1️⃣ Problem
Explain:
Frontend hosted on Vercel

Backend hosted on Railway
Browser blocks cross-origin requests

2️⃣ CORS Configuration (Code Snippet)
Node/Express example:

app.use(cors({
origin: 'https://your-frontend.vercel.app',
credentials: true
}));

3️⃣ Production Considerations

Do not use "*"

Environment-based origin config

Secure headers

4️⃣ Deployment Diagram

Below is simple ASCII diagram:

User Browser
↓
Vercel (Angular Frontend)
↓ HTTPS
Railway (Node API)
↓
MongoDB Atlas

The above diagram alone elevates how the system was built

🎯 5️⃣ Strategic Upgrade Recommendation

“Architecture Mindset below :-”

Separation of Concerns

Secure-by-Default Configuration

Cloud-Ready Deployment Patterns