PerkinElmer Validation Engineer Interview Questions and Answers

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. What was the current role and responsibilities
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Q2. Technical knowledge on ticketing tools
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Q1. Knowledge on GxP environment
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The interview session took 30 minutes

Q1. Implement java code to filter given data from a list using the Java Stream API
Ans. 
Implement Java code to filter data from a list using Java Stream API
• Use Stream.filter() method to filter data based on a given condition

• Use lambda expressions to define the filtering condition

• Collect the filtered data using Collectors.toList() method
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Q1. How did you handle conflicts in the team?
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Aptitude is easy and if your basics are strong

Coding round has 2 parts realtime coding and coding

Q1. Asked about projects
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Q2. Asked about oop concept
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Q1. Explain control statements? It is used to control the flow of execution of the program. We have two types they are Branching statements and Looping statements. Branching statements: these are used to branc...read more
Ans. 
Control statements are used to control the flow of execution of a program. They include branching and looping statements.
• Branching statements are used to execute a particular set of statements and include simple if, if else, nested if else, else if ladder, and switch.

• Looping statements are used to execute a set of instructions repeatedly and include for loop, while loop, and do while.

• Control statements are essential fo...read more
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Q2. Explain inheritance? Fetching the properties of one class in a different class. It has various types they are ‘single level’, ‘multiple’, ‘multilevel’, ‘hierarchical’, ‘hybrid’.
Ans. 
Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.
• Inheritance allows code reusability and saves time and effort in writing new code.

• The existing class is called the parent or base class, and the new class is called the child or derived class.

• The child class inherits all the properties and methods of the parent class and can also add new ...read more
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Q1. Selenium and java .scenario based questions.
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OOPS , Data Structures