Dun & Bradstreet Senior Software Engineer Interview Questions and Answers

Java coding questions, basic Java questions.

Q1. Java basics questions.
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Q2. Live coding.
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Q1. Discussion on previous experience and projects.
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Q2. System design question
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Q1. Questions on SQL, Java advanced, personal projects, Java frameworks, UI based questions, Agile methodologies.
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Q2. Interview discussion with the whole team.
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Q1. Benefits discussion.
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Q2. Salary discussion.
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Q1. Moderate questions
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Q2. Asynchronous coding, async, mvc, sql, missing number program
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Q1. Sql query on joins Given two tables and create output result . It was self join
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Q2. Oops polymorphism questions Microservices Design pattern Factory pattern
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Q1. Write progrem to check balenced brackets in a given string
Ans. 
Program to check balanced brackets in a given string
• Use a stack to keep track of opening brackets

• Iterate through the string and push opening brackets onto the stack

• When a closing bracket is encountered, pop from the stack and check if it matches the corresponding opening bracket

• If stack is empty at the end and all brackets are matched, the string is balanced
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Q1. Explain your previous projects
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Q2. Scenario based question
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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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