1. Can you briefly explain your project?

Food Delivery System (MERN Stack) – Ek online food ordering platform jisme 4 alag-alag users hain:

1. Admin – Restaurants ko manage/remove kar sakta hai aur platform ki earnings dekh sakta hai.
2. Restaurant – Apne menu items add/remove kar sakta hai aur earnings track kar sakta hai.
3. Delivery Partner – OTP dal kar order status ko delivered mark kar sakta hai.
4. User – Signup karke restaurants ka menu browse kar sakta hai, items cart me add kar sakta hai aur order place kar sakta hai.

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2. What was your role in the project?

Main full-stack developer tha, frontend aur backend dono par kaam kiya. API development, authentication, and UI designing me bhi contribute kiya.

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3. What motivated you to choose this project?

Aaj kal food delivery apps kaafi popular hain jaise Swiggy, Zomato, toh ek real-world scalable system banana tha jisme multiple users ho aur MERN stack ka practical implementation ho sake.

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4. What technologies, tools, or programming languages did you use?

• Frontend – React.js (UI ke liye), Tailwind CSS (styling ke liye)
• Backend – Node.js + Express.js (APIs ke liye)
• Database – MongoDB (NoSQL structure ke liye)
• Authentication – LocalStorage
• API Calls – Axios

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5. How did you plan and manage your project timeline?

Humne feature-wise development approach follow kiya:

1. Authentication aur dashboards setup karna
2. Restaurants ka menu system aur cart functionality
3. Order placement aur delivery OTP system
4. Testing aur performance optimizations

Trello aur Notion jaisi tools use ki planning ke liye.

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6. What were the main technical challenges you faced, and how did you overcome them?

• Authentication without bcrypt/sessions – Isko LocalStorage se manage kiya instead of JWT ya sessions.
• OTP validation – Order ke sath OTP generate kiya jo delivery partner verify karega.
• State Management – React me useState & useEffect ka sahi tarike se istemal kiya.

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7. Explain the architecture or design of your project.

MERN Stack architecture use kiya:

• Frontend – React for UI
• Backend – Node.js + Express.js for API
• Database – MongoDB (NoSQL ke benefits ke saath)
• Auth & API Calls – LocalStorage + Axios for smooth communication

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8. Why did you choose this specific technology stack?

MERN stack fast aur full-stack JavaScript environment provide karta hai, jisme frontend & backend ka same language me development ho sakta hai.

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9. How did you handle bugs and testing in your project?

• Console logs aur Postman ka use kiya API testing ke liye.
• Manual testing se UI aur functionality check ki.
• React Developer Tools aur Redux DevTools ka use kiya debugging ke liye.

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10. Can you walk me through a key piece of your code or algorithm?

OTP Verification logic:

1. Order ke saath ek OTP generate hota hai.
2. Delivery partner OTP enter karta hai.
3. Backend check karta hai ki OTP match ho raha hai ya nahi.
4. Agar match hota hai toh order delivered mark hota hai, warna error return hoti hai.

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11. Why did you choose this algorithm/technology over others?

Yeh approach simple, secure aur fast hai. Bcrypt/sessions ki jagah LocalStorage authentication liya taaki lightweight rahe.

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12. If you had more time, what improvements would you make?

• JWT-based authentication
• Real-time order tracking (WebSockets)
• Better UI/UX with animations

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13. How did you ensure the security and privacy of your project?

• MongoDB sanitization taaki NoSQL injection na ho.
• APIs pe role-based access control ensure kiya.
• Password encryption (Agar JWT implement hota).

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14. Did you consider scalability? If yes, how?

Haan, project scalable ho iske liye:

• Modular Code likha
• Indexing add ki queries fast karne ke liye
• API optimization ki taaki response time fast ho

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15. How did you handle conflicting ideas within your team?

Agar kisi feature ko lekar conflict hota toh discussion aur voting ke through best solution select kiya.

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16. Which frontend framework or library did you use (React, Angular, Vue)? Why?

React.js – Fast hai, component-based structure flexible hai, aur state management kaafi smooth hai.

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17. How did you handle state management in your project?

useState & useEffect hooks ka use kiya basic state ke liye.

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18. Can you explain the UI/UX decisions you made for your application?

• Simple navigation
• Minimal & clean UI
• Easy cart & checkout process

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19. How did you ensure responsiveness across different devices?

• Tailwind CSS ka use kiya jo mobile-first approach follow karta hai.
• Flexbox & Grid system ka use kiya UI ko adaptive banane ke liye.

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20. Did you use any CSS frameworks like Tailwind or Bootstrap? If yes, why?

Haan, Tailwind CSS use kiya kyunki yeh lightweight aur utility-first framework hai jo jaldi styling allow karta hai.

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21. Which database did you use (SQL, MongoDB)? Why?

MongoDB – NoSQL hone ki wajah se JSON-like structure easily handle hota hai, aur scalability ke liye best hai.

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22. How did you design your database schema?

Humne 4 main collections banayi:

1. Users – Name, email, password, role
2. Restaurants – Name, menu, orders
3. Orders – Items, status, OTP
4. Delivery Partners – Assigned orders, status

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23. Did you implement any indexing for faster queries?

Haan, _id aur restaurantID pe indexing add ki taaki queries fast ho sakein.

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24. How did you handle database transactions and rollback mechanisms?

• Agar multiple operations ek saath hone the toh MongoDB transactions ka use kiya taaki ek bhi fail ho toh rollback ho sake.

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25. Can you explain how you managed data consistency and integrity?

• Schema validation implement kiya backend pe.
• Error handling aur input validation add ki.

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26. How did you handle communication between frontend and backend?

Axios ke through frontend se backend ke endpoints pe API calls bheji.