Deloitte Consultant Interview Questions and Answers

Q1. Explain the structure of microservices architecture
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Q2. How to implement SQS and SNS in AWS cloud
Ans. 
Implementing SQS and SNS in AWS cloud involves creating queues and topics, setting up permissions, and configuring subscriptions.
• Create an SQS queue and configure its settings

• Create an SNS topic and configure its settings

• Set up permissions to allow SQS to send messages to SNS

• Configure subscriptions to connect the SQS queue to the SNS topic
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Q3. What are the things which we need to be aware before we start migrating monolith into microservices
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Considerations before migrating monolith into microservices
• Understand the current monolith architecture and dependencies

• Identify the boundaries for microservices and plan the decomposition

• Ensure proper testing and monitoring strategies are in place

• Address data management and consistency challenges

• Prepare for potential performance overhead and increased complexity
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Q4. How to provide security to apis without using spring security
Ans. 
Implement API security using token-based authentication and authorization
• Use token-based authentication like JWT (JSON Web Tokens)

• Implement custom authentication and authorization logic in the API endpoints

• Utilize API keys for access control and rate limiting

• Implement OAuth for secure authorization and delegation of access
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Q5. What is API gateway
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API gateway is a server that acts as an API front-end, receiving API requests, enforcing throttling and security policies, passing requests to the back-end service, and then passing the response back to the requester.
• API gateway acts as a single entry point for all API requests

• It can handle tasks like authentication, authorization, rate limiting, and caching

• Examples of API gateways include Amazon API Gateway, Apigee, a...read more
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Q1. Functional interface
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Q2. Object oriented concepts
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Q3. Stream api
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Q4. Synchronization
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Q5. While loop exceptions
Ans. 
While loop exceptions are errors that occur during the execution of a while loop.
• Common while loop exceptions include infinite loops, where the loop never terminates.

• Another exception is when the loop condition is never met, causing the loop to never execute.

• Handling exceptions in while loops can be done using try-catch blocks to catch and handle errors.
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Q1. Tell me about yourself
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Q2. Write program to check string is palindrom
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Q3. Write programm to Remove number from array who occur more than once
Ans. 
Program to remove duplicate numbers from array of strings
• Iterate through the array and keep track of the count of each number

• Remove numbers with count greater than 1 from the array
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Q4. String Buffer vs String Builder
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String Buffer is synchronized and thread-safe, while String Builder is not synchronized.
• String Buffer is slower due to synchronization, while String Builder is faster.

• String Builder should be used in single-threaded scenarios for better performance.

• String Buffer should be used in multi-threaded scenarios to ensure thread safety.
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Q5. If String s="Deloitte"; and String s2=new String("Deloitte"); what will be s1.equals(s2) and if(s1==s2)
Ans. 
s1.equals(s2) will return true as both strings have the same value. s1==s2 will return false as they are different objects.
• s1.equals(s2) compares the values of the strings, not the memory addresses

• s1==s2 compares the memory addresses of the strings, not their values

• Example: s1.equals(s2) will return true in this case because both s1 and s2 have the same value 'Deloitte'
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Q6. Why spring boot is better than spring ? Annotations of spring
Ans. 
Spring Boot is better than Spring because it simplifies the development process by providing out-of-the-box configurations and reducing boilerplate code.
• Spring Boot provides a pre-configured environment for application development, reducing the need for manual configurations.

• It includes embedded servers like Tomcat, Jetty, or Undertow, making it easier to deploy applications.

• Spring Boot auto-configures components based...read more
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Q7. Query for count employee in each department
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Query to count employees in each department
• Use SQL query with GROUP BY clause on department column

• Count the number of employees in each department

• Retrieve the department name and the count of employees
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Q8. How to create react app ? npm commands to create react app
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To create a React app using npm commands
• Use 'npx create-react-app my-app' to create a new React app

• Navigate into the newly created app directory using 'cd my-app'

• Start the development server with 'npm start'
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Q9. How routing works in react
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React routing allows for navigation between different components in a single-page application.
• React Router is a popular library for handling routing in React applications

• Routes are defined using <Route> components and nested within a <Router> component

• Navigation between routes is typically done using <Link> components or programmatic navigation with history object
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Q10. Dml dcl and ddl command
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Q1. Your surname? If you are a lala then surely selected
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Q2. What your father do? They just want to know if you can bring business to them
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Q1. About my Previous Job
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Q2. Compensation, Location, Project Details, Problem Solving
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IT is a secret, I can't open that

Q1. Why Consulting,
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Q2. About the assignment, location
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