Prime Focus Technologies Software Engineer Interview Questions and Answers

Q1. My expertise are in golang. And all the questions were straight forward around golang.
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Q2. What is concurrency. How to check performance of applications. How to handle concurrency. How many no of goroutines can be created and so on.
Ans. 
Concurrency is the ability of a system to run multiple tasks simultaneously. Performance of applications can be checked using profiling tools. Concurrency can be handled using synchronization techniques like mutexes and channels.
• Concurrency allows multiple tasks to run concurrently, improving performance and responsiveness.

• Performance of applications can be checked using profiling tools like Go's built-in 'pprof' packa...read more
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Q1. How to make sure there are no vulnerabilities. What engineering principles you follow.
Ans. 
To ensure no vulnerabilities, follow secure coding practices, conduct regular security audits, use encryption, and stay updated on security threats.
• Follow secure coding practices such as input validation, output encoding, and parameterized queries.

• Conduct regular security audits to identify and address vulnerabilities in the code.

• Use encryption to protect sensitive data in transit and at rest.

• Stay updated on security t...read more
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Q1. Sorting of an array
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Q2. Bubble sorting algorithm
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Q1. Java oops question
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Q1. API questions related to put and patch api
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Q1. What is the design pattern? Singleton Design patter
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Used when only one instance of a class is needed throughout the system

• Provides a global access point to the instance

• Implemented by creating a static method to return the same instance each time it is called
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Q2. Difference Hashmap and Concurrent Hashmap
Ans. 
HashMap is not thread-safe, while ConcurrentHashMap allows multiple threads to read and write concurrently.
• HashMap is not synchronized and not thread-safe, while ConcurrentHashMap is synchronized and thread-safe.

• ConcurrentHashMap allows multiple threads to read and write concurrently without any external synchronization, while HashMap requires external synchronization for concurrent access.

• ConcurrentHashMap achieves hi...read more
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Q3. Collection Framework
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Q4. Difference between list , set
Ans. 
List is an ordered collection of elements with duplicates allowed, while set is an unordered collection of unique elements.
• List maintains the order of elements, while set does not guarantee any specific order.

• List allows duplicate elements, while set does not allow duplicates.

• Example: List - [1, 2, 3, 1], Set - {1, 2, 3}
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Q1. Questions on OOPS, Core Concepts of C#, SQL
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Q1. Questions on System Design and tricky questions on OOPS
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Q1. Previous organization work culture and expectations
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Create an API using Notepad to check if a string is a palindrome or not.

Q1. Solid principal
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Know your resume and your basics

Know class diagrams. Very Huge for workday.