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Data structures related to dynamic program
React coding test . Design drop-down
Designing a recommendation system for YouTube
Utilize collaborative filtering to recommend videos based on user preferences
Incorporate content-based filtering to suggest videos similar to ones previously watched
Implement a hybrid approach combining collaborative and content-based filtering for more accurate recommendations
I applied via Referral and was interviewed in Feb 2024. There were 2 interview rounds.
Find duplicates in a array
A product array is an array of strings representing different products.
Each element in the array is a string representing a product
Example: ['iPhone', 'Samsung Galaxy', 'Google Pixel']
Can be used to store and manipulate a list of products
Search for a target value in a rotated sorted array using binary search
Find the pivot point where the array is rotated
Determine which half of the array the target value lies in
Perform binary search on the appropriate half of the array
I applied via Recruitment Consulltant and was interviewed before Aug 2023. There were 4 interview rounds.
DSA questions on graphs
Use synchronization mechanisms like locks or synchronized blocks to ensure only one thread can access the method at a time.
Use synchronized keyword in method signature
Use synchronized blocks inside the method
Use ReentrantLock for more fine-grained control
Paytm interview questions for designations
I applied via Referral and was interviewed before Aug 2023. There were 2 interview rounds.
Had to implement 2 medium questions. and give approach for 1 hard level questions. Basic questions around java were also asked.
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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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
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
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).
I applied via Referral and was interviewed in May 2024. There was 1 interview round.
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...
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
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...
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.
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...
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
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...
I have worked on AWS (Amazon Web Services) cloud platform.
Utilized various AWS services such as EC2, S3, RDS, and Lambda
Implemented infrastructure as code using CloudFormation
Managed security groups and IAM roles for access control
Optimized cost by utilizing spot instances and reserved instances
I applied via Company Website and was interviewed before Mar 2021. There were 4 interview rounds.
Hackerrank kind of coding test. 2 questions to resolved within 70mins.
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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