashing is a process of converting input data into a fixed-size string of bytes using a hash function.

    • Hashing is used to securely store passwords by converting them into a hash value before storing in a database.

    • Hashing is used in data structures like hash tables to quickly retrieve data based on a key.

    • Common hash functions include MD5, SHA-1, and SHA-256.

    • Hashing can be implemented in programming languages like Python ...

  • Answered by AI
    Add your answer

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAPaypal interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.:

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

Anonymous
Are these interview questions helpful?
company Logo

Software Engineer Interview Questions & Answers

PayPal user image Anonymous

posted on 13 Jan 2022

I appeared for an interview before Jan 2021.

Round 1 - Face to Face 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round where the interviewer asked questions based on Data structures and algorithms.

  • Q1. 

    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
    Add your answer
  • Q2. 

    Dijkstra's Shortest Path Problem

    Given an undirected graph with ‘V’ vertices (labeled 0, 1, ... , V-1) and ‘E’ edges, where each edge has a weight representing the distance between two connected nodes (X,...

  • Ans. 

    Dijkstra's algorithm is used to find the shortest path from a source node to all other nodes in a graph with weighted edges.

    • Implement Dijkstra's algorithm to find the shortest path distances from the source node to all other nodes.

    • Use a priority queue to efficiently select the next node with the shortest distance.

    • Update the distances of neighboring nodes based on the current node's distance and edge weights.

    • Handle disc...

  • Answered by AI
    Add your answer
Round 2 - Face to Face 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round where the interviewer asked questions based on Data structures and algorithms.

  • Q1. 

    Sort Linked List Based on Actual Values

    Given a Singly Linked List of integers that are sorted based on their absolute values, the task is to sort the linked list based on the actual values.

    The absolute...

  • Ans. 

    Sort a Singly Linked List based on actual values instead of absolute values.

    • Traverse the linked list and store the values in an array.

    • Sort the array based on actual values.

    • Update the linked list with the sorted values.

  • Answered by AI
    Add your answer
  • Q2. 

    Kth Largest Element Problem

    Given an array containing N distinct positive integers and a number K, determine the Kth largest element in the array.

    Example:

    Input:
    N = 6, K = 3, array = [2, 1, 5, 6, 3, ...
  • Ans. 

    Find the Kth largest element in an array of distinct positive integers.

    • Sort the array in non-increasing order to easily find the Kth largest element.

    • Ensure all elements in the array are distinct for accurate results.

    • Handle multiple test cases efficiently by iterating through each case.

  • Answered by AI
    Add your answer
Round 3 - HR 

Round duration - 30 minutes
Round difficulty - Easy

HR Round that lasted for around 30 minutes. The interviewer asked questions to know more about me.

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAPaypal interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, System Design, Aptitude, OOPSTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

Anonymous
company Logo

Software Engineer Interview Questions & Answers

Visa user image Win Vineeth

posted on 3 Dec 2016

I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.

Interview Questionnaire 

7 Questions

  • Q1. Given an array, Implement Binary search tree
  • Ans. 

    Implement Binary Search Tree using given array of strings.

    • Sort the array in ascending order

    • Find the middle element and make it the root of the tree

    • Recursively create left and right subtrees using the left and right halves of the array

    • Repeat until all elements are added to the tree

  • Answered by AI
    Add your answer
  • Q2. Given the above Binary search tree, print in ascending order
  • Ans. 

    Print the given Binary search tree in ascending order

    • Traverse the left subtree recursively

    • Print the root node

    • Traverse the right subtree recursively

  • Answered by AI
    Add your answer
  • Q3. Given an array of stock prices, find where to buy and where to sell for maximum profit in O(n)
  • Ans. 

    Find buy and sell points for maximum profit in an array of stock prices in O(n)

    • Iterate through the array and keep track of the minimum price seen so far

    • Calculate the profit at each index by subtracting the minimum price from the current price

    • Update the maximum profit and buy/sell points accordingly

    • Return the buy and sell points for maximum profit

  • Answered by AI
    Add your answer
  • Q4. Resume based
  • Add your answer
  • Q5. What are three problems Chennai faces?
  • Ans. 

