15 Best Project Ideas for Backend Development : 🛠️🌐

🚀 Beginner Level :

1. 📦 RESTful API for a To-Do App
2. 📝 Contact Form Backend
3. 🗂️ File Upload Service
4. 📬 Email Subnoscription Service
5. 🧾 Notes App Backend

🌟 Intermediate Level :
6. 🛒 E-commerce Backend with Cart & Orders
7. 🔐 Authentication System (JWT/OAuth)
8. 🧑‍🤝‍🧑 User Management API
9. 🧾 Invoice Generator API
10. 🧠 Blog CMS Backend

🌌 Advanced Level :
11. 🧠 AI Chatbot Backend Integration
12. 📈 Real-Time Stock Tracker using WebSockets
13. 🎧 Music Streaming Server
14. 💬 Real-Time Chat Server
15. ⚙️ Microservices Architecture for Large Apps

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5 frequently Asked SQL Interview Questions with Answers in Data Engineering interviews:
𝐃𝐢𝐟𝐟𝐢𝐜𝐮𝐥𝐭𝐲 - 𝐌𝐞𝐝𝐢𝐮𝐦

⚫️Determine the Top 5 Products with the Highest Revenue in Each Category.
Schema: Products (ProductID, Name, CategoryID), Sales (SaleID, ProductID, Amount)

WITH ProductRevenue AS (
SELECT p.ProductID,
p.Name,
p.CategoryID,
SUM(s.Amount) AS TotalRevenue,
RANK() OVER (PARTITION BY p.CategoryID ORDER BY SUM(s.Amount) DESC) AS RevenueRank
FROM Products p
JOIN Sales s ON p.ProductID = s.ProductID
GROUP BY p.ProductID, p.Name, p.CategoryID
)
SELECT ProductID, Name, CategoryID, TotalRevenue
FROM ProductRevenue
WHERE RevenueRank <= 5;

⚫️ Identify Employees with Increasing Sales for Four Consecutive Quarters.
Schema: Sales (EmployeeID, SaleDate, Amount)

WITH QuarterlySales AS (
SELECT EmployeeID,
DATE_TRUNC('quarter', SaleDate) AS Quarter,
SUM(Amount) AS QuarterlyAmount
FROM Sales
GROUP BY EmployeeID, DATE_TRUNC('quarter', SaleDate)
),
SalesTrend AS (
SELECT EmployeeID,
Quarter,
QuarterlyAmount,
LAG(QuarterlyAmount, 1) OVER (PARTITION BY EmployeeID ORDER BY Quarter) AS PrevQuarter1,
LAG(QuarterlyAmount, 2) OVER (PARTITION BY EmployeeID ORDER BY Quarter) AS PrevQuarter2,
LAG(QuarterlyAmount, 3) OVER (PARTITION BY EmployeeID ORDER BY Quarter) AS PrevQuarter3
FROM QuarterlySales
)
SELECT EmployeeID, Quarter, QuarterlyAmount
FROM SalesTrend
WHERE QuarterlyAmount > PrevQuarter1 AND PrevQuarter1 > PrevQuarter2 AND PrevQuarter2 > PrevQuarter3;

⚫️ List Customers Who Made Purchases in Each of the Last Three Years.
Schema: Orders (OrderID, CustomerID, OrderDate)

WITH YearlyOrders AS (
SELECT CustomerID,
EXTRACT(YEAR FROM OrderDate) AS OrderYear
FROM Orders
GROUP BY CustomerID, EXTRACT(YEAR FROM OrderDate)
),
RecentYears AS (
SELECT DISTINCT OrderYear
FROM Orders
WHERE OrderDate >= CURRENT_DATE - INTERVAL '3 years'
),
CustomerYearlyOrders AS (
SELECT CustomerID,
COUNT(DISTINCT OrderYear) AS YearCount
FROM YearlyOrders
WHERE OrderYear IN (SELECT OrderYear FROM RecentYears)
GROUP BY CustomerID
)
SELECT CustomerID
FROM CustomerYearlyOrders
WHERE YearCount = 3;


⚫️ Find the Third Lowest Price for Each Product Category.
Schema: Products (ProductID, Name, CategoryID, Price)

WITH RankedPrices AS (
SELECT CategoryID,
Price,
DENSE_RANK() OVER (PARTITION BY CategoryID ORDER BY Price ASC) AS PriceRank
FROM Products
)
SELECT CategoryID, Price
FROM RankedPrices
WHERE PriceRank = 3;

⚫️ Identify Products with Total Sales Exceeding a Specified Threshold Over the Last 30 Days.
Schema: Sales (SaleID, ProductID, SaleDate, Amount)

WITH RecentSales AS (
SELECT ProductID,
SUM(Amount) AS TotalSales
FROM Sales
WHERE SaleDate >= CURRENT_DATE - INTERVAL '30 days'
GROUP BY ProductID
)
SELECT ProductID, TotalSales
FROM RecentSales
WHERE TotalSales > 200;

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Hope it helps :)

MERN Stack Developer Roadmap 2025:

Steps:
1: 🌐 Master Web Basic
2: 🖥️ HTML/CSS
3: ✨ Deep Dive JavaScript
4: 🗂️ Version Control
5: 🐍 Node.js
6: 🗃️ Express.js
7: 📦 NPM
8: 📚 MongoDB
9: 🌟 React.js
10: 🔐 JWT
11: 🚀 App Deployment
12: 🐳 Docker Basics
13: ☁️ Explore Cloud Services
14: 🔄 CI/CD with GitHub Actions
15: 🧪 Testing with Jest
16: 📜 API Documentation
17: 📢 Build Portfolio
18: 💼 Resume Create
19: 🛑 Interview Preparation
Step 20: 🔍 Hunt Job

START Your MERN Journey

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5 Easy Projects to Build as a Beginner

(No AI degree needed. Just curiosity & coffee.)

❯ 1. Calculator App
 • Learn logic building
 • Try it in Python, JavaScript or C++
 • Bonus: Add GUI using Tkinter or HTML/CSS

❯ 2. Quiz App (with Score Tracker)
 • Build a fun MCQ quiz
 • Use basic conditions, loops, and arrays
 • Add a timer for extra challenge!

❯ 3. Rock, Paper, Scissors Game
 • Classic game using random choice
 • Great to practice conditions and user input
 • Optional: Add a scoreboard

❯ 4. Currency Converter
 • Convert from USD to INR, EUR, etc.
 • Use basic math or try fetching live rates via API
 • Build a mini web app for it!

❯ 5. To-Do List App
 • Create, read, update, delete tasks
 • Perfect for learning arrays and functions
 • Bonus: Add local storage (in JS) or file saving (in Python)


React with ❤️ for the source code

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