Paytm Senior Software Engineer Interview Questions, Process, and Tips

Q1. Rain water tapping problem
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Q2. I don't remember the second one
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Q1. Design patterns
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Q2. Entity Framework
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3 questions easy to medium level

Q1. 2 DSA questions
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Q1. Dsa questions , oops , dbms
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Q1. Basic discussion
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Q1. Create useDebounce hook
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Custom hook for debouncing user input in React applications
• Accepts a value and delay as arguments

• Uses useEffect to set a timeout to update the debounced value after the specified delay

• Returns the debounced value and a function to update the input value
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Q2. Create language change functionality using useContext and useReducer
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Implement language change functionality using useContext and useReducer
• Create a LanguageContext to store the current language state

• Use useReducer to handle state changes for language selection

• Dispatch actions to update the language state based on user selection
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Hackerrank Online Coding test. DSA Questions

Q1. Create Traffic Lights in react.js with lights changing color with time config
Ans. 
Create a traffic light simulation in react.js with changing colors based on time configuration.
• Use React state to manage the current color of the traffic light

• Set up a timer to change the color of the traffic light at specified intervals

• Use CSS to style the traffic light and different colors for each light
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Q2. Polyfills of map, reduce, call, apply
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Polyfills are used to provide fallback support for older browsers that do not support certain JavaScript methods like map, reduce, call, and apply.
• Polyfills are JavaScript code that replicate the functionality of newer features in older browsers.

• They are commonly used for methods like map, reduce, call, and apply which may not be supported in all browsers.

• For example, a polyfill for the map method would involve iterati...read more
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Q3. Other Javascript concept questions like closures, teporal dead zone, let const var difference, arrow function vs normal function
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Q1. Web app Optimization Techniques
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Web app optimization techniques focus on improving performance and user experience.
• Minify and compress CSS, JavaScript, and HTML files

• Optimize images and use lazy loading

• Reduce server response time by caching data and using CDNs

• Implement asynchronous loading for non-essential resources

• Use browser caching and enable Gzip compression
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Q2. Javascript optimzation tehniques
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Q3. Infinite scroll - how to handle large size data, efficient and smooth loading by scrolling up & down.
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To handle large size data for infinite scroll, use virtual scrolling, lazy loading, and optimize data fetching/rendering.
• Implement virtual scrolling to render only the visible items on the screen, reducing memory usage and improving performance.

• Use lazy loading to fetch more data as the user scrolls, avoiding loading all data at once.

• Optimize data fetching and rendering by using efficient algorithms and data structures...read more
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Q4. Serverside vs clientside rendering
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Serverside rendering is when the HTML is generated on the server before being sent to the client, while clientside rendering is when the HTML is generated on the client's browser using JavaScript.
• Serverside rendering is better for SEO as search engines can easily crawl the content.

• Clientside rendering can provide a faster initial load time as only data is sent from the server.

• Serverside rendering is more secure as sens...read more
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Q5. Microservices vs Monolithic architecture
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Microservices allow for modular and scalable architecture, while monolithic architecture is simpler but less flexible.
• Microservices break down applications into smaller, independent services that communicate through APIs.

• Monolithic architecture involves building the entire application as a single unit, making it easier to develop but harder to scale.

• Microservices offer better fault isolation and scalability, while mono...read more
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Q6. How to acheive responsive acrooss all screen sizes
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Achieve responsive design by using media queries, flexible layouts, and fluid grids.
• Use media queries to adjust styles based on screen size

• Create flexible layouts that adapt to different screen sizes

• Implement fluid grids to ensure content scales proportionally
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Q1. Salary discussion
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Q1. Programing question project details java8
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Q2. Java 8 new added features
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Java 8 introduced several new features including lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Streams provide a new way to work with collections in a functional style.

• Functional interfaces are interfaces with a single abstract method, enabling the use of lambda expressions.

• Default methods allow interfaces to have me...read more
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Some mcq questions on Java and 2 DSA medium questions

Q1. Spring boot , Java and DSA questions
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Q1. Design BookMyShow low level design
Ans. 
BookMyShow low level design for ticket booking system
• Use microservices architecture for scalability and flexibility

• Implement user authentication and authorization for secure transactions

• Utilize databases for storing user and event information

• Include payment gateway integration for seamless transactions
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Q1. Design lru cache and code
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LRU cache is a data structure that stores a fixed number of items and removes the least recently used item when the cache is full.
• Use a combination of a doubly linked list and a hashmap to implement the LRU cache.

• When an item is accessed, move it to the front of the linked list to mark it as the most recently used item.

• When adding a new item, check if the cache is full. If it is full, remove the least recently used ite...read more
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