Infosys Senior Software Engineer Interview Questions and Answers for Freshers

Q1. Difference between out and ref.
Ans. 
Out is used for returning multiple values from a method, while ref is used for passing a variable by reference.
• Out parameters must be assigned a value inside the method before it returns.

• Ref parameters must be initialized before passing them to a method.

• Out parameters are used when a method needs to return multiple values.

• Ref parameters are used when a method needs to modify the value of the parameter.

• Example: int.TryP...read more
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Q2. Sql query to find the 2nd last student marks
Ans. 
Use a SQL query with ORDER BY and LIMIT to find the 2nd last student marks.
• Use ORDER BY clause to sort the marks in descending order

• Use LIMIT 1,1 to skip the last row and fetch the 2nd last row
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Q3. Second round was around project specific like why mongodb or posgreSQL? Project architecture and followup questions.
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Q4. Create global exception handler.
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Create a global exception handler to manage all unhandled exceptions in the application.
• Implement a global exception handler class that extends ExceptionHandler.

• Override the uncaughtException method to handle all unhandled exceptions.

• Log the exception details and notify the user about the error.

• Consider implementing different strategies for handling different types of exceptions.

• Test the global exception handler thorou...read more
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Q1. Explain about your roles and responsibilities
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Q2. What is scope of performance testing
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Performance testing ensures software meets speed, stability, and scalability requirements.
• Performance testing identifies bottlenecks and measures response time, throughput, and resource utilization.

• It helps optimize system performance, improve user experience, and prevent crashes under high load.

• Examples include load testing, stress testing, and endurance testing.

• Performance testing should be conducted throughout the s...read more
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Q1. Explain about your project roles
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Q2. What are critical issues you faced while recording the script
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Q1. What is your expected CTC
Ans. 
My expected CTC is in line with industry standards and commensurate with my experience and skills.
• Research industry standards and salary ranges for the position and location

• Consider my experience, skills, and qualifications

• Negotiate based on the company's compensation package and benefits

• Provide a range rather than a specific number
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Q2. When can you join in the organisation
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It was mass placement from our college. First round was an aptitude test which had direct filtration.

Q1. Second round was one on one technical interview. It was based on OOPS concepts and core C++ concepts.
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Q2. What is OOP? Write pseudo code to design library management system. What is RDBMS. Write a program to reverse a string.
Ans. 
OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOP focuses on creating objects that contain both data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Example: In a library management system, you could have objects like Book, Patron, and Library.

• Example: Inheritance allows a FictionBook class to inherit propert...read more
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Basic quants and grammar questions

Q1. Basic coding questions
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Q2. Palindrom coding question
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A palindrome is a word, phrase, or sequence that reads the same backward as forward, like 'racecar'.
• A simple example is 'madam', which is the same when reversed.

• Phrases like 'A man, a plan, a canal, Panama!' ignore spaces and punctuation.

• To check if a string is a palindrome, compare it to its reverse.
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