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PayPal Backend Developer Interview Questions and Answers
PayPal Backend Developer Interview Experiences
2 interviews found
Aditya Kumar
I applied via Company Website and was interviewed before May 2023. There was 1 interview round.
(1 Question)
- Q1. Five advantages of spring boot Which java version you currently use? Features of the java version you use Output from the code Difference between this and super In order to update the string, which will be...
- Ans.
Spring Boot offers advantages like rapid development, easy configuration, embedded servers, production-ready features, and more.
Rapid development: Spring Boot simplifies the setup and configuration of Spring applications, allowing developers to focus on writing business logic.
Easy configuration: Spring Boot provides auto-configuration, reducing the need for manual setup and boilerplate code.
Embedded servers: Spring Boo...
Interview Preparation Tips
- Core Java
- Spring Boot
- Aspect oriented programming
- Design Patterns
- Exception handling
Skills evaluated in this interview
Anonymous
I applied via Instahyre and was interviewed in Jan 2021. There were 5 interview rounds.
Interview Questionnaire
4 Questions
- Q1. Find loop in linked list
- Ans.
To find a loop in a linked list, we use Floyd's cycle-finding algorithm.
Floyd's cycle-finding algorithm uses two pointers, one moving at a rate of one node per iteration and the other moving at a rate of two nodes per iteration.
If there is a loop in the linked list, the two pointers will eventually meet at some node.
To find the starting point of the loop, we reset one of the pointers to the head of the linked list and ...
- Q2. What challenging task you have done
- Q3. System design related question
- Q4. Explain your current project
Interview Preparation Tips
Skills evaluated in this interview
Interview questions from similar companies
I applied via LinkedIn and was interviewed in Apr 2021. There were 4 interview rounds.
Interview Questionnaire
4 Questions
- Q1. 1. Mininum cost to reach the last cell of a 2D matrix. Required moves are only downward or to the right direction
- Q2. Design a Stack that can support getMin functionality. Whenever it calls getMin on stack it should return the min element in the stack.
- Q3. Design a TreeSet functionality
- Ans.
TreeSet is a data structure that stores unique elements in sorted order.
TreeSet is implemented using a Red-Black tree
It provides O(log n) time complexity for basic operations like add, remove, and contains
It also provides methods like first(), last(), headSet(), tailSet(), and subSet()
TreeSet can be used to implement priority queues and sorting algorithms
- Q4. Design a ArrayList that supprorts all the existing funtions of a list plus getMax functionality also.
- Ans.
Design an ArrayList with getMax functionality.
Create a custom ArrayList class that extends the existing ArrayList class.
Add a getMax() method that returns the maximum value in the list.
Override the add() method to keep track of the maximum value in the list.
Update the maximum value whenever an element is added or removed from the list.
Interview Preparation Tips
Skills evaluated in this interview
(2 Questions)
- Q1. Java threads concepts and its usage
- Q2. Data structures problems and design quentions
What people are saying about PayPal
I applied via Instahyre and was interviewed in Nov 2024. There was 1 interview round.
Machine Coding round on codesignal
It was a machine coding round which revolves around designing a simple application primarily on OOPS
(2 Questions)
- Q1. Best time to sell stocks
- Ans.
The best time to sell stocks is when the market is high and the stock has reached its peak value.
Sell when the stock has reached its peak value to maximize profits
Consider selling if the company's fundamentals have changed negatively
Sell if you need to rebalance your portfolio or have reached your financial goals
- Q2. Best time to sell stocks 2
- Ans.
The best time to sell stocks is when the market is at a peak and the stock price is high.
Monitor market trends and stock performance regularly.
Consider selling when the stock reaches a new high or when you have achieved your profit goals.
Sell if there are negative news or events that could impact the stock price negatively.
PayPal HR Interview Questions
I applied via Naukri.com and was interviewed in Mar 2024. There was 1 interview round.