    Chennai faces problems related to water scarcity, traffic congestion, and pollution.

    • Water scarcity due to inadequate rainfall and poor management of water resources.

    • Traffic congestion due to the increasing number of vehicles and poor road infrastructure.

    • Pollution caused by industries, vehicular emissions, and improper waste disposal.

  • Answered by AI
    Add your answer
  • Q6. Which one would you solve and how and why?
  • Ans. 

    Need more context on the question to provide an answer.

    • Please provide more information on the problem to be solved.

    • Without context, it is difficult to provide a solution.

    • Can you please provide more details on the problem statement?

  • Answered by AI
    Add your answer
  • Q7. What is most interesting thing about Visa?
  • Add your answer

Interview Preparation Tips

Round: Test
Experience: 4 Coding questions on Hackerrank platform, one and half hour time. I am not going to reveal the questions here, but one was a basic binary tree implementation and the other three were algorithmic and mathematical problems. They were kinda hard to solve in an hour and half. I could do only 1 and half of the other one. I got 115/300 points on that. I was one of the 16 people selected for the interview.
Tips: It all depends on how well you can focus on the test day. Just practice a lot on hackerrank.
Duration: 1 hour 30 minutes
Total Questions: 4

Round: Technical Interview
Experience: The first two questions I was able to do fast enough. I was also asked a few questions on my resume and coding-related internship. The last one, I showed an O(n*n) algorithm first and then modified it to O(n). Around 45 minutes.
Tips: Be thorough on the coding part in your resume. Think out aloud!

Round: Technical + HR Interview
Experience: Just a few normal questions regarding my projects and my favorite course and it's application to Visa. 15 minutes.
Tips: Once again, be thorough on your resume.

Round: HR Interview
Experience: Once again a normal round, just random questions as to whether I am interested and good enough in communication. 15 minutes.
Tips: Don't get shaken. Be ready for all kinds of questions. Especially about Visa relation to what you do

Skills: Smart Coding
College Name: IIT Madras

Skills evaluated in this interview

Anonymous
company Logo

Software Engineer Interview Questions & Answers

Visa user image Soumya Patro

posted on 12 Jan 2015

Interview Questionnaire 

2 Questions

  • Q1. Why would you like to join Visa and why?
  • Ans. 

    I want to join Visa to contribute to innovative payment solutions and be part of a global leader in financial technology.

    • Visa is at the forefront of digital payment innovation, allowing me to work on cutting-edge technologies.

    • The company's commitment to security aligns with my passion for developing secure software solutions.

    • Visa's global presence offers opportunities to collaborate with diverse teams and learn from di...

  • Answered by AI
    Add your answer
  • Q2. Tell me about yourself
  • Ans. 

    I'm a passionate software engineer with a strong background in full-stack development and a love for problem-solving.

    • Graduated with a degree in Computer Science from XYZ University.

    • Worked at ABC Corp, where I developed a web application that improved user engagement by 30%.

    • Proficient in languages like JavaScript, Python, and Java, with experience in frameworks like React and Django.

    • Enjoy collaborating in agile teams an...

  • Answered by AI
    Add your answer

Interview Preparation Tips

Round: Test
Experience: Coding Questions were fairly standard ones.
Duration: 75 minutes
Total Questions: 42

Round: Interview
Experience: Networks based questions, firewalls, TCP/IP and other OSI layers

Round: Interview
Experience: Coding questions. Asked to code on paper. Questions on Object Oriented Design.

Skills: Networks basics, OOPs basics, Coding Skills
College Name: IIT Guwahati
Motivation: Profiles offered&#44; Package, Location
Anonymous
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  • FinTech
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Verifone Interview FAQs

How many rounds are there in Verifone Backend Engineer Lead interview?
Verifone interview process usually has 4 rounds. The most common rounds in the Verifone interview process are Aptitude Test, Coding Test and Technical.

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