Juspay Interview Questions (2026)

Juspay is a leading financial technology company, that has gained prominence in the industry due to its innovative solutions and cutting-edge payment platform. As part of their rigorous hiring process, Juspay conducts interviews to identify top talent who can contribute to their success. To ensure a fair and comprehensive assessment, Juspay interviewers ask thought-provoking questions that go into various aspects of a candidate's skills, experience, and problem-solving abilities. These questions are designed to evaluate an individual's technical proficiency, adaptability to fast-paced environments, teamwork capabilities, and alignment with Juspay's values. Some commonly asked interview questions at Juspay revolve around topics such as DSA, DBMS, OOPS, OS, and Computer Networks. By scrutinizing responses from candidates during these interviews Juspay effectively identifies individuals who possess the necessary expertise and enthusiasm to drive innovation in digital payments while maintaining a strong customer focus. This article contains some of the most important questions that would help you to land a job at Juspay. Table of Content DSA Questions OS Questions DBMS Questions Computer Networking OOPS DSA Questions Problems Practice Program for factorial of a number Try it Program to Find GCD or HCF of Two Numbers Try it Prime Numbers Try it Program to find sum of elements in a given array Try it Find the Missing Number Try it Nth Fibonacci Number Try it Reverse words in a given string Try it C++ Program to check if a given String is Palindrome or not Try it Program to find whether a given number is power of 2 Try it Count set bits in an integer Try it Find minimum number of coins to make a given value (Coin Change) Try it Swap bits in a given number Try it C++ Program For Binary Search Try it Check if two arrays are equal or not Try it Reverse a Linked List Try it Merge two sorted linked lists Try it Find the middle of a given linked list Try it Introduction and Array Implementation of Queue Try it Implement two Stacks in an Array Try it A program to check if a Binary Tree is BST or not Try it Sorted Array to Balanced BST Try it Convert a Binary Tree into its Mirror Tree (Invert Binary Tree) Try it Check whether a given graph is Bipartite or not Try it Breadth First Search or BFS for a Graph Try it Depth First Search or DFS for a Graph Try it Print Postorder traversal from given Inorder and Preorder traversals Try it Word Break Problem | DP-32 Try it Largest Sum Contiguous Subarray (Kadane’s Algorithm) Try it Find Median from Running Data Stream Try it Combinational Sum Try it N Queen Problem Try it Program to find whether a given number is a power of 2 Try it Find if a string is interleaved of two other strings | DP-33 Try it Frequency of a Substring in a String Try it Print all occurrences of a string as a substring in another string Try it Find Union and Intersection of two unsorted arrays Try it Detect loop or cycle in a linked list Try it Function to check if a singly linked list is palindrome Try it Lowest Common Ancestor in a Binary Tree Try it K’th smallest element in BST using O(1) Extra Space Try it Diameter of a Binary Tree Try it Detect Cycle in a Directed Graph Try it Connected Components in an Undirected Graph Try it Topological Sorting Try it Shortest path in a Binary Maze Try it Level Order Traversal (Breadth First Search or BFS) of Binary Tree Try it Balance a Binary Search Tree Try it Diameter of a Binary Tree Try it Longest Common Subsequence (LCS) Try it 0/1 Knapsack Problem Try it Edit Distance Try it Longest Increasing Subsequence (LIS) Try it Partition of a set into K subsets with equal sum Try it Climbing Stairs to reach at the top. Try it KMP Algorithm for Pattern Searching Try it Tree Isomorphism Problem Try it Ford-Fulkerson Algorithm for Maximum Flow Problem Try it Tarjan’s Algorithm to find Strongly Connected Components Try it Traveling Salesman Problem (TSP) Implementation Try it K’th Smallest/Largest Element in Unsorted Array Try it Matrix Chain Multiplication | DP-8 Try it LRU Cache Try it Check if two strings are permutation of each other Try it Count number of ways to reach destination in a Maze Try it Permutations of given String Try it Fractional Knapsack Problem Try it Rabin-Karp Algorithm for Pattern Searching Try it Josephus Problem Try it Dijkstra's algorithm Try it OS Questions What are the different types of operating systems? Explain the difference between kernel and shell. What is process management? Explain different scheduling algorithms. What is memory management? Discuss different memory allocation techniques. Explain the concept of virtual memory and its benefits. What are the different types of file systems? Explain their advantages and disadvantages. Explain the working of a disk in an operating system. What is deadlock? How can it be prevented or recovered from? Explain the concept of concurrency and how it's handled by the OS. What are the different types of inter-process communication mechanisms? Explain the purpose and functionality of device drivers. Describe the boot process of an operating system. What are the different types of security threats to an operating system? Explain the concept of user management and access control in an OS. What are the different types of system calls and how are they handled? Explain the difference between multiprogramming and multitasking. What are the different types of resource management techniques in an OS? Discuss the advantages and disadvantages of monolithic and microkernel architectures. Explain the concept of virtualization and its applications. How is an operating system customized for specific needs (e.g., embedded systems)? DBMS Questions Explain the ACID properties of transactions and their importance in database integrity. Differentiate between primary and foreign keys with examples. Write an SQL query to join two tables based on specific conditions. Optimize a slow-running SQL query by identifying and correcting bottlenecks. Explain the concepts of normalization and its different levels (1NF, 2NF, 3NF). Describe the purpose and benefits of indexing in a database. Compare and contrast Structured Query Language (SQL) and NoSQL databases. When would you choose one over the other? Explain the concept of database transactions and how they handle concurrency issues. Discuss different types of database views and their advantages in data security and access control. What database schema you will use for Juspay's payment processing system. Explain your data model choices and how they optimize efficiency and scalability. Computer Networking Name two technologies you would use to connect two offices in remote locations. What is internetworking? Explain the different types of network topologies (Bus, Star, Ring, Mesh). Explain the concept of subnetting and its advantages. Describe the working of a router and its functionalities. How does DHCP assign IP addresses to devices in a network? Difference between HTTP Post and HTTP Get Request. Difference between IP address and MAC address. What are the different types of firewalls and their purposes? How does NAT (Network Address Translation) work and what are its benefits? OOPS Explain the concept of inheritance in object-oriented programming. Provide an example of how you would use inheritance to model different payment methods. Explain the role of encapsulation in OOP and its significance in securing sensitive financial data. What is polymorphism, and how does it enhance code flexibility and extensibility in OOP? Describe the principle of abstraction in OOP and its significance in software design. Discuss the advantages and disadvantages of using abstraction in OOP. What are virtual functions and how are they different from pure virtual functions? Explain the concept of constructors and destructors. When are they called? Differentiate between private, and protected access specifiers in C++. What is operator overloading and how can it be implemented in C++? Explain the concept of interfaces in object-oriented programming.