Meritto Senior Software Engineer Interview Questions and Answers

Q1. Internal Working Of Hashmap, Java 8 features and two DSA questions one was based on the array and the second one was based on LinkedList. The first interview round was very excellent that's why they conduc...read more
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Q2. Detect loop in a LinkedList,
Ans. 
Detect loop in a LinkedList
• Use 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 one

• If there is no loop, the faster pointer will reach the end of the list
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Q1. System Design HLD and LLD round which was the final round.
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Q2. HLD and LLD Designing round: Desing Architecture for ChatBot and Company Employee Data Management System.
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Q1. Basic js question closure, async defer and all
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Q2. Create autosuggest debounce, pollyfill
Ans. 
Autosuggest debounce is a feature that delays the search suggestions until the user stops typing, and a polyfill is a piece of code that provides functionality that is not natively supported by the browser.
• Implement a debounce function to delay the autosuggest feature until the user stops typing.

• Use a polyfill to provide support for the autosuggest feature in browsers that do not natively support it.

• Example: Implement ...read more
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Q1. A programming question
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Q2. React-native architecture and flatlist
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Q3. Kadanes algorithm
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Kadane's algorithm is used to find the maximum subarray sum in an array of integers.
• Iterate through the array and keep track of the maximum sum ending at each index.

• At each index, choose between extending the previous subarray or starting a new subarray.

• Example: For array [-2, 1, -3, 4, -1, 2, 1, -5, 4], the maximum subarray sum is 6 (from index 3 to 6).
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Q4. Scalablity, performance
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Q1. Android activity lifecycle
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Q2. Android MVVM architecture
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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
Ans. 
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.
Ans. 
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
Ans. 
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
Ans. 
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. Create useDebounce hook
Ans. 
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
Ans. 
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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Moving 0's in matrix
graph based question

Array based question

Q1. Basic questions about project and work experience
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