Paypal Interview Questions and Answers Last Updated : 02 Feb, 2024 Improve Improve Like Article Like Save Share Report 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 Problems Practice Jump Game Solve Minimum cost to reach the top of the floor by climbing stairs Solve Largest subarray with equal number of 0s and 1s Solve Maximum Product Subarray Solve Find the maximum sum leaf to root path in a Binary Tree Solve Number of elements with odd factors in given range Solve Minimum number of distinct elements after removing m items Solve Reverse a Linked List in groups of given size Solve Find the element that appears once Solve Print all array elements appearing more than N / K times Solve Lowest Common Ancestor in a Binary Tree using Parent Pointer Solve Merge K sorted linked lists | Set 1 Solve Next Greater Element Solve Subset Sum Problem Solve Count pairs in array whose sum is divisible by K Solve Find the middle of a given linked list Solve Elements that occurred only once in the array Solve Detect the cycle in linked list Solve Find first node of the linked list Solve Find length of loop in linked list Solve Check for BST Solve Boundary Traversal of binary tree Solve Right View of Binary Tree Solve Serialize and Deserialize a Binary Tree Solve Kth largest element in BST Solve ZigZag Tree Traversal Solve Clone a Binary Tree Solve Tree from Postorder and Inorder Solve Cousins of a given node Solve Make Binary Tree From Linked List Solve Trapping Rain Water Solve Total Decoding Messages Solve Jump Game Solve 0 – 1 Knapsack Problem Solve Non-Repeating Element Solve Possible Words From Phone Digits Solve Unique Paths in a Grid Solve Detect cycle in an undirected graph Solve Topological sort Solve Bipartite Graph Solve Number of Provinces Solve X Total Shapes Solve Snake and Ladder Problem Solve Strongly Connected Components (Kosaraju’s Algo) Solve Circle of strings Solve 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. Advantages and Disadvantages of OOPS. Explain the role of encapsulation in OOP and its significance in securing sensitive financial data. How do multiple applications run on our computers at a time? What is polyporphism and its types? What are access specifiers? What is their significance in OOPs?. 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. Design Rate Limiter Design Notification Service Design Vending Machine Design Netflix Like Article Suggest improvement Next Full Stack Developer Interview Questions and Answers Share your thoughts in the comments Add Your Comment Please Login to comment...