Infosys Software Developer Interview Questions, Process, and Tips

Q1. What is unit testing and what tools you use?
Ans. 
Unit testing is a software testing technique where individual units or components of a software are tested in isolation.
• Unit testing helps in identifying bugs early in the development process.

• It ensures that each unit of the software performs as expected.

• Common unit testing tools include JUnit, NUnit, PHPUnit, and MSTest.
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Q1. Asked About current Projects
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Q2. Asked to code 2 problems
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Q1. Asked core java and microservices questions
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Q2. Current project and my role
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3 coding questions in 3 hours.

Q1. Introduce yourself
Ans. 
I am a software developer with 5 years of experience in Java, Python, and SQL.
• 5 years of experience in Java, Python, and SQL

• Strong problem-solving skills

• Experience working in Agile development environment
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Q2. Explain about the projects you're working currently
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Q3. Do you have work experience in backend technologies
Ans. 
Yes, I have 3 years of work experience in backend technologies including Java, Spring Boot, and SQL databases.
• Worked with Java for backend development

• Experience with Spring Boot framework

• Proficient in working with SQL databases like MySQL and PostgreSQL
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Q4. Asked few questions in mentioned technologies
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Q5. Explain the logic of longest substring
Ans. 
Longest substring refers to finding the continuous sequence of characters within a string with no repeating characters.
• Iterate through the string and keep track of the characters seen so far

• Use a hashmap to store the index of each character

• Update the start index of the substring when a repeating character is encountered

• Calculate the length of the current substring and update the longest substring found so far
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Maintain a medium level of aptitude while keeping track of the time during the attempt.

Programming can be performed using languages such as Python, Java, C++, and others.

Q1. What is marker interface
Ans. 
A marker interface is an interface with no methods, used to mark classes for special treatment.
• Marker interfaces do not have any methods to implement.

• They are used to add metadata to classes at runtime.

• Examples include Serializable interface in Java.

• Marker interfaces are often used for type checking or to enable special behavior.
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Q2. What difference between abstract and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and non-abstract methods, while interface cannot.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for classes ...read more
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