Experian Technical Architect Interview Questions and Answers

Q1. Recursion program
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Q2. System Design questions based on current project
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Q3. Micro service design patterns
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Micro service design patterns are architectural patterns used to design and implement microservices.
• Service discovery

• Circuit breaker

• API gateway

• Event sourcing

• Saga pattern
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Q1. Core Java - Intermediate level
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Q2. Basics of HTML and JAVASCRIPT
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Q1. Communication and about yourself.
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Q1. What is dependency injection?
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Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by mocking dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

• Example: Instead of a class creating an instance of another...read more
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Q2. What is app.use in .net core?
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app.use in .NET Core is used to add middleware to the request pipeline.
• app.use is a method used in ASP.NET Core to add middleware components to the request pipeline.

• Middleware components are software components that are executed in the request pipeline to handle requests and responses.

• Middleware components can perform tasks such as authentication, logging, error handling, and more.

• Example: app.use(new MiddlewareCompone
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Q3. What is difference between Interface and abstract class?
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Interface is a contract that defines the methods a class must implement, while abstract class can have both abstract and concrete methods.
• Interface cannot have any implementation, while abstract class can have both abstract and concrete methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstract classes are us...read more
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Q4. Boxing Unboxing
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Q5. ArrayList and List
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Q6. Can abstract class instantiated?
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No, abstract classes cannot be instantiated.
• Abstract classes are meant to be inherited and extended by other classes.

• Attempting to instantiate an abstract class will result in a compilation error.

• Abstract classes can have abstract methods that must be implemented by the subclass.
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Q7. How to optimize react application?
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Optimizing a React application involves code splitting, lazy loading, minimizing bundle size, using memoization, and optimizing render performance.
• Implement code splitting to load only necessary code for each route or component.

• Utilize lazy loading to defer loading of non-essential components until they are needed.

• Minimize bundle size by removing unused code, optimizing images, and using tree shaking.

• Use memoization te...read more
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Q8. Props destructuring?
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Q9. Parent child component communication in react?
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Parent child component communication in React involves passing data from parent to child components and triggering events from child to parent components.
• Use props to pass data from parent to child components

• Use callback functions to trigger events from child to parent components

• Context API can be used for passing data to deeply nested components
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Q10. What is useRef, useMemo, useCallback?
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useRef is used to persist a value across renders, useMemo is used to memoize expensive calculations, useCallback is used to memoize functions.
• useRef is commonly used to access DOM elements or persist values between renders.

• useMemo is used to memoize expensive calculations to avoid re-computation.

• useCallback is used to memoize functions to prevent unnecessary re-renders.

• Example: useRef can be used to store a reference t...read more
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2 programs on data structure

Q1. Questions on java and spring boot.
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Q1. What is your Expectatation
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My expectation is to lead a team of skilled professionals towards achieving the project goals and delivering high-quality products.
• To effectively communicate with team members and stakeholders

• To identify and mitigate risks

• To ensure adherence to project timelines and budgets

• To foster a culture of continuous improvement

• To provide mentorship and guidance to team members
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Q1. Tell me about yourself?
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Experienced technical lead with a strong background in software development and project management.
• Over 8 years of experience in leading technical teams and delivering successful projects

• Proficient in various programming languages such as Java, Python, and JavaScript

• Skilled in Agile methodologies and implementing best practices for software development

• Strong communication and leadership skills, able to collaborate effe
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Q1. COBOL functions.
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Q2. File Management
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Had to implement 2 medium questions. and give approach for 1 hard level questions. Basic questions around java were also asked.

Q1. Design system for gaming android app like ludo.
Ans. 
Design a system for a gaming android app like ludo.
• Implement game logic for ludo including dice rolling, moving pieces, and winning conditions.

• Create a user interface with a game board, player pieces, and dice.

• Incorporate multiplayer functionality for online play.

• Include features like in-game chat, leaderboards, and customizable game settings.

• Utilize a backend server to handle game synchronization and data storage.
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Q1. Reverse the given linked list
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Q2. Separate out 0's, 1's, and 2's in an array
Ans. 
Separate out 0's, 1's, and 2's in an array
• Create three variables to count the number of 0's, 1's, and 2's in the array

• Loop through the array and increment the respective variable for each occurrence

• Create a new array and add the counted number of 0's, 1's, and 2's in order
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Q1. Remove duplicates from the given array
Ans. 
Remove duplicates from given array of strings
• Create a new empty array

• Loop through the original array and check if the element already exists in the new array

• If not, add it to the new array

• Return the new array
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Q2. Detect a loop in linked list
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Loop in linked list can be detected using Floyd's cycle-finding algorithm.
• Floyd's cycle-finding algorithm uses two pointers, one moving at twice the speed of the other.

• If there is a loop, the faster pointer will eventually catch up to the slower pointer.

• If there is no loop, the faster pointer will reach the end of the list.

• Time complexity of this algorithm is O(n) and space complexity is O(1).
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