Paypal Interview Questions and Answers Last Updated : 07 Apr, 2025 Comments Improve Suggest changes Like Article Like 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 ProblemsProblemsPracticeJump GameSolveMinimum cost to reach the top of the floor by climbing stairsSolveLargest subarray with equal number of 0s and 1sSolveMaximum Product SubarraySolveFind the maximum sum leaf to root path in a Binary TreeSolveNumber of elements with odd factors in given rangeSolveMinimum number of distinct elements after removing m itemsSolveReverse a Linked List in groups of given sizeSolveFind the element that appears onceSolvePrint all array elements appearing more than N / K timesSolveLowest Common Ancestor in a Binary Tree using Parent PointerSolveMerge K sorted linked lists | Set 1SolveNext Greater ElementSolveSubset Sum ProblemSolveCount pairs in array whose sum is divisible by KSolveFind the middle of a given linked listSolveElements that occurred only once in the arraySolveDetect the cycle in linked listSolveFind first node of the linked listSolveFind length of loop in linked listSolveCheck for BSTSolveBoundary Traversal of binary treeSolveRight View of Binary TreeSolveSerialize and Deserialize a Binary TreeSolveKth largest element in BSTSolveZigZag Tree TraversalSolveClone a Binary TreeSolveTree from Postorder and InorderSolveCousins of a given nodeSolveMake Binary Tree From Linked ListSolveTrapping Rain WaterSolveTotal Decoding MessagesSolveJump GameSolve0 - 1 Knapsack ProblemSolveNon-Repeating ElementSolvePossible Words From Phone DigitsSolveUnique Paths in a GridSolveDetect cycle in an undirected graphSolveTopological sortSolveBipartite GraphSolveNumber of ProvincesSolveX Total ShapesSolveSnake and Ladder ProblemSolveStrongly Connected Components (Kosaraju's Algo)SolveCircle of stringsSolveOperating 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 osWhat is multithreadingDifference between Shell and KernelDeadlock Prevention And AvoidanceConcurrency in Operating SystemWhat 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 salaryWhat 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 DesignSystem 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 LimiterDesign Notification ServiceDesign Vending MachineDesign Netflix Comment More infoAdvertise with us Next Article Paypal Interview Questions and Answers K kartik Follow Improve Article Tags : Interview Experiences PayPal interview-preparation Interview-Questions Company Interview Questions Technical Interview Questions +2 More Practice Tags : PayPal Similar Reads Top HR Interview Questions and Answers (2025) HR interviews can be daunting but they don’t have to be. The bottom line in most hiring processes entails testing the personality of a candidate for their communication traits and company culture fit. 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Preparing to answer in an interview is necessary but you can stand ahead of the crowd by asking your questions. This simple step can directly impact your candidacy and leave a lasting impression on the interviewer. Keep reading 8 min read PayPal Interview Experience SE 2 I got the opportunity to attend the interview through one of my closest friends' referral for a vacant position in his team. Round 1(1 hour): This was a DS and Algorithms round conducted by one of the SDE3s. Remove nth duplicate element from the given linked list. Eg: 1 -> 2 -> 3 -> 1 -> 2 min read Like