Paypal Interview Questions and Answers
Have you set your sights on a rewarding career at PayPal, the global leader in online payments? Well, buckle up, because landing that dream job requires navigating a series of interview hurdles. But don’t worry because this comprehensive guide equips you with the essential questions to ace your PayPal interview. We’ll delve into a curated selection of frequently asked questions, providing insightful answers to DSA, DBMS, OOPS, OS and CN. Whether you’re a seasoned professional or a fresh graduate, this article empowers you to present your best self and leave a lasting impression. So, let’s unlock the secrets to unlocking your future at PayPal!
Table of Content
- DSA Problems
- OS
- DBMS
- OOPS
- System Desgin
DSA Problems
Operating System(OS)
Operating System lies in the category of system software. It basically manages all the resources of the computer. An operating system acts as an interface between the software and different parts of the computer or the computer hardware.
- What is LRU algorithm?
- What are the semaphores in the os
- What is multithreading
- Difference between Shell and Kernel
- Deadlock Prevention And Avoidance
- Concurrency in Operating System
- What are the different types of security threats to an operating system?
- Discuss the advantages and disadvantages of monolithic and microkernel architectures.
- What are the different types of system calls and how are they handled?
- Explain the concept of virtualization and its applications.
Database Management System (DBMS)
Database Management System is a software or technology used to manage data from a database. Some popular databases are MySQL, Oracle, MongoDB, etc. DBMS provides many operations e.g. creating a database, Storing in the database, updating an existing database, delete from the database.
- What is alter command ?
- SQL query to find second highest salary
- What are the databaselock?
- Explain the ACID properties of transactions and their importance in database integrity.
- Compare and contrast Structured Query Language (SQL) and NoSQL databases.
- Discuss different types of database views and their advantages in data security and access control.
- Explain the concepts of normalization and its different levels (1NF, 2NF, 3NF).
- Optimize a slow-running SQL query by identifying and correcting bottlenecks.
- Write an SQL query to join two tables based on specific conditions.
- What are super, primary, candidate, and foreign keys?
Object Oriented programming(OOPS)
Object-oriented programming – As the name suggests uses objects in programming. Object-oriented programming aims to implement real-world entities like inheritance, hiding, polymorphism, etc. in programming. The main aim of OOP is to bind together the data and the functions that operate on them so that no other part of the code can access this data except that function.
System Design
System Design is defined as a process of creating an architecture for different components, interfaces, and modules of the system and providing corresponding data helpful in implementing such elements in systems.