98thPercentile Senior Software Developer Interview Questions and Answers

Explain about DSA and its example in realtime.

Aptitude test is an exam assume that individuals have inherent strengths and weakness and have a natural inclination towards success or failure in specific areas based on their innate characteristics

Q1. How many programming language do you know? How many development tools have you used? Do you have any technical certifications?
Ans. 
I am proficient in 5 programming languages, have used 8 development tools, and hold 2 technical certifications.
• Proficient in Java, Python, C++, JavaScript, and SQL

• Used development tools like Git, Jenkins, Docker, Visual Studio Code, etc.

• Hold certifications in AWS Solutions Architect and Microsoft Certified Azure Developer
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Q2. What are different types of OS you are comfortable with working?
Ans. 
I am comfortable working with Windows, Linux, and macOS operating systems.
• Windows

• Linux

• macOS
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Q3. What is the extent of your technical expertise?
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Data structures , what is an array,what is linked list,etc

Q1. Tell me about yourself? Tell me about experience? What are your strengths?
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Q1. What is OOPS concepts.
Ans. 
OOPS concepts refer to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation detail
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Q2. What is PDO and uses in PHP.
Ans. 
PDO stands for PHP Data Objects, a database access layer providing a uniform method of access to multiple databases.
• PDO is a PHP extension that provides a data-access abstraction layer.

• It supports multiple database systems like MySQL, PostgreSQL, SQLite, etc.

• PDO helps prevent SQL injection attacks by using prepared statements.

• It allows for error handling and supports transactions.

• Example: $pdo = new PDO('mysql:host=loc...read more
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Ok ok level one round

Moderate level one round

Q1. Easy level one round
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Basic Aptitude test

Coding Round is little tough.

Q1. Formal conversation about the projects and all that kind of stuff
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Q2. What kind of project you have worked on
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Q3. How you tackles different project
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2 coding questions with aptitude question(logical aptitude and quantitative aptitude)

This was a Machine Coding. We need to design a system and then they will check our design by running test cases. It was 2.5 hrs long.

Q1. Basic questions on computer core subjects(Deadlock, Networking, Tcp connection, process scheduling etc, DNS Lookup etc)
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Q2. Questions on React, Node and the libraries which I used in my project(My project was a full stack project)
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Q1. What is latest technology you have worked on
Ans. 
I have worked on React Native for mobile app development.
• Developed a mobile app for a client using React Native

• Used Redux for state management

• Integrated with Firebase for real-time database and authentication

• Implemented push notifications using Firebase Cloud Messaging
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Q1. Why you want to join us
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