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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
(2 Questions)
- Q1. Java threads concepts and its usage
- Q2. Data structures problems and design quentions
Sasi Rekha
I applied via Recruitment Consulltant and was interviewed in Jul 2024. There was 1 interview round.
I have to write code for a load balancer. The code should be testable and imahoild be thread safe
Interview Preparation Tips
- Core Java
I applied via Referral and was interviewed in Sep 2022. There were 5 interview rounds.
(1 Question)
- Q1. Self Introduction about yourself
- Ans.
I am a Backend Associate with experience in developing and maintaining server-side applications.
Proficient in programming languages like Java and Python
Experience in working with databases like MySQL and MongoDB
Familiar with RESTful APIs and microservices architecture
Strong problem-solving and debugging skills
Ability to work in a team and collaborate effectively
(1 Question)
- Q1. How much you know about who's your admire person in your life ?
- Ans.
My admired person in life is my mother.
My mother has always been my source of inspiration and support.
She has taught me the values of hard work, perseverance, and kindness.
Her selflessness and dedication to her family and community are admirable.
She has overcome numerous challenges and always remains positive.
I strive to be like her in both my personal and professional life.
(1 Question)
- Q1. How much you have experienced, specify about your experience
- Ans.
I have 3 years of experience in backend development.
3 years of experience in backend development
Proficient in programming languages like Java and Python
Experience with databases like MySQL and MongoDB
Familiarity with RESTful APIs and web services
Knowledge of version control systems like Git
(1 Question)
- Q1. Do you have all document like your graduation and experience certificate
- Ans.
Yes, I have all the required documents.
I have my graduation certificate from XYZ University.
I also have experience certificates from my previous employers.
I can provide these documents upon request.
Interview Preparation Tips
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
(1 Question)
- Q1. General HR topics, hashmap compleity
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
- Ans.
Minimum cost to reach last cell of 2D matrix with only downward or right moves.
Use dynamic programming approach to solve the problem.
Calculate minimum cost for each cell by considering minimum cost of its adjacent cells.
Final answer will be the minimum cost to reach the last cell.
- Q2. Design a Stack that can support getMin functionality. Whenever it calls getMin on stack it should return the min element in the stack.
- Ans.
Design a stack that supports getMin functionality to return the minimum element in the stack.
Create two stacks, one for storing the actual elements and another for storing the minimum elements.
Push elements onto both stacks simultaneously.
When popping an element, pop from both stacks.
To get the minimum element, peek at the top of the minimum 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
I applied via Recruitment Consulltant and was interviewed in Jul 2024. There was 1 interview round.
I have to write code for a load balancer. The code should be testable and imahoild be thread safe
Interview Preparation Tips
- Core Java
(2 Questions)
- Q1. Java threads concepts and its usage
- Q2. Data structures problems and design quentions
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