Avantor Software Developer Interview Questions and Answers

Q1. How to reverse two numbers without using temp variable
Ans. 
To reverse two numbers without using a temp variable, use bitwise XOR operation.
• Use bitwise XOR operation to swap two numbers without using a temp variable.

• Example: a = 5, b = 7. a = a XOR b, b = a XOR b, a = a XOR b. After this, a = 7, b = 5.
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Q1. Why do you want to join Thermo Fisher
Ans. 
I want to join Thermo Fisher because of their reputation for innovation and impact in the scientific community.
• Thermo Fisher is a leader in the scientific research and healthcare industry

• I am impressed by their commitment to innovation and cutting-edge technology

• I believe working at Thermo Fisher will provide me with opportunities for professional growth and development
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Q1. Self Introduction, explain about your projects
Ans. 
I am a software engineer with experience in developing web applications using Java, Spring Boot, and Angular.
• Developed a web application for a retail company using Java and Spring Boot

• Implemented RESTful APIs for communication between frontend and backend

• Designed and developed user interfaces using Angular framework
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Q2. Rotate an array n times with a O(1) time complexity
Ans. 
Use modular arithmetic to efficiently rotate array n times.
• Use modular arithmetic to calculate the effective number of rotations (n % array length)

• Reverse the entire array

• Reverse the first n elements

• Reverse the remaining elements
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Q1. Self Introduction
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Q2. What do you know about the company
Ans. 
The company is a leading software development firm specializing in creating innovative solutions for various industries.
• Specializes in creating innovative software solutions

• Works with clients from various industries

• Known for high-quality and reliable products

• Has a strong team of software engineers and developers
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Q1. Basics of Java, Oops and collections
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Q1. Questions on OOPs concepts
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Q2. Software development life cycle
Ans. 
Software development life cycle is a process used by software developers to design, develop, test, and deploy software applications.
• SDLC consists of several phases such as planning, analysis, design, implementation, testing, and maintenance.

• Each phase has its own set of activities and deliverables to ensure the successful completion of the project.

• Examples of SDLC models include Waterfall, Agile, Scrum, and DevOps.

• SDLC...read more
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Two coding questions. One using quick sort. The other one was for prime numbers

Questions were asked from data structure topic

Q1. What are oops concepts
Ans. 
Object-oriented programming concepts that focus on data abstraction, encapsulation, inheritance, and polymorphism.
• Abstraction: Hiding complex implementation details and showing only necessary features.

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

• Inheritance: Creating new classes from existing classes to reuse code and extend functionality.

• Polymorphism: Objects of different classes...read more
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Q2. Guess the output of the code
Ans. 
The code will output 'Hello World!'
• The code is a simple print statement that outputs 'Hello World!'

• There are no variables or conditions affecting the output
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Q1. Questions related to testing, current work and Rest API, webservices based questions
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Q1. Python programming language questions like (list, tuple, generators etc)
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Q1. Basic PYTHON Coding, questions related to decorators and regex and Pytest
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Q1. With Hiring Manager, discussed current project and reason for leaving and basic testing process.
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