Zelis Associate Engineer Interview Questions and Answers

Math and verbal round .

General topics to speak

Q1. Duplicates in array College Projects Hashmap implementation
Ans. 
Implement a function to find duplicates in an array of strings using Hashmap.
• Create a Hashmap to store the frequency of each string in the array

• Iterate through the array and check if the frequency of any string is greater than 1

• If yes, add it to the list of duplicates

• Return the list of duplicates
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Q1. Linux basic questions
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Q1. Linux user related questions
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Q1. Explain your previous projects
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Q1. How did you integrate MongoDB with Python in your earlier project
Ans. 
I used PyMongo library to connect to MongoDB and perform CRUD operations in Python
• Installed PyMongo library using pip

• Created a MongoClient object to connect to the MongoDB server

• Accessed the database and collection using the MongoClient object

• Performed CRUD operations using the collection object

• Used pymongo.cursor.Cursor to iterate over the query results
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It was easy, just go through basic coding questions and you'll be good

Q1. Go through networking terms, OSI layer, TCP/IP, BIOS and system questions
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Q1. Solve Two sum problem
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Q2. What is threads?
Ans. 
Threads are lightweight processes within a program that can run concurrently, allowing for multitasking and improved performance.
• Threads share the same memory space within a process

• Threads can communicate with each other more easily than separate processes

• Examples include a web server handling multiple client requests concurrently
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Q1. Oops concepts Smart pointer C++11 related questions
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Q1. Java find errors in code
Ans. 
The Java code can be analyzed to find errors and bugs.
• Use a Java IDE or compiler to identify syntax errors.

• Debug the code to find logical errors and exceptions.

• Review the code for potential performance issues or code smells.

• Utilize code analysis tools like FindBugs or SonarQube for additional error detection.
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