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Worldline Java Developer Interview Questions and Answers

Updated 3 Oct 2024

Worldline Java Developer Interview Experiences

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Java Developer Interview Questions & Answers

user image Rahul Kohadkar

posted on 3 Oct 2024

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

I was interviewed in Sep 2024.

Round 1 - Technical 

(2 Questions)

  • Q1. Basics of OOPS concept
  • Q2. Project experience
  • Ans. 

    Developed a web application for a retail company to manage inventory and sales.

    • Used Java, Spring framework, and MySQL for backend development

    • Implemented user authentication and authorization using Spring Security

    • Utilized JavaScript and HTML/CSS for frontend development

    • Integrated payment gateway for online transactions

  • Answered by AI

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Software Developer Interview Questions & Answers

PayPal user image RAJIVTEJA NAGIPOGU

posted on 3 Dec 2016

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.

  • Answered by AI
  • 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

  • Answered by AI
  • 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...

  • Answered by AI

Interview Preparation Tips

Round: Technical Interview
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

Round: Test
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".

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...

  • Answered by AI
  • 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

  • Answered by AI
  • Q3. A simple design question to design classes
  • 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

  • Answered by AI
  • Q5. A simple Machine learning question to use thresholding
  • 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...

  • Answered by AI

Interview Preparation Tips

Round: Test
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 Questionnaire 

11 Questions

  • Q1. What is the difference between multi tasking, multi processing and multi programming operating systems with examples ?
  • Ans. 

    Multi tasking, multi processing, and multi programming are different approaches to managing tasks in an operating system.

    • Multi tasking allows multiple tasks to run concurrently on a single processor.

    • Multi processing involves multiple processors running tasks simultaneously.

    • Multi programming allows multiple programs to be loaded into memory and executed concurrently.

    • Examples of multi tasking operating systems include Wi...

  • Answered by AI
  • Q2. Tell me about memory allocation (stack vs. heap)?
  • Ans. 

    Memory allocation refers to the process of assigning memory to programs during runtime.

    • Stack allocation is done automatically and is limited in size.

    • Heap allocation is done manually and is larger in size.

    • Stack memory is used for local variables and function calls.

    • Heap memory is used for dynamic memory allocation.

    • Memory leaks can occur if heap memory is not properly managed.

  • Answered by AI
  • Q3. You have two threads one printing even numbers in order and other odd numbers. Design an algorithm so that it prints numbers in natural order?
  • Ans. 

    Use a shared variable and synchronization mechanisms to ensure natural order printing of numbers.

    • Create two threads, one for printing even numbers and the other for printing odd numbers.

    • Use a shared variable to keep track of the current number to be printed.

    • Implement synchronization mechanisms like locks or semaphores to ensure only one thread can access the shared variable at a time.

    • Each thread should check if it is i...

  • Answered by AI
  • Q4. Print a matrix in spiral order?
  • Ans. 

    Printing a matrix in spiral order

    • Start from the first element and print it

    • Move in a spiral order towards the center of the matrix

    • Repeat until all elements are printed

  • Answered by AI
  • Q5. Thread class and Runnable Interface?
  • Ans. 

    Thread class and Runnable Interface are used for multithreading in Java.

    • Thread class is a predefined class in Java that provides methods to create and control threads.

    • Runnable interface is used to define a task that can be executed by a thread.

    • Thread class implements Runnable interface.

    • Thread class provides more control over threads than Runnable interface.

    • Example: Thread t = new Thread(new MyRunnable()); t.start();

    • Exa...

  • Answered by AI
  • Q6. What’s the difference between a Linked List and an ArrayList and give me an example of when to use which?
  • Ans. 

    Linked List is a dynamic data structure while ArrayList is a static data structure.

    • Linked List is best for frequent insertion and deletion operations.

    • ArrayList is best for frequent access operations.

    • Linked List uses more memory than ArrayList.

    • ArrayList is faster than Linked List for accessing elements.

    • Use Linked List when you need to frequently add or remove elements from the list.

    • Use ArrayList when you need to frequen

  • Answered by AI
  • Q7. Questions of OS concepts?
  • Q8. A role play scenario was given. With a clear instruction on I don’t need to know the basis and the hypothetical assumption was presented. I was told that I was expected to respond to the given scenario, in...
  • Q9. Why are you interested in a career in investment banking?
  • Ans. 