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Interview Preparation Tips
- DSA
- Core java
- Design Patterns
- Spring Boot
I applied via Campus Placement and was interviewed before Jun 2020. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. Normal coding question medium level , approach focusing rounds actually how you get up to result
Interview Preparation Tips
Interview Preparation Tips
Tips: Have a good grasp of DS algo, java, etc.(Here CGPA doesn't matter)
General Tips: Do’s and Don’ts :
1. Be confident and to be confident prepare well.
2. Set the priority of your companies
3. Don't start preparation at end. Don't ignore the content of resume.
Be confident and start preparation as soon as possible.
College Name: IIT Kanpur
Pranav Bhat Thirthahalli
Interview Questionnaire
14 Questions
- Q1. What is race condition and how can it be eliminated
- Q2. What is JCube?
- Ans.
JCube is a Java library for creating and manipulating Rubik's Cube puzzles.
JCube provides classes for representing Rubik's Cube puzzles and algorithms for solving them.
It supports various cube sizes and can generate random scrambles.
JCube can be used in Java applications or as a standalone command-line tool.
It is open source and available on GitHub.
- Q3. What is regression testing?
- Q4. Discussion on different sorting techniques
- Q5. Discussion on SQL and SQL optimisaion
- Q6. Software engineering principles
- Ans.
Software engineering principles are the best practices and guidelines for developing high-quality software.
Software should be designed with modularity and scalability in mind.
Code should be well-documented and easy to read.
Testing and debugging should be an integral part of the development process.
Version control should be used to manage code changes.
Security and privacy should be considered throughout the development ...
- Q7. Java and OOP's question
- Q8. Define Singleton class
- Q9. Explain Testing principles and Design principles
- Ans.
Testing principles ensure software quality, while design principles guide software development.
Testing principles include unit testing, integration testing, and acceptance testing.
Design principles include SOLID, DRY, and KISS.
Testing principles ensure that software meets requirements and is free of defects.
Design principles guide software development to be modular, maintainable, and scalable.
- Q10. Types of machine learning and methods and examples, they may give you a situation and ask you which technique is good and why
- Q11. Why choose you for VISA?
- Ans.
I have the necessary skills, experience, and passion to contribute to VISA's success.
I have a strong background in software development and have worked on projects similar to those at VISA.
I am a quick learner and can adapt to new technologies and programming languages easily.
I am passionate about creating high-quality software that meets the needs of users and exceeds their expectations.
I am a team player and can work...
- Q12. Which profile is good for you?
- Ans.
A profile that challenges me to learn and grow while allowing me to contribute to a team.
A position that encourages continuous learning and development
A role that allows me to collaborate with a team and contribute to projects
A company culture that aligns with my values and work ethic
- Q13. About the work culture at VISA Inc
- Q14. If u already have a placement, why this company
Interview Preparation Tips
Experience: Online Test on mettl.com
- 2 coding questions ( 15*2 = 30 marks ) - Moderate level
- 10 MCQs on Programming and Java ( 1*10 = 10)
- 6 MCQs on Machine Learning and Hadoop ( 1*6 = 6 )
- 6 MCQs on Computer Networks ( 1*6 = 6 )
- 6 MCQs on Computer Infrastructure and Architecture ( 1*6 = 6)
- 6 MCQs on Application security and Cryptography ( 1*6 = 6)
15 shortlisted from here including 8 B.Techs and 7 M.Techs for F2F interviews, which were taken by VISA employees from their US and Singapore offices( since they don't have any office at India ).
Round: Technical Interview
Experience: They may give you a situation and ask you to explain which Software engineering principles will you use. They ask you how will you explain the concept of stacks and queues to a 7 year old, or to a granny, so as to encourage programming(like seriously ? )
General Tips: Nothing as such, since this was my second on-campus placement, I had good experience of interviews.
Keep your fundamentals in all computer science subjects open. Unlike other companies they don't focus much on coding alone. The only other company which also looks at perfection in all computer science aspects is Xerox Research Center India.
Challenging and Equally rewarding, but seriously a unique experience with no much tension
Skills:
College Name: NIT Surathkal
Skills evaluated in this interview
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