HCLTech Senior Software Engineer Interview Questions and Answers

Q1. What are singleton classes?
Ans. 
Singleton classes are classes that can only have one instance created throughout the entire application.
• Singleton classes have a private constructor to prevent multiple instances from being created.

• They typically provide a static method to access the single instance.

• Commonly used for logging, database connections, and configuration settings.
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Q2. Whats the difference between interface and abstract class?
Ans. 
Interface is a contract with no implementation, while abstract class can have some implementation.
• Interface cannot have any implementation, only method signatures.

• Abstract class can have both abstract methods and concrete methods.

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

• Interfaces are used for full abstraction, while abstract classes are used for partial abstraction.
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Q1. Salary negotiation
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Q2. Define yourself
Ans. 
I am a highly skilled and experienced Senior Software Engineer with a passion for problem-solving and innovation.
• Experienced in developing and maintaining complex software systems

• Strong problem-solving skills and ability to work well under pressure

• Proficient in multiple programming languages such as Java, Python, and C++

• Excellent communication and teamwork skills, able to collaborate effectively with cross-functional t...read more
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Q1. Sql side : how optimization, given one sample data set to solve
Ans. 
Optimizing SQL queries for a sample data set
• Identify and remove unnecessary joins or subqueries

• Use indexes on columns frequently used in WHERE clauses

• Avoid using SELECT * and only retrieve necessary columns

• Consider using stored procedures for complex queries

• Analyze query execution plans to identify bottlenecks
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Q2. .net side : ways to generate excel without libs, oops concepts,solid principles
Ans. 
To generate Excel without libraries in .NET, utilize Open XML SDK, create XML files with Excel format, and use FileStream to save as .xlsx.
• Utilize Open XML SDK to programmatically create Excel files

• Generate XML files with Excel format using C# code

• Use FileStream to save the XML file as .xlsx format
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Common Linux commands and networking commands

Q1. Check given string is Anagram string or not .
Ans. 
An Anagram string is a string that can be formed by rearranging the letters of another string.
• Check if both strings have the same length.

• Sort the characters of both strings and compare them.

• Alternatively, use a hashmap to count the frequency of characters in both strings.
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Q2. Matrix elements rotation of 90 degree
Ans. 
Rotate the elements of a matrix by 90 degrees clockwise
• Transpose the matrix

• Reverse each row of the transposed matrix
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1 hr and java related questions

Q1. Oops and Collections
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Q2. Java 8 Spring boot Microservices
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Q1. Basic react question
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Q2. What is HOC
Ans. 
HOC stands for Higher Order Component in React, a pattern where a function takes a component and returns a new component.
• HOC is a pattern used in React for code reusability and logic sharing.

• It allows you to reuse component logic without repeating code.

• Examples of HOCs include withRouter, connect, and withStyles in React libraries.
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Q1. Brief about the challenges you have faced in the Currently working project and explain the steps followed to overcome with a perfect solution?
Ans. 
Challenges faced in current project and steps to overcome
• One challenge was integrating a new third-party API with our existing system, which required extensive testing and debugging.

• To overcome this, we created a separate testing environment to ensure the API integration worked smoothly before implementing it in the production environment.

• Another challenge was optimizing the performance of a critical feature, which inv...read more
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Q2. Explain the Latest integration that you have implemented?
Ans. 
Implemented integration with a third-party payment gateway for seamless transactions.
• Researched and selected a suitable payment gateway based on project requirements.

• Developed API endpoints to communicate with the payment gateway.

• Implemented secure tokenization for handling sensitive payment information.

• Tested the integration thoroughly to ensure smooth transactions.

• Provided documentation for future maintenance and tro...read more
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Q1. Why are you looking for a switch from the current company?
Ans. 
Looking for new challenges and growth opportunities.
• Seeking new challenges and opportunities for professional growth

• Interested in working on different technologies or projects

• Desire for a change in work environment or company culture
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Q2. What are your futuristic expectations from us?
Ans. 
I expect a commitment to cutting-edge technologies, opportunities for professional growth, and a collaborative work environment.
• Commitment to adopting and implementing cutting-edge technologies

• Opportunities for continuous learning and professional growth

• A collaborative work environment that fosters innovation and creativity
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