Petro Infotech Senior Software Engineer Interview Questions and Answers

Interviewer asked to create a case study on the current project and mention all the technologies involved

Q1. Implement Immutable class
Ans. 
Immutable class is a class whose state cannot be modified after creation.
• Use final keyword to make class immutable

• Make all fields private and final

• Do not provide setter methods

• If mutable objects are used, return a copy instead of original object
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Q2. Solid principles, questions followed by each principle with good and bad examples
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Q1. All questions where asked based on resume
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Q2. Project related questions
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Q1. Based on your resume
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Medium leetcode question related to dp.

LLD round to create a cache library

Q1. Design Paytm like system
Ans. 
Design a system similar to Paytm for online payments and transactions.
• Implement user authentication and authorization for secure transactions

• Develop a user-friendly interface for easy navigation and transactions

• Integrate various payment options like credit/debit cards, net banking, UPI, and wallets

• Implement a robust backend system to handle transactions and store user data securely
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Q2. Design Url Shortner
Ans. 
Design a URL shortener service to generate short URLs for long URLs.
• Use a unique identifier for each long URL to generate a short URL.

• Implement a mapping system to map short URLs to long URLs.

• Consider implementing features like custom short URLs, expiration dates, and analytics.

• Ensure the short URLs are unique and not easily guessable.

• Optimize the service for performance and scalability.
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Q1. Basic beaviour question.
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Q2. Design Notification Service.
Ans. 
Design a Notification Service for sending alerts to users.
• Define types of notifications (email, SMS, push notifications)

• Implement a system for users to subscribe/unsubscribe from notifications

• Include a scheduling system for sending notifications at specific times

• Consider implementing a notification history for users to view past alerts
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Streams related coding questions

Q1. Spring boot, security etc
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Q2. Java multithreading scenarios
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Q3. Scenario based questions on MS side
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Mathematics, logical reasoning

C/C++, device driver, Networking, objectives

Interviewer asked to create a case study on the current project and mention all the technologies involved

Q1. Implement Immutable class
Ans. 
Immutable class is a class whose state cannot be modified after creation.
• Use final keyword to make class immutable

• Make all fields private and final

• Do not provide setter methods

• If mutable objects are used, return a copy instead of original object
Answered by AI
Add your answer
Q2. Solid principles, questions followed by each principle with good and bad examples
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