PayPal Interview Questions, Process, and Tips

Q1. Tell me about yourself
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Q2. What do you expect about your next role, why do you want to change your job
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Q3. What do you like and dont like about your current role
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Q1. Knn algorithm using python
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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
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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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Ask about how to implement DQ

Q1. Introduction about yourself
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Q2. Basic golang questions
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Coding questions on DSA

Q1. Basic Java related questions, OOPs concepts
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Q2. Write code for encryption of the code
Ans. 
Encryption of code involves converting plaintext into ciphertext to secure data.
• Choose a strong encryption algorithm like AES or RSA

• Generate a key for encryption

• Encrypt the plaintext using the key and algorithm

• Store or transmit the ciphertext securely
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Q1. Java Related questions, also some system design-related questions
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Q2. Show the abstraction and write code for function overriding
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Abstraction is hiding the implementation details, function overriding is providing a new implementation for a method in a subclass.
• Abstraction involves hiding the complex implementation details and showing only the necessary features to the user.

• Function overriding occurs in inheritance when a subclass provides a specific implementation for a method that is already defined in its superclass.

• Example: Parent class 'Anima...read more
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Q1. Normal questions related to projects and work ethics
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