Patterns, principles, and practices
for building scalable applications
2026.03.18
A well-designed architecture separates concerns into distinct layers, enabling teams to work independently while maintaining system coherence. Each layer has clear responsibilities and well-defined interfaces.
Any fool can write code that a computer can understand.
Good programmers write code that humans can understand.
— Martin Fowler, Refactoring (1999)
Sub-100ms response times with edge caching and optimized database queries across all endpoints.
Zero-trust architecture with end-to-end encryption, RBAC, and automated vulnerability scanning.
Horizontal auto-scaling from 10 to 10,000 concurrent users with no configuration changes.
Response time improvement over 5 quarters (ms)
import express from 'express';
import { rateLimit } from 'express-rate-limit';
const app = express();
// Middleware: rate limiting
const limiter = rateLimit({
windowMs: 15 * 60 * 1000,
max: 100,
message: { error: 'Too many requests' }
});
app.use('/api', limiter);
// Route handler with async/await
app.get('/api/users/:id', async (req, res) => {
try {
const user = await db.users.findById(req.params.id);
if (!user) {
return res.status(404).json({ error: 'Not found' });
}
res.json({ data: user });
} catch (err) {
console.error('Fetch failed:', err.message);
res.status(500).json({ error: 'Internal error' });
}
});
app.listen(3000, () => console.log('Listening on :3000'));