Experian Technical Lead 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
Ans. 
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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First Round is Aptitude Round.
Second Round is technical inteview.
Third round is HR Round.

Q1. Rotate a array by D places.
Ans. 
Rotate an array of strings by D places.
• Create a temporary array to store elements that will be rotated

• Copy elements from original array to temporary array based on rotation

• Copy elements back from temporary array to original array
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Q2. Find Maximum in subarray
Ans. 
To find the maximum value in a subarray within an array of numbers.
• Iterate through the array and keep track of the maximum value seen so far.

• For each subarray, compare the maximum value with the current element and update if necessary.

• Return the maximum value found in the subarray.
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Q1. What is Your Strength and weakness Family background why do we hire you
Ans. 
My strength lies in my analytical skills and attention to detail, while my weakness is sometimes being too critical of my own work. I come from a supportive family background and believe my qualifications make me a strong candidate for this role.
• Strength: Analytical skills

• Strength: Attention to detail

• Weakness: Being too critical of my own work

• Family background: Supportive and encouraging

• Qualifications make me a strong
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Q1. What is dependency injection?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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?
Ans. 
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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Q1. Recursion program
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Q2. System Design questions based on current project
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Q3. Micro service design patterns
Ans. 
Micro service design patterns are architectural patterns used to design and implement microservices.
• Service discovery

• Circuit breaker

• API gateway

• Event sourcing

• Saga pattern
Answered by AI
Add your answer

Q1. Long running queries Blockings Backup Index HADR
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Q1. Data center migrations AG FLEXIBLE SHIFTS
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Q1. Package discussion Location Any offer
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Q1. Questions around http request response structure
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Q1. Salary expectation and Location preference
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Q1. Why do you want to work with IG
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Q1. PM knowledge area along with Agile
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PM budget and schedule

Q1. Singleton pattern... Oops concepts
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Q1. Only salary discussion
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