Dell EMC Senior Software Engineer Interview Questions and Answers

Q1. How to check a number is power of 2
Ans. 
To check if a number is a power of 2, we can use bitwise operations.
• A power of 2 has only one bit set to 1, so we can use the bitwise AND operator to check if the number is a power of 2.

• If n is a power of 2, then n & (n-1) will be 0.

• For example, 8 (1000 in binary) is a power of 2, and 8 & 7 (0111 in binary) is 0.
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Q2. Sort a stack without using another data structure
Ans. 
Sort a stack without using another data structure
• Use recursion to pop the top element and insert it at the bottom of the remaining stack

• Repeat until the stack is sorted in ascending order

• Time complexity: O(n^2), space complexity: O(n) due to recursion
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Q3. Check weather array have continuous increasing than decreasing value
Ans. 
Check if array has continuous increasing and decreasing values
• Loop through the array and check if each element is greater than the previous one

• Once you find the maximum element, check if the remaining elements are in decreasing order

• If yes, return true else false
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Q1. Design a cricinfo (LLD)
Ans. 
Design a cricinfo (LLD)
• Identify the entities: players, teams, matches, scorecards, tournaments, etc.

• Define the relationships between entities

• Create a database schema to store the data

• Implement APIs to fetch and update data

• Design a UI to display the information

• Consider scalability and performance

• Ensure data security and privacy
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Q1. Share details of your previous job.
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Q2. Why should we hire you?
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Q3. What are your strengths and weaknesses?
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Hacker rank coding test- It was an hour test. We need to optimize the code to run in the specific time limit

Q1. Implement Hashmap- Complete understanding of add, remove methods
Ans. 
Hashmap implementation with add and remove methods
• Hashmap is a data structure that stores key-value pairs

• Add method adds a key-value pair to the hashmap

• Remove method removes a key-value pair from the hashmap

• Hash collision can occur when two keys have the same hash value

• In case of collision, separate chaining or open addressing can be used
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Q2. Design elevators - How would you design how elevators work. How do you add different roles etc.
Ans. 
Designing elevators and adding different roles.
• Design a system that can handle multiple elevators and floors

• Implement a scheduling algorithm to optimize elevator usage

• Add roles such as maintenance, emergency, and security

• Incorporate safety features such as emergency stop buttons and sensors

• Consider accessibility for individuals with disabilities
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Q1. Question related to my current work.
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Q1. Design Memory Management system
Ans. 
Design a memory management system for efficient allocation and deallocation of memory in software applications.
• Implement a memory pool to pre-allocate a fixed amount of memory for frequent allocation and deallocation operations.

• Use garbage collection to automatically reclaim memory that is no longer in use.

• Implement memory segmentation to divide memory into different segments for better organization and management.

• Use ...read more
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Q1. OS basics, locking mechanism, etc
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Find range of numbers in an infinite array

Design a tree view for mobile with infinite nodes and collapsible using react-native

Q1. Discussion about my project and related questions
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Q2. Explain the tech stack, pros and cons
Ans. 
The tech stack includes Java, Spring Boot, React, and MySQL. Pros include robustness and scalability, cons include potential performance issues.
• Tech stack: Java, Spring Boot, React, MySQL

• Pros: Robustness, scalability

• Cons: Potential performance issues
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