PayPal Software Engineer II Interview Questions and Answers

Java coding questions, basic Java questions.

Q1. Java basics questions.
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Q2. Live coding.
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Q1. Discussion on previous experience and projects.
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Q2. System design question
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Q1. Questions on SQL, Java advanced, personal projects, Java frameworks, UI based questions, Agile methodologies.
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Q2. Interview discussion with the whole team.
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Q1. Benefits discussion.
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Q2. Salary discussion.
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Basic Oops MCQ and aptitude and one da

Q1. Basic dsa and project
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Q1. DSA and project related
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Q1. DSA round containing 2 coding questions along with some Java Questions
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Q1. Design Round along with some puzzles
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Q1. Managerial Round
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Coding assessment in Code signal which is vedio proctored

Q1. Design a loan application system
Ans. 
Design a loan application system
• Collect applicant information such as personal details, employment history, and financial information

• Include a credit check process to assess applicant's creditworthiness

• Implement a system for loan approval/rejection based on set criteria

• Provide options for different types of loans and repayment plans

• Ensure security measures are in place to protect applicant's sensitive information
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Bank account creation, deposit money, withdraw money

Q1. Question around work experience and how a particular scenario or situation is handled
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Suggest system cost optimization based on given data set

Q1. What is java multithreading
Ans. 
Java multithreading is a feature that allows concurrent execution of multiple threads within a single process.
• Multithreading in Java allows multiple threads to run concurrently within a single process.

• Each thread has its own stack and executes independently, but shares the same memory space.

• Java provides built-in support for multithreading through the java.lang.Thread class and java.lang.Runnable interface.

• Multithreadi...read more
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Q2. Explain exception hierarchy
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Exception hierarchy is a way to organize and categorize different types of exceptions in a software system.
• Exceptions are organized in a tree-like structure with a base class at the top and more specific exception classes below.

• Base class usually is 'Exception' or 'Throwable', with more specific classes like 'IOException', 'NullPointerException', etc.

• Subclasses can provide more specific information about the cause of t...read more
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Q1. Explain Concurrency
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Concurrency is the ability of a system to execute multiple tasks simultaneously.
• Concurrency allows multiple tasks to run concurrently, improving performance and efficiency.

• Concurrency can be achieved through multithreading or multiprocessing.

• Example: A web server handling multiple requests simultaneously using multithreading.
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Q2. Explain Acid principles
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ACID principles are a set of properties that guarantee database transactions are processed reliably.
• Atomicity: Transactions are all or nothing. If one part of the transaction fails, the entire transaction is rolled back.

• Consistency: Transactions bring the database from one valid state to another. All constraints are satisfied.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once...read more
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