Airtel Payments Bank Software Developer Interview Questions and Answers

Round duration - 45 Minutes
Round difficulty - Medium

Q1. Design a class booking application for students.
Ans. 
A class booking application for students to schedule and manage their classes.
• Create a class booking system where students can view available classes, book classes, and manage their schedule.

• Include features like class search, class details, booking confirmation, and calendar view.

• Implement user authentication to ensure only registered students can book classes.

• Allow students to cancel or reschedule classes with proper...read more
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Round duration - 60 Minutes
Round difficulty - Medium

The interviewer understand the current problem statement I was working on. 
Asked the clarifying questions and alternative approaches to solve the same and their tradeoffs.
Also, asked about the technologies I was using in depth and reason for choosing the same.

Q1. 
Gas Tank Problem Statement
You have a car with a gas tank of infinite capacity. There are 'N' gas stations located along a circular route, numbered from 0 to N-1. You begin your journey with an empty tank...read more
Ans. 
Find the starting gas station index to complete a circular route with gas and cost arrays.
• Iterate through gas stations, keeping track of gas remaining after each station

• If gas remaining is negative, reset starting station to current station + 1

• If total gas remaining at the end is greater than or equal to total cost, return starting station index
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Round duration - 45 Minutes
Round difficulty - Medium

This round was their with the CTO and was mostly the culture fitment round.

Round duration - 30 Minutes
Round difficulty - Easy

This round was with the cofounder and was mostly culture fitment.

2 coding questions .array or string helpful

Q1. Asp .net Oops concept
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Q1. Sql basic question and answer
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Q2. Sql all answers
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They grasping our knowledge

Q1. They check how to grasp they ideas
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Q2. My details want to hire my skills
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They grasping our knowledge

Q1. They check how to grasp they ideas
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Q2. My details want to hire my skills
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Coding round consisted of three problems with easy to moderate level difficulty.

Q1. Variation of Minimum number of platforms required for railway station.
Ans. 
Minimum number of platforms required for a railway station depends on the maximum number of trains arriving and departing at the same time.
• Calculate the maximum number of trains arriving and departing at the same time.

• Determine the time intervals for each train's arrival and departure.

• Add extra platforms for buffer and unexpected delays.

• Consider factors like train length, frequency, and scheduling conflicts.

• Example: If...read more
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Q2. Rearrange the array such that the negative numbers are shifted to the beginning.
Ans. 
Rearrange array with negative numbers at the beginning
• Iterate through the array and move negative numbers to the beginning

• Use two pointers approach to swap elements

• Maintain the order of negative numbers while shifting them to the beginning
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Q1. Implement a simple program using multithreading.
Ans. 
A simple program using multithreading can be implemented to demonstrate parallel execution of tasks.
• Create a class that implements the Runnable interface in Java.

• Override the run() method to define the task that will run in a separate thread.

• Create instances of the class and start them using the Thread class.

• Use synchronization mechanisms like locks or semaphores to manage shared resources in a thread-safe manner.
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Q2. Explain in details about the Java Collections API.
Ans. 
Java Collections API provides a set of classes and interfaces to store and manipulate collections of objects.
• Includes interfaces like List, Set, and Map for different types of collections

• Provides classes like ArrayList, HashSet, and HashMap for implementing collections

• Offers utility classes like Collections for common operations on collections

• Introduced in Java 2 and has been expanded in subsequent versions
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