MERN-Interview-Questions

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MERN-Interview-Questions

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⭐ @2023 Version
### In all my interviews two questions were constant- 
1. Tell me about yourself
2. What are your projects? and Explain one of them (in technical depth)
3. (at end) Any questions from your side?

### AdmitKard (7-10LPA) - 2 Rounds
1️⃣ First round (cleared)

- var vs let,
- hoisting,
- closure,
- named vs self functions,
- generator functions,
- promises, vs to asynchronous modification, 
- Event loop + JS working process,
- 2-3 tricky mongo Query(find second oldest student),
- setTimeout tricky question + how to fix (with closures),
- IIFE

2️⃣ Second round (70%)

- My projects related (interested in socket.io events)
- Authentication vs Authorization + Implement,
- My AWS S3 bucket usage basics,
- I had to elaborate my Keyhasher npm package basics,
- Modified binary search based DSA,
- implement stack with arr, and find max without loop DSA with JS,
- Hoisting,
- Closures,
- Shallow copy, deep copy (spread op can't do deep copy, how to do it manually),
- using Object.entries clone nested obj to nested arr (I mentioned Object.entries in prev qs),
- Typescript basics + pros and cons
- React lifecycle in both class and function based
- Prototype (Implement a custom function on Array using prototype)

❌ Missed:

- Prototype implementation (theoretically explained)
- Custom stack implementation asked to do in C++, couldn't do in JS
- 0(1) in modified BS
- spread op {... obj} only copies first level key values (swallow), missed there

Feedback:
- You have good knowledge, practice more in depth
----------------------------------------------------------------------

### TestBook.com (4.5-5.5LPA) - 3 Rounds (offered MERN Stack Strategist role)

1️⃣ First round (cleared)
- var vs let vs const,
- Showed a snippet asked explanation (for loop with var i = 0, ...)
- asked to explain a project

2️⃣ First round (cleared)
- var vs let vs const,
- Closures
- how can you contribute to testBook with your skills
- You're from ECE, how web development caught your attention

3️⃣ Third round (cleared)
- var vs let vs const, (same thrice🙂)
- Hoisting
- Closures and implement
- Where you see yourself in future
- (follow up) If you Love technology that much, why TestBook? why not any purely dev based role
- Revenue vs profit
- Let's say you have Book store, what steps you can take to increase your profit (don't include online methods)

Feedback:
- Great, offer received, couldn't join in Navi Mumbai for college
----------------------------------------------------------------------

### Dhan.ai - 2 Rounds (Offered 4LPA Remote)

1️⃣ First round (cleared)
- Screening exam on DSA (3-4 easy to medium Qs)

2️⃣ Second round (cleared)
- Basic JS based DSA,
- == vs ===
- implement map in JS to find occurrence of char,
- Sliding window algorithm with complex modification (find a range) // and also random combination where sliding window won't work,
- Personal software development experience

Feedback:
- Don't get distracted for nervousness
----------------------------------------------------------------------

3️⃣ Third round (cleared)
- What is TypeFinance project, how it's scalable, stack and use cases
- Explain LMS project
- Explain keyhasher
- Write a query to find availability of array of names in MongoDB ($in query)
- FS module, with customization like directly return data, convert readFile callback to promises ( got stuck as .then was showing undefined)
- What are the advantages of TypeScript
- What's migration in NodeJS
- create couple of Mongoose models and establish connection between them
- Basic express server + Mongo query to find user enrolled courses ( schema didn't had proper ref so couldn't populate)
- Asked ER Model, one to one, many to many
- Why you're using MongoDB over SQL in Projects
- Asked me to study and implement a crud application using SQL + ?typescript in a week and then drop email for next round, to evaluate how fast can I learn it.

FeedBack: 
- Will let you know, next day got remote offer
----------------------------------------------------------------------

### Antares Tech - 2 Rounds (progress)
1️⃣ First Telephonic round (cleared)

- Personal Projects 
- Interested fields in tech
- Why you like web development
- Good signs of a Software developer
- Basic of WebRTC (jd related to that)

2️⃣ Second round (progress)

- My personal projects
- Explain System design intuition behind my LMS app
- If In your LMS webapp, 100 users uploads 300mb files, how to handle that, give me an idea,
- What if the video upload fails,
- Why not implement AWS upload directly from frontend without server using api (needs auth)
- If someone uploads malicious files, how you can validate them, thought process
- I see you're contributing to the tech community (meant I create Tech content), how you see yourself from this perspective
- Tell more about your hashing package on npm
- Give an idea on sha256 itself
- Create a sleep function so that sleep(5) will stop all the processes for 5 seconds (in JS)
- Promise discussion in Depth (with previous question's edge cases)
- JS Execution processes
- ACID Properties
- JOINS in SQL with examples
- How to implement JOINS in MongoDB
- Reverse a number and Check if bit is overflowed by limit while reversing, preferred not to use stl functions
- Puzzle 1: If 2 unUniform ropes, one burns in 1 hour another in 30minutes, how to know when it's 45 minutes
- Puzzle 2: 8 coins are there, one is less weighing, I have a Iron manual weighing scale, that balances. IIn how many moves can I find the less weighing coin?

Feedback:
- Work on basics more to stand out from crowd, Don't get disheartened, I once was at your position.
- Do not be ashamed to share your seemingly foolish thoughts, as they may hold great potential for innovation and be exactly what is required.

----------------------------------------------------------------------

### Myways.ai - 2 Rounds (progress)

1️⃣ Screening exam
- 40 Nodejs and ReactJS questions (35 minutes | easy to medium)

2️⃣ Second round (cleared)
- Introduction
- Basics of ReactJS
- Implement a form that takes input a number and fetches a specific post with the number as id from backend and hides the form once data is shown. It was just a simple 20 minutes round.

3️⃣ Third round (cleared - External interviewer)
- Tell me about yourself
- What are you major projects in MERN Stack
- Are you familiar with any other stack on development level?
- Solve: Given an array consisting of 2n elements in the form [x1, x2, ..., xn, y1, y2, ..., yn]. Shuffle the array in form of [x1, y1, x2, y2, ... , xn, yn].
- Slice vs Splice
- Open codesandbox and Implement Reactjs timer with start, stop, resume, pause functionliaties.
- How will you use JWT in authentication
- Where accessToken comes into play in this
- How are you planning to do the authentication from frontend
- How will you design a system where (having three roles, admin, mod, user) Moderator wants to add a meeting in a portal.
- About mongoDB
- What are the best SEO practices you follow
- What libraries have you used with ReactJS
- Do you prefer normal CSS or anything else
- Why do you like tailwindCSS?
- Flexbox or grid, which one you mostly use? why not grid?
- How to center using flexbox, what if I do alignItems: end, difference between justify evenly and justify around
- What do you use for state management
- Basic SQL Query to update a user based on a condition

Feedback:
- While writing code, express your thought process to the interviewer.

4️⃣ Fourth round ( behalf of company named Atrina)
- Explained all my projects one by one

5️⃣ Fifth Round ( HR )
- My experience in Development 
- Can I relocate to a new city
- Am I comfortable with all the conditions
- Other necessary questions

Feedback:
I got offer, and I'm joining the Atrina
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