Zopper Senior Software Developer Interview Questions and Answers

There were 3 question from DSA: 1st and 2nd was from recession and Dp and last one was from graph.

Tree based coding problem

Q1. Multithreading and locking mechanism
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Q2. Reverse Linked list code
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Q1. Why do you want to join Greyorange
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Q1. Design a multithreaded logger system
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A multithreaded logger system allows multiple threads to log messages concurrently without blocking each other.
• Use a thread-safe data structure like a concurrent queue to store log messages.

• Implement a logging class with methods for adding log messages and writing them to a file.

• Use synchronization mechanisms like locks or semaphores to ensure thread safety.

• Consider using a separate thread for writing log messages to t...read more
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Q2. How virtual pointers work?
Ans. 
Virtual pointers are used in C++ to implement polymorphism by allowing objects to be accessed through a base class pointer.
• Virtual pointers are used in C++ to achieve runtime polymorphism.

• They are created by adding virtual keyword to a function in a base class.

• Virtual pointers allow objects of derived classes to be accessed through a base class pointer.
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Q1. Basic to intermediate.net, EF, SQL, C#, OOP
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Q2. Basics of .Net Core
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Q1. Deep into.net and sql
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Java internals, coding questions 2sum

Q1. Hld of your previous project
Ans. 
Developed a web-based project management tool for tracking tasks and deadlines.
• Used React.js for front-end development

• Implemented RESTful APIs for backend using Node.js and Express

• Utilized MongoDB for database storage

• Incorporated authentication and authorization features for user security
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Q2. Question related to self build projects
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Q1. Salary negotiation
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Q2. Location constrain if any
Ans. 
Open to relocation for the right opportunity
• Willing to relocate for the right job opportunity

• Flexible with location for the right role

• Open to considering different locations for the right position
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Please inquire about the fundamentals of computer science, including object-oriented programming, data structures and algorithms, database management systems, and computer networks.

Three coding problems were asked one was to print frequency of each character in a string, second was also similar to this problem unable to recall it and third problem was given an array of string and range from L to R find the nth character if all strings from L to R is concatenated and sorted. Apart from these three coding problems there were 10 easy MCQ's.

Q1. Basic questions on java and spring boot, annotations, oops concept.
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Q2. Code LRU cache(with no updates), just to implement push and pop operation with given window size of 4.
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Q1. It was a design round where I was asked to write class models of a in memory session management system without using tools like redis.
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Q1. Move negative elements to right side of array
Ans. 
Move negative elements to right side of array
• Iterate through the array and swap negative elements to the right side

• Use two pointers approach to keep track of positive and negative elements

• Maintain the order of elements while moving negatives to the right side
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