QualMinds Data Engineer Interview Questions and Answers

Q1. What is a pointer to pointer
Ans. 
A pointer to pointer is a variable that stores the memory address of another pointer variable.
• It is used to create dynamic data structures like linked lists and trees.

• It allows multiple levels of indirection.

• It is denoted by ** in C and C++.

• Example: int **ptr;

• Example: ptr = &p; where p is a pointer variable.
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Q2. Class, object, inheritance, polymorphism,dbms
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Q1. What experience do you have in this role?
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Q2. What tools or technologies are you comfortable using?
Ans. 
I am proficient in various data analysis tools, including Excel, SQL, Python, and visualization software like Tableau.
• Excel: Advanced functions, pivot tables, and data visualization.

• SQL: Writing complex queries for data extraction and manipulation.

• Python: Utilizing libraries like Pandas and NumPy for data analysis.

• Tableau: Creating interactive dashboards for data visualization.

• R: Statistical analysis and data visualiza
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Python, Pyspark, Scala, Kafka

Q1. CTE Expectation
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Design a web page with database connectivity

Q1. Describe your projects
Ans. 
Developed a web-based project management tool for a startup
• Used React for the frontend and Node.js for the backend

• Implemented user authentication and authorization using JWT

• Integrated with Trello API for task management

• Deployed on AWS EC2 instance with Nginx as reverse proxy
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Q1. Basic hr question
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Quant questions, you will be able to clear it easily

Task1: create a website with 3 wepages

task2: create custom linux commands

There are Question based on data strcuture ,they cover all the topic in ds

In coding code they gave internet access to solve the problem after 30 they told us to make some changes in it and we should ready to explain the entire code