diff --git a/web/Learning-Season/03-backend/challenges/solution/.gitignore b/web/Learning-Season/03-backend/challenges/solution/.gitignore
new file mode 100644
index 0000000..c74ff1b
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/.gitignore
@@ -0,0 +1,2 @@
+.env
+/node_modules
diff --git a/web/Learning-Season/03-backend/challenges/solution/README.md b/web/Learning-Season/03-backend/challenges/solution/README.md
new file mode 100644
index 0000000..5dcaa8c
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/README.md
@@ -0,0 +1,52 @@
+# 🌦 Weather CLI App
+
+A Node.js command-line application that fetches real-time weather data from the [OpenWeatherMap API](https://openweathermap.org/api) and displays it in the console.
+
+---
+
+## Features
+
+- Interactive city input — no flags or arguments required
+- Also supports CLI argument for scripted/automated use
+- Clean error handling for invalid cities, bad API keys, and network failures
+- Modular architecture: service layer, display layer, and entry point are fully separated
+- Secure API key management via environment variables
+
+---
+
+
+
+## Example Output
+
+```
+Enter city name: Alger
+Fetching weather data for Algiers...
+--------------------
+City: Algiers, DZ
+Temperature: 14°C
+Humidity: 48%
+Wind Speed: 0.51 m/s
+Description: fog
+--------------------
+```
+
+---
+
+## Error Handling
+
+| Scenario | Behavior |
+|---|---|
+| Empty city input | Prints usage message and exits |
+| City not found (404) | Prints `[404] city not found` |
+| Invalid API key (401) | Prints `[401] Invalid API key` |
+| No internet / network failure | Prints fetch error message |
+
+---
+
+## Tech Stack
+
+- **Node.js** (ES Modules)
+- **node-fetch** — HTTP requests
+- **dotenv** — environment variable management
+- **readline** — interactive terminal input
+
diff --git a/web/Learning-Season/03-backend/challenges/solution/index.js b/web/Learning-Season/03-backend/challenges/solution/index.js
new file mode 100644
index 0000000..8c4828a
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/index.js
@@ -0,0 +1,38 @@
+//Reads cli args, calls the service, passes the result to display. 
+import dotenv from 'dotenv';
+dotenv.config();
+import readline from 'readline';
+import {fetchWeather} from './services/weatherService.js';
+import {displayWeather} from './utils/display.js';
+
+
+async function askCity(){
+    const rl=readline.createInterface({
+        input: process.stdin,
+        output: process.stdout,
+    });
+    return new Promise((resolve)=>{
+        rl.question('Enter city name: ',(city)=>{
+            rl.close();
+            resolve(city.trim());
+        });
+    })
+}
+async function main() {
+    const city= process.argv[2]|| (await askCity());//argv[0]=node, argv[1]=script, argv[2]=first
+    
+    if(!city){
+        console.error('Error: City name cant be empty');
+        process.exit(1);
+    }
+    console.log(`Fetching weather data for ${city}...`);
+    try{
+        const weather= await fetchWeather(city);
+        displayWeather(weather);
+    } catch(err){
+        console.error('Error:',err.message);
+        process.exit(1);
+    }
+}
+
+main();
\ No newline at end of file
diff --git a/web/Learning-Season/03-backend/challenges/solution/package-lock.json b/web/Learning-Season/03-backend/challenges/solution/package-lock.json
new file mode 100644
index 0000000..6e2a53e
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/package-lock.json
@@ -0,0 +1,746 @@
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diff --git a/web/Learning-Season/03-backend/challenges/solution/package.json b/web/Learning-Season/03-backend/challenges/solution/package.json
new file mode 100644
index 0000000..78a39d0
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "solution",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node index.js",
+    "start:algeria": "node index.js Algeria",
+    "start:london": "node index.js London",
+    "start:paris": "node index.js Paris",
+    "start:berlin": "node index.js Berlin",
+    "dev": "nodemon index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "axios": "^1.13.5",
+    "dotenv": "^17.3.1",
+    "node-fetch": "^3.3.2",
+    "nodemon": "^3.1.14"
+  }
+}
diff --git a/web/Learning-Season/03-backend/challenges/solution/services/weatherService.js b/web/Learning-Season/03-backend/challenges/solution/services/weatherService.js
new file mode 100644
index 0000000..3675ee7
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/services/weatherService.js
@@ -0,0 +1,62 @@
+// allowed to make http requests, export the async function. handles all api specific logic.
+'use strict'
+import fetch from 'node-fetch';
+import dotenv from 'dotenv';
+dotenv.config();
+
+const API_KEY= process.env.API_KEY;
+const BASE_URL= process.env.BASE_URL||'https://api.openweathermap.org/data/2.5';
+
+
+if (!API_KEY) {
+    console.error('FATAL: OPENWEATHER_API_KEY is not set in .env');
+    process.exit(1);
+}
+
+//helper
+function buildUrl(city){
+    const params= new URLSearchParams({
+        q: city,
+        appid: API_KEY,
+        units: 'metric',
+    });
+
+    return `${BASE_URL}/weather?${params}`;
+        
+}
+
+function normalizeWeatherData(raw){
+    return{
+        city: raw.name,
+        country: raw.sys.country,
+        temperature: Math.round(raw.main.temp),
+        humidity: raw.main.humidity,
+        windSpeed: raw.wind.speed,
+        description: raw.weather[0].description,
+        windSpeed: raw.wind.speed,
+    }
+}
+
+export async function fetchWeather(city) {
+    try{
+        const url= buildUrl(city);
+        //make request
+        const response= await fetch(url);
+
+        //check http status
+        if(!response.ok){
+            const errBody= await response.json().catch(() => ({}));
+            const message= errBody.message||response.statusText;
+
+            throw new Error(`[${response.status}] ${message}`);
+        }
+
+        //parse json
+        const raw= await response.json();
+        return normalizeWeatherData(raw);
+    } catch(err){
+        //re throw with context so the caller knows what failed
+        throw new Error(`fetchWeather failed: ${err.message}`);
+    }
+}
+
diff --git a/web/Learning-Season/03-backend/challenges/solution/utils/display.js b/web/Learning-Season/03-backend/challenges/solution/utils/display.js
new file mode 100644
index 0000000..8e65f08
--- /dev/null
+++ b/web/Learning-Season/03-backend/challenges/solution/utils/display.js
@@ -0,0 +1,13 @@
+// knows how to format the data and display it in the console. no api specific logic should be here
+'use strict'
+export function displayWeather(data){
+    const divider= '-'.repeat(20);
+    
+    console.log(divider);
+    console.log(`City: ${data.city}, ${data.country}`);
+    console.log(`Temperature: ${data.temperature}°C`);
+    console.log(`Humidity: ${data.humidity}%`);
+    console.log(`Wind Speed: ${data.windSpeed} m/s`);
+    console.log(`Description: ${data.description}`);
+    console.log(divider);
+}
\ No newline at end of file