Tutorials, stack comparisons, tool reviews, and productivity tips — code that ships.
Most websites ship 2 MB hero images for slots that render at 600 px wide. The fix is half configuration and half discipline: a CDN that does on-the-fly format negotiation, srcset that picks the right size, and the four `<img>` attributes that move every PageSpeed metric.
Kafka and RabbitMQ both move messages and are not interchangeable. One is a distributed log, the other is a message router. Picking the wrong one means a year of fighting the abstractions. Here is the workload-based decision tree, the operational realities of each, and the rare case where you need both.
The UUID-vs-bigint debate is religious in some teams and absent in others. The numbers behind it are surprisingly clean: random UUIDs cost 30%+ more disk and a measurable insert-time penalty, but UUID v7 (time-ordered) closes most of the gap. Here is the data, the patterns each fits, and the “use both” design that ends the argument.
Most performance investigations start with “let's add some console.time calls” and end with three days of guessing. Flame graphs are the visualization that takes you from “the API is slow” to “line 142 is the problem” in one capture. Here is how to read one, generate one in Node.js, and the four shapes that tell you what kind of bug you are looking at.
Postgres has two replication systems and most teams cannot articulate the difference. Streaming gives you a hot standby identical to the primary; logical lets you replicate selected tables to a different schema or major version. Here is the decision tree, the operational gotchas of each, and a realistic answer for which one you actually need.
Most TypeScript domain models are a single interface with twenty optional fields, half of which are mutually exclusive. Discriminated unions are the feature that turns that into the actual shape of the data, and lets the compiler narrow precisely. Here is the pattern, applied to four real domain shapes.
A default ESLint config has 80 rules and most of them are noise. The ones worth their CI cost catch real bugs: async without await, exhaustive switches, no-floating-promises. Here are the twelve I turn on for every TypeScript project, and the four I turn off because they cause more harm than good.
Most developers learn SQL aggregations, hit a wall, and pull data into the application to compute running totals or per-group ranks. Window functions are the SQL feature that replaces that round trip with one query, and most teams use less than 10% of what they can do.
SemVer is simple on paper and dishonest in practice. Most maintainers ship breaking changes in patches and call it "a bug fix." Here is what each version part actually means, the four kinds of changes that look like patches but aren't, and the deprecation playbook that lets you evolve a public API without breaking the world.
Most teams install Husky, configure ten pre-commit checks, and disable the whole thing within a month because commits take 30 seconds. Here is the minimal pre-commit setup that catches real bugs, runs in under 2 seconds on the changed files only, and does not need a `--no-verify` workaround.