Dun & Bradstreet Data Engineer Interview Questions and Answers for Experienced

Q1. How would you write a REST API from scratch? Explain your role in the project.
Ans. 
To write a REST API from scratch, I would follow these steps:
• Define the resources and endpoints

• Choose a programming language and framework

• Implement CRUD operations for each resource

• Use HTTP methods and status codes correctly

• Add authentication and authorization

• Test the API using tools like Postman

• Document the API using tools like Swagger
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Q1. How can you explain your work experience and describe how you can contribute to the organization?
Ans. 
I have extensive experience in analyzing data to provide valuable insights and drive decision-making. I can contribute by leveraging my skills to improve processes and optimize performance.
• I have worked with various data analysis tools and techniques to extract, clean, and analyze data sets.

• I have experience in creating visualizations and reports to communicate findings to stakeholders.

• I have a track record of identify...read more
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Apptitude test happen in first go it was quite easy

GD happen between 10 group member we have speak for sometime

Q1. Question on OOPS
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Q2. Quesion on SQL and python
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In Mu Sigma APT round is divided into 3 sections Quant, Logical and verbal

Q1. Explain oops concept
Ans. 
OOP is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOP focuses on creating objects that interact with each other to solve problems.

• Key concepts include classes, objects, inheritance, polymorphism, and encapsulation.

• Classes are blueprints for creating objects, while objects are instances of classes.

• Inheritance allows a class to i...read more
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Coding was good and it was based on bubble sort