BYJU'S Backend Developer Interview Questions and Answers

Q1. Longest substring without repeating characters
Ans. 
Find the longest substring without repeating characters in a given string.
• Use a sliding window approach to track the longest substring without repeating characters.

• Keep track of the characters seen so far using a hashmap.

• Update the start index of the window when a repeating character is encountered.
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Q2. High level design of a social media app
Ans. 
A social media app allows users to connect, share content, and interact with each other.
• User profiles with personal information and photos

• News feed displaying posts from friends and followed accounts

• Messaging feature for private communication

• Ability to like, comment, and share posts

• Notification system for updates and interactions
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Q1. What are the four pillar of Software Development
Ans. 
The four pillars of Software Development are requirements, design, implementation, and testing.
• Requirements: Gathering and analyzing the needs of the software.

• Design: Creating a blueprint or plan for the software.

• Implementation: Writing the actual code based on the design.

• Testing: Checking the software for bugs and ensuring it meets requirements.
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Q2. Define ACID properties.
Ans. 
ACID properties are a set of properties that guarantee reliable and consistent transactions in a database system.
• Atomicity: All operations in a transaction are completed successfully or none at all.

• Consistency: Data is always in a valid state before and after a transaction.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once a transaction is committed, its changes are permanent
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Sample apitude test verbal reasoning question, English language question

On one topic we have to speak in favour or against

Q1. Why do you want to join this company? Why you want to work in sales market? Tell us about yourself and your work experience.
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Q1. Question related to their company like if it is providing online education why you think online education is important etc.
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Q1. What do you understand by sale
Ans. 
Sales is the process of persuading a potential customer to purchase a product or service.
• Sales involves identifying potential customers and their needs

• It requires building relationships with customers to gain their trust

• Sales also involves presenting the product or service in a compelling way

• Closing the sale by overcoming objections and finalizing the transaction is a key part of sales

• Follow-up after the sale to ensure...read more
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Q2. What qualities you have to be selected as a sale person here.
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Q1. Why are you switching?
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Q2. I want to change city
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Impacts of mobile, Internet is good or bad

Q1. Tell me about yourself?
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Q2. Any company internship?
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Q1. Sales related questions
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