Dun & Bradstreet Senior Software Engineer and Lead Interview Questions and Answers

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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2 coding qns and aptitude

Q1. Question from resume, projects, SQL, OOPS
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Q2. Lambda function in python
Ans. 
Lambda function in Python is an anonymous function that can have any number of arguments, but can only have one expression.
• Lambda functions are defined using the lambda keyword.

• They are commonly used for small, one-time tasks.

• They can take any number of arguments, but can only have one expression.

• Example: lambda x: x*2 will return the double of x.
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Q1. Why do you want to work for this company
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Logical reasoning, grammar, and coding: two basic level questions.

Q1. Question on core Java
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Q2. Question on SQL and PLSQL
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Q3. Resume based question and on project
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Q1. Resume and project based question
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Q2. What do you like about your current company, and why do you want to join our organization?
Ans. 
I appreciate the collaborative team environment and innovative projects at my current company, and I am excited about the opportunities for growth and learning at your organization.
• Collaborative team environment fosters creativity and productivity

• Innovative projects challenge me to learn and grow

• Excited about the opportunities for growth and learning at your organization
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Q1. Questions on Core java, Spring boot and Angular (from resume profile)
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Q2. Discussion on Personal project
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Q1. Detailed Discussion on Current project, entire application workflow and design, implementations and questions like Why, What and How on the tools, technologies, approach and servers used.
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Q1. Question on familiarity with Agile
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Q2. What things a working day constitute of?
Ans. 
A working day for a software developer typically involves coding, debugging, attending meetings, collaborating with team members, and researching new technologies.
• Coding: Writing and testing code to develop software applications.

• Debugging: Identifying and fixing errors or bugs in the code.

• Meetings: Participating in team meetings to discuss project progress and updates.

• Collaboration: Working with team members to solve p...read more
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Pattern programming, javascriptt based questions

Q1. Browser specific questions
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Q1. ML Related question for backend Engineer
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