PropTiger.com Software Developer Interview Questions and Answers

Round duration - 45 Minutes
Round difficulty - Medium

It was in the mid day and since I applied for a Frontend role the discussion was majorly around data structure and bit of Javascript.
The interviewer was helping and good listener.

Q1. 
Merge Two Sorted Linked Lists Problem Statement
You are provided with two sorted linked lists. Your task is to merge them into a single sorted linked list and return the head of the combined linked list.
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
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Round duration - 60 Minutes
Round difficulty - Medium

It was more of a in depth round on the framework I'm working on and problem solving.

Q1. What is the event loop and what is its significance?
Ans. 
The event loop is a mechanism in programming that allows for asynchronous execution of code.
• The event loop is a key component in JavaScript's runtime environment, responsible for handling asynchronous operations.

• It continuously checks the call stack for any pending tasks and executes them in a non-blocking manner.

• The event loop ensures that the program remains responsive by allowing other code to run while waiting for ...read more
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Q2. Can you provide examples of output-based questions in JavaScript that utilize browser APIs?
Ans. 
Output-based questions in JavaScript using browser APIs
• Example 1: Write a script that uses the Geolocation API to display the user's current location on a map

• Example 2: Create a program that uses the Web Audio API to play a sound when a button is clicked

• Example 3: Develop a web page that uses the Canvas API to draw a simple animation
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Q3. How would you design a system to support localization in a mobile app?
Ans. 
Designing a system to support localization in a mobile app
• Use resource files to store localized strings for different languages

• Implement a language selection feature for users to choose their preferred language

• Utilize localization libraries or frameworks to streamline the process

• Consider cultural differences when localizing content, such as date formats and currency symbols
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Round duration - 75 Minutes
Round difficulty - Hard

It was more of a fitment/managerial round.
Didn't had any coding questions, but was asked more on approaches and optimisations.
Discussions on the project you have worked on.

Q1. You need to find the fastest 3 horses out of a group, given that you can only race 5 horses at a time. How would you approach this problem?
Ans. 
To find the fastest 3 horses out of a group with 5 horses racing at a time, we can use a tournament style approach.
• Divide the horses into groups of 5 and race them against each other. This will give you the fastest horse in each group.

• Take the winners from each group and race them against each other. The top 3 horses in this final race will be the fastest 3 overall.

• Keep track of the results and compare the timings to d...read more
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Q2. How do you debug the root cause of lag on a screen?
Ans. 
To debug lag on a screen, analyze code, check for memory leaks, optimize rendering, and use profiling tools.
• Analyze code to identify any inefficient algorithms or operations causing lag.

• Check for memory leaks that could be impacting performance.

• Optimize rendering by reducing the number of draw calls, optimizing shaders, and minimizing overdraw.

• Use profiling tools like Xcode Instruments or Android Profiler to identify p...read more
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Q3. Can you explain the architecture of the app you have recently worked on?
Ans. 
The app I recently worked on is a social media platform for sharing photos and connecting with friends.
• The app follows a client-server architecture, with the client being the mobile app and the server handling data storage and processing.

• The client side is built using React Native for cross-platform compatibility.

• The server side is implemented using Node.js with a MongoDB database for storing user data and photos.

• The a...read more
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Q1. Implementation of LRU cache
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Q2. Implementation of HashMap
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Dsa question based on dp

Q1. Implement an immutable class.
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Q2. Implement a springboot service that intercepts http requests.
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Q1. Implement api call
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Q2. Implement frontend design
Ans. 
Implementing frontend design involves creating user interfaces using HTML, CSS, and JavaScript for web applications.
• Use HTML for structure: Create semantic elements like <header>, <nav>, <main>, and <footer>.

• Style with CSS: Apply styles using classes and IDs, and consider responsive design with media queries.

• Enhance interactivity with JavaScript: Use DOM manipulation to create dynamic content an...read more
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3 Moderate questions were asked. I managed to solve 2 completely and 1 partially.

Q1. Question related to system design were asked.
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Q2. He asked me to design some functions of facebook.
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Q1. Introduction type questions were asked. In this it will prefer only CS students
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Q1. Ask to find out count occurrences of anagram
Ans. 
Count occurrences of anagrams in an array of strings by grouping them based on sorted character sequences.
• Anagrams are words formed by rearranging the letters of another, e.g., 'listen' and 'silent'.

• To count anagrams, sort each string and use a hashmap to group them.

• Example: For ['eat', 'tea', 'tan', 'ate', 'nat', 'bat'], 'eat', 'tea', and 'ate' are anagrams.

• The output would be: {'eat': 3, 'tan': 2, 'bat': 1}.
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Q1. Nodejs life cycle
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Q2. Promise in nodejs
Ans. 
Promise in Node.js is an object representing the eventual completion or failure of an asynchronous operation.
• Used to handle asynchronous operations in a more readable and manageable way

• Can be in one of three states: pending, fulfilled, or rejected

• Can be chained together to handle multiple asynchronous operations sequentially

• Example: fetching data from a database using a promise-based API
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