Curated developer articles, tutorials, and guides — auto-updated hourly


It started with one Sentry alert on a Tuesday night: ServerError: An internal error has occurred....


One click on "Place order." Two rows in the orders table, created 40 milliseconds apart, identical.....


When an AI agent patches a race condition with a hard-coded delay, CI passes and production degrades...


Every DNS lookup in my k3s cluster was appending 'home.lan' and recursing externally. I blamed DHCP,...


My Mac mini has a 256 GB disk. On 11 October it had 70 GB free, which is fine until you want Xcode.....


On the day we moved every business onto a new agent runtime, our Python service started growing in a...


To share a HAR file safely, start by deciding whether a public discussion needs the file at all....


Go's goroutineleak profile reuses the GC mark phase to find goroutines nothing can wake. How the tri...


Your deployment rolled out. Thirty seconds later, kubectl get pods shows CrashLoopBackOff and a...


You ask ChatGPT for a config snippet. You copy it, paste it into your editor, and compare it with th...


When an AI coding agent writes tests, it often mocks the module under test. The test passes because ...


A long Slack chat.postMessage request was stored as two messages. The API returned the second messag...


Two Clocks, One Agent Trace If a span record carries both a wall-clock timestamp and a...


The report QA filed this against our internal business web app (React + Vite): The...


AI didn't make our new developers worse. It made them unfinished, and nobody noticed until productio...


Last weekend, Visual Pinball on Android stopped loading pinball tables out of nowhere. Not all of...


A debugging war-story about async def, a blocking call, and the event-loop trap that makes a fast fr...


A user clicks log out, switches to their other tab, and is still signed in. You cannot reproduce it,...


Why an agent renames an identifier cleanly across the symbol graph yet leaves the legacy name in err...


The command tool did the sensible thing. It got a name — "John" — matched it against three people,.....


Why an agent reaches for a broad swallow instead of fixing the root validation, why a green suite mi...


Every contact form submission in production returned an error, and the form code was fine. Two traps...


An agent converted a sequential row-processing loop to Promise.all. Tests passed. The logs started a...


I work a QA desk where agents (mostly) deliver and I sign off. Before I sign, I do exactly one thing...