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There’s a moment when you’re idly scrolling a running service’s logs and your hand stops. That day, I hit that moment in the audit logs of A11y Check, a web accessibility auditing service. Two audits had been stuck “scanning” for hours. Not in progress, not failed — just stuck. This is what people call a zombie task: a job left in the queue, neither dead nor alive. This is the story of catching those two zombies, of two fixes I was sure of missing, and of finding the real cause only on the third try. To skip to the end: the culprit wasn’t my logic but Vercel’s Deployment Protection — or more precisely, my internal-call code that didn’t account for it. ...

Sound Familiar? 3 PM. