Zepto Software Engineer III Interview Questions and Answers

Q1. What is event loop, how it works.
Ans. 
Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.
• Event loop is commonly used in JavaScript to handle asynchronous operations like setTimeout, setInterval, and AJAX requests.

• It works by continuously checking the event queue for any pending events, executing them one by one, and then moving on to the next event.

• Event loop helps in pre...read more
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Q2. Micro task queue and macro task queue.
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Q3. Is node.js single threaded or multi-threaded, also discuss threadpool and it's usages.
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Q4. Tell the order of output, among process, promise, setTimeout, fs, setInterval.
Ans. 
The order of output is fs, process, setTimeout, setInterval, promise.
• fs module is synchronous and will output first

• process is next in line

• setTimeout will be executed after process

• setInterval will be executed after setTimeout

• promise will be executed last
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Q1. JavaScript usages compiler or interpreter.
Ans. 
JavaScript is an interpreted language.
• JavaScript is an interpreted language, meaning it is executed line by line at runtime.

• There is no separate compilation step in JavaScript like in languages that use compilers.

• Examples of interpreted languages include Python, Ruby, and PHP.
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Q2. Tell the output among various for loops using var, let and bind.
Ans. 
Output comparison of for loops using var, let, and bind in JavaScript.
• Using var: variable is function-scoped, may lead to unexpected behavior in loops.

• Using let: variable is block-scoped, recommended for loop iterations.

• Using bind: creates a new function with a specified 'this' value and initial arguments.
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Q3. A medium level dsa question on array, solved it using pre-sum.
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Q4. Situation based question, on how to pick a suitable database.
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Q1. What do you do on daily basis, and how to decide a tech-stack on high level.
Ans. 
I work on coding, debugging, testing, and collaborating with team members. Tech stack decisions are based on project requirements, scalability, performance, and team expertise.
• Daily tasks include coding, debugging, testing, and collaborating with team members

• Tech stack decisions are based on project requirements, scalability, performance, and team expertise

• Consider factors like language compatibility, libraries/framewo...read more
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Q2. Design an online scalable, real-time document sharing application like google docs.
Ans. 
Design a scalable, real-time document sharing app like Google Docs.
• Use websockets for real-time collaboration

• Implement version control to track changes

• Utilize a distributed database for scalability

• Include user authentication and access control

• Support offline editing with automatic sync
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Q3. How to handle images also in the future.
Ans. 
Utilize cloud storage for scalability, implement image compression techniques, and regularly update image processing libraries.
• Utilize cloud storage for scalability

• Implement image compression techniques

• Regularly update image processing libraries
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Q4. Any other way to solve the problem, of high I/O on same document to overcome throughput and conflicts.
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Questions were crayon box ,the bot and the game and happy neighbourhood for 90 mins

Q1. Array basics was asked
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Q2. Segment tree,prefix sum
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Q1. Low level design was asked
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3 questions easy-medium level leetcode problem I solved 2 completely and 3rd question partially (9/15 test cases passed) to move on to 2nd round

Q1. Implement an app similar to splitwise
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Q1. Golang specific question regarding worker pool implementation
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Q1. He asked to invert a binary tree
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Q2. Deep dive in projects
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Q3. Asked me indept js questions
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DSA Problems from leetcode

Q1. Basics about Android and iOS
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So after Resume shortlisting you have Round 1 as Programming Test (60%) & Aptitude Test (40%) in which you will be asked 15 aptitude questions and 2 DSA problems. You will get 1 hour to write the test.
DSA problems:
1. Merge 2 sorted arrays
2. find the target sum in given array and return their indexes

Q1. If you clear Round 1 then you will go forward to Round 2 which is one-to-one technical round. In this round you will be asked leetcode problems and some conceptual questions. I was asked to Find the Max su...read more
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Q2. Length of Longest Substring with distinct character
Ans. 
Find the length of the longest substring with distinct characters in a given string.
• Use a sliding window approach to keep track of the current substring.

• Maintain a set to store the distinct characters in the current substring.

• Update the maximum length of the substring whenever a longer substring is found.
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Q3. Find Max sum of subarray.
Ans. 
The maximum sum of a subarray is to be found.
• Use Kadane's algorithm to find the maximum sum of a subarray.

• Initialize two variables: maxSum and currentSum.

• Iterate through the array and update currentSum by adding the current element.

• If currentSum becomes negative, reset it to 0.

• If currentSum is greater than maxSum, update maxSum.

• Return maxSum as the maximum sum of a subarray.
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Q1. Last round was Head of engineering round in this you will be asked some technical questions like: Apply Merge sort on a Linked List
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Q2. 25 Horses: Google interview problem
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