FirstCry Data Science Engineer Interview Questions and Answers

I was asked question on sliding window on finding the largest subarray with all distinct numbers. The interviewer was very helpful.

Q1. Create pagination component using an api show the data for the pages
Ans. 
Create a pagination component using an API to display data for different pages.
• Use API to fetch data for each page

• Implement pagination logic to display data for each page

• Allow users to navigate between pages
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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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Q1. Create a controller , service and repository methods and classes to save userDeatils in table using Spring Data JPA .
Ans. 
Create a controller, service, and repository to save user details using Spring Data JPA.
• Create a UserController class with appropriate mappings for saving user details.

• Create a UserService class with a method to save user details.

• Create a UserRepository interface that extends JpaRepository to handle database operations.

• Implement the saveUserDetails method in the UserService class to call the save method of the UserRepo...read more
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First round was coding test in online mode which was quite easy.

Q1. In the 2nd round they asked the technical questions from SQL , simple coding questions.
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4 question were there i have completed all the problems in given time

Q1. Cab management sysntem
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Coding test on Hackerrank with easy to medium, well-known problems.

Q1. Basic DS and algo problems
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Q2. Basic DS & algo problems
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Q3. Data structures and algo
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Q4. That was it, only coding problems
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Q1. This one was more around CS fundamentals
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Q2. And then some random problems based on my expertise mentioned in the resume
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Q3. And some HR type problems
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Q4. Why you want to join Myntra
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Q5. Where do you see yourself in 5 years from now
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Q6. Any questions I had for the interviewer
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Q1. This was a typical HR round
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Q2. Where did you intern?
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Q3. Did you have any other companies on campus?
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Q4. Did you get selected in other companies?
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Q5. Which company you wanted to join the most?
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Q6. It wasn't Myntra so he asked why Myntra?
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Q7. Random question - backend or frontend?
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Q8. One last question which was kind of technical, related to ML and AI (it was for an automated tool they were planning to build to automate the interviewing process)
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I was interviewed back in 2020 that time they had mettle test which consisted of 2 medium leetcode questions and 10 MCQ related to time complexity

Q1. Typical DSA questions, had to solve and explain on board
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Q2. DFS, tree, height depth diameter went in followups
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Q1. Again A DSA round started off with a DP question, discussion hashing inbetween and ended with a topological sort question
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Q1. Hiring manager technical round wanted we design a car selling app
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Q1. Behavioral questions
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