PayPal Interview Questions, Process, and Tips

It was moderate level sql question and one python question

It was more related to business side in last company

Q1. SQL MODERATE LEVEL
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Q2. PYTHON MODERATE LEVEL problem solving question
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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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Mainly Leet code easy to medium questions

Q1. Design Parking lot with working code.
Ans. 
Design a parking lot system with working code.
• Create classes for ParkingLot, ParkingSpot, Vehicle, etc.

• Implement methods for parking, unparking, checking availability, etc.

• Use data structures like arrays, lists, or maps to manage parking spots.

• Consider different types of vehicles and parking spot sizes.

• Handle edge cases like full parking lot, invalid inputs, etc.
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Q1. Design notification service.
Ans. 
Design a notification service for sending alerts to users.
• Use a scalable messaging system like Kafka or RabbitMQ for handling notifications.

• Implement different types of notifications such as email, SMS, push notifications.

• Allow users to customize their notification preferences and frequency.

• Include features like scheduling notifications and tracking delivery status.

• Ensure security measures are in place to protect user
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Q1. Question related to resume and different tech stack
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Leetcode medium level qustion