    I am not interested in a career in investment banking.

    • I am more interested in a career in software development

    • I enjoy problem-solving and creating innovative solutions through coding

    • Investment banking does not align with my passion and skill set

  • Answered by AI
  • Q10. Why have you chosen to apply to J.P. Morgan?
  • Ans. 

    I have chosen to apply to J.P. Morgan because of their reputation, global presence, and opportunities for growth.

    • J.P. Morgan has a strong reputation in the financial industry.

    • They have a global presence with offices in multiple countries.

    • The company offers various opportunities for career growth and development.

    • J.P. Morgan is known for its innovative technology solutions in the financial sector.

    • I am impressed by their ...

  • Answered by AI
  • Q11. Have you ever made a mistake? Tell us about it?
  • Ans. 

    Yes, I have made a mistake in my previous project.

    • I underestimated the complexity of a task and ended up missing the deadline.

    • I failed to properly test a feature, resulting in a bug that affected user experience.

    • I accidentally deleted an important file without having a backup.

    • I misunderstood a requirement and implemented a feature incorrectly.

  • Answered by AI

Interview Preparation Tips

Round: Test
Total Questions: 1

General Tips: Interview Process: Aptitude test, followed by 3 rounds of interview. Interview process was very good. Just be positive to clear the interview.
Check this link before appearing for interview with JP Morgan. It will help  -----
Skills: Algorithm, Data structure, Stack
College Name: Na

Skills evaluated in this interview

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

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 Preparation Tips

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

I applied via LinkedIn and was interviewed in Dec 2020. There were 3 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. Technical questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Make sure always you tell the right thing on which you are working and you should have clear understanding on your technical skill whatever you know.

I applied via Naukri.com and was interviewed in Mar 2021. There was 1 interview round.

Interview Questionnaire 

3 Questions

  • Q1. What are lod in tableau
  • Ans. 

    LOD stands for Level of Detail. It is a technique in Tableau that allows users to compute values at a different level than the view.

    • LOD expressions can be used to aggregate data at a higher level than the view, or to compute values at a lower level than the view.

    • There are three types of LOD expressions: FIXED, INCLUDE, and EXCLUDE.

    • FIXED LOD expressions compute values using a specified set of dimensions, regardless of t...

  • Answered by AI
  • Q2. What are hyper in tableau
  • Ans. 

    Hyper is a data engine used by Tableau to process large amounts of data quickly.

    • Hyper is an in-memory data engine that can process billions of rows of data.

    • It allows for faster data analysis and visualization.

    • Hyper can handle complex queries and calculations.

    • Tableau uses Hyper as its default data engine since version 10.5.

    • Hyper can also be used as a standalone database.

    • Hyper supports various data sources including CSV,

  • Answered by AI
  • Q3. What are parameters in tableau
  • Ans. 

    Parameters in Tableau are dynamic inputs that allow users to change values in a visualization.

    • Parameters can be used to filter data, change calculations, and control the appearance of a visualization.

    • They can be created by right-clicking on a field or by using the 'Create Parameter' option in the 'Analysis' menu.

    • Examples of parameters include allowing users to select a date range, adjusting the size of a chart, or chan...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Be very calm, patient and confident while facing the interview.Always give your best and good will happen.
All the best

Skills evaluated in this interview

Worldline Interview FAQs

How many rounds are there in Worldline Java Developer interview?
Worldline interview process usually has 1 rounds. The most common rounds in the Worldline interview process are Technical.
How to prepare for Worldline Java 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 Worldline. The most common topics and skills that interviewers at Worldline expect are Java, Spring Boot, Microservices, Hibernate and Banking Operations.

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Worldline Java Developer Interview Process

based on 1 interview

Interview experience

3
  
Average
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Worldline Java Developer Salary
based on 9 salaries
₹8 L/yr - ₹11.1 L/yr
69% more than the average Java Developer Salary in India
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Worldline Java Developer Reviews and Ratings

based on 2 reviews

4.0/5

Rating in categories

4.0

Skill development

3.0

Work-life balance

4.0

Salary

3.0

Job security

5.0

Company culture

3.0

Promotions

3.4

Work satisfaction

Explore 2 Reviews and Ratings
Java Developer

Mumbai

2-5 Yrs

₹ 4.5-9.5 LPA

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