🟢 Node.js

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// Modern Node.js Architecture
import express, { Express, Request, Response, NextFunction } from 'express';
import { Server as SocketIO } from 'socket.io';
import Redis from 'ioredis';

const app: Express = express();
const redis = new Redis(process.env.REDIS_URL);

// Middleware chain
app.use(helmet());
app.use(cors());
app.use(rateLimiter);
app.use(requestLogger);
app.use(authenticate);

// Type-safe routes
interface CreateDocumentBody {
  title: string;
  content: string;
  metadata?: Record<string, unknown>;
}

app.post('/api/documents', 
  validate(CreateDocumentSchema),
  async (req: Request<{}, {}, CreateDocumentBody>, res: Response) => {
    const document = await documentService.create(req.body);
    
    // Real-time notification
    io.to(`user:${req.user.id}`).emit('document:created', document);
    
    res.status(201).json(document);
  }
);

// Graceful shutdown
process.on('SIGTERM', async () => {
  await server.close();
  await redis.quit();
  process.exit(0);
});