PhonePe Backend Developer Interview Questions and Answers

Design a stack that supports getMin functionality to return the minimum element in the stack.

• Create two stacks, one for storing the actual elements and another for storing the minimum elements.

• Push elements onto both stacks simultaneously.

• When popping an element, pop from both stacks.

• To get the minimum element, peek at the top of the minimum stack.

TreeSet is a data structure that stores unique elements in sorted order.

• TreeSet is implemented using a Red-Black tree

• It provides O(log n) time complexity for basic operations like add, remove, and contains

• It also provides methods like first(), last(), headSet(), tailSet(), and subSet()

• TreeSet can be used to implement priority queues and sorting algorithms

Design an ArrayList with getMax functionality.

• Create a custom ArrayList class that extends the existing ArrayList class.

• Add a getMax() method that returns the maximum value in the list.

• Override the add() method to keep track of the maximum value in the list.

• Update the maximum value whenever an element is added or removed from the list.

Our organization follows a combination of manual and automated processes to streamline operations.

• We use project management tools like Jira to track tasks and progress

• Regular team meetings are held to discuss project updates and address any issues

• Automated testing is used to ensure software quality and reduce manual errors

IRD stands for Interface Requirements Document, IDD stands for Interface Design Document, and BRD stands for Business Requirements Document.

• IRD is a document that outlines the requirements for the interface between different systems or components.

• IDD is a document that describes the design of the interface, including the data formats, protocols, and communication methods.

• BRD is a document that captures the business req...read more

Use case diagrams are visual representations of the interactions between users and a system.

• They depict the system's functionality from the user's perspective.

• They show the different actors and their roles in the system.

• They illustrate the various use cases and their relationships.

• They help in identifying the requirements of the system.

• They aid in communication between stakeholders.

• Example: A use case diagram for an on...read more