Blog

Shopify replaced Redis with MySQL SKIP LOCKED for inventory reservations. DoorDash replaced Redis Cluster with stateless Kvrocks. The lesson isn't "Redis is bad" — it's about matching infrastructure to access patterns.

Redis does more; Memcached does one thing faster. Here's exactly when that trade-off matters — plus why Valkey is now the open-source default in 2026.

Prisma 7 eliminated the Rust binary and closed the performance gap. So why are teams still choosing Drizzle? The real answer is about SQL transparency, bundle size, and who owns complexity.

Client-side validation is UX. Server-side validation is security. And a schema is not an auth guard — here's the fix that still ships an account takeover, and how to catch it in review.

A monotonic stack maintains elements in order and pops when that order breaks — finding the next greater element for every popped value in O(n) total.

Reading a 2 GB file all at once doesn't run out of memory — it hits V8's 512 MB string limit first. Streams process it in flat memory instead. Here's the pipeline pattern, custom Transform streams, and backpressure, with the numbers measured on Node 22.

The EventEmitter pattern lets components in the same process react to the same event without being directly coupled — no message broker needed.

One file to guard every route — plus the Next.js 16 rename that moves it off the Edge runtime, the request-vs-response header trap that leaks user IDs to the browser, and the CVE that explains why this can never be your only auth layer.

Node.js runs on one CPU core by default. The cluster module lets you fork N workers across all cores — here's the pattern, graceful shutdown, IPC, and when PM2 makes it unnecessary.