Sebastian Torres / Full Stack Developer / Ingeniero Informático

// sync order status from marketplace
function syncOrders($db, $orders) {
  foreach ($orders as $o) {
-   $db->query("UPDATE orders SET st='new'");
+   $stmt = $db->prepare(UPDATE_STATUS);
+   $stmt->execute([$o['status'], $o['id']]);
  }
  return notifyWarehouse($orders);
}

// gateway: auth, limits, versioning
const app = express();
- app.use('/api', routes);
+ app.use(helmet(), cors({ origin: ALLOWED }));
+ app.use('/api', rateLimit({ max: 100 }));
+ app.use('/api/v1', requireApiKey, routes);
app.listen(process.env.PORT);

-- audit: slow lookup on 40k rows
SELECT * FROM sales
  WHERE sku = 'BRK-2231';
- -- full table scan
+ CREATE INDEX idx_sales_sku
+   ON sales (sku, created_at);
+ -- 1 indexed range read

<head>
- <title>Home</title>
+ <title>Auto Parts · Fast US Shipping</title>
+ <meta name="description" content="...">
</head>
<main class="grid md:grid-cols-3 gap-6">
  <img loading="lazy" alt="Brake kit">
</main>

class ProductSync {
  public function push(array $items): void {
    foreach ($items as $item) {
-     $this->http->post('/items', $item);
+     $res = $this->http->put("/items/{$item['sku']}",
+       ['price' => $item['price'], 'qty' => $item['stock']]);
+     if ($res->status() !== 200) $this->retry($item);
    }
  }
}

# push only changed stock to the API
import requests

def sync_stock(items):
-   for i in items: update(i)
+   batch = [i for i in items if i["changed"]]
+   r = requests.post(API_URL, json=batch, timeout=10)
+   r.raise_for_status()
    return len(batch)