PayPal Software Engineer Interview Questions, Process, and Tips

Q1. Rotten oranges problem - DS
Ans. 
Rotten oranges problem involves finding the minimum time required to rot all oranges in a grid.
• Use Breadth First Search (BFS) to traverse the grid and update the ripening time of neighboring oranges.

• Keep track of the fresh oranges and the time taken to rot them all.

• Handle edge cases like no fresh oranges or unreachable oranges.
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Q1. System design for parking lot
Ans. 
Design a system for managing a parking lot efficiently.
• Use a database to store information about available parking spots, vehicles, and payments.

• Implement a system for tracking entry and exit of vehicles.

• Include features like online booking, payment options, and real-time availability updates.

• Consider implementing a ticketing system for managing parking duration and fees.
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Leetcode medium level qustion

There 2 coding rounds one on online and other on one-one discussion, both including few problem solving on DS and Algo on topics of Trees, Priority Queue, Arrays, DFS

Q1. One of the question was about return min element in stack in constant time (O(1)).
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Q2. Find the and return if the given file path existing in the given file hierarcy(file system).
Ans. 
Check if a given file path exists in the file system hierarchy and return the result.
• Use file system APIs to check if the given file path exists in the hierarchy.

• Traverse the file system hierarchy starting from the root directory to find the given file path.

• Return true if the file path exists, false otherwise.
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Q1. This round was regarding LLD and HLD round, question on java and resume and LLD and HLD. Java 1) why functional interface 2) how would you use and make yuor own functional interface 3) Options class Netwo...read more
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Q2. Given a usecase to build parking system
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Q1. This round was about lot of conversation with technical, leadership and cultural aspect with my manager
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2 coding question
Leetcode medium

Q1. Optimal path cost and path in a matrix . Dynamic programming
Ans. 
Finding optimal path cost and path in a matrix using dynamic programming.
• Dynamic programming is a technique to solve problems by breaking them down into smaller subproblems and solving them recursively.

• In this case, we can use dynamic programming to find the optimal path cost and path in a matrix.

• We can start by defining a 2D array to store the minimum cost of reaching each cell in the matrix.

• Then, we can use a recursi...read more
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Q1. 2 coding question + general resume discussion
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Q1. Questions from resume and few general hr question.
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Q2. Where do you see yourself after 2 years? Why do you want to join the company?
Ans. 
In 2 years, I see myself as a senior software engineer, leading a team and contributing to the company's growth. I want to join the company because of its reputation for innovation and its focus on employee development.
• I plan to continue learning and growing my skills in software development

• I hope to take on more leadership responsibilities and mentor junior engineers

• I want to contribute to the company's success by dev...read more
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