PayPal Interview Questions, Process, and Tips

One question related to object-oriented programming and one question related to data structures and algorithms.

Q1. DSA - 2 questions need to solve in 45 min with optimal solution one based on recursion and another is based on 2 pointers.
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Q1. Can you describe the system design for the checkout feature on Amazon, including the request body, API calls, load balancing, database caching, and content delivery network (CDN) considerations?
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Q1. Questions regarding your resume, previous company project work, and behavioral topics.
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Q1. Knn algorithm using python
Ans. 
KNN algorithm is a simple and effective machine learning algorithm for classification and regression tasks.
• KNN stands for K-Nearest Neighbors.

• It is a non-parametric, lazy learning algorithm.

• Works by finding the K closest training examples in feature space to a given input data point.

• Classification: Assign the most common class among the K nearest neighbors.

• Regression: Take the average of the K nearest neighbors' target...read more
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Q2. Some LC problem on suffix and prefix
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Q1. Case study on imbalanced dataset
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Q2. Evaluation metrics
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Data structures and algo. 2 ques were asked in hackerrank

Q1. Questions related to System design
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Q1. Basic question related to Spring and Java
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Question base on Tree data structures

Q1. Explain GC collector in Java
Ans. 
GC collector in Java is responsible for managing memory by reclaiming unused objects and freeing up memory space.
• GC stands for Garbage Collector

• Automatically manages memory by reclaiming unused objects

• Prevents memory leaks and optimizes memory usage

• Different types of GC algorithms like Serial, Parallel, CMS, G1

• Example: System.gc() can be used to suggest garbage collection
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Q2. Dynamic programming algorithm question
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Q1. Low level design for Car rental system
Ans. 
Design a car rental system at a low level
• Use object-oriented programming to model cars, customers, rentals, etc.

• Implement a database to store information about available cars, customer bookings, etc.

• Include features like booking, returning, and searching for cars

• Consider implementing a pricing system based on factors like car type, duration of rental, etc.
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Q1. Salary discussion
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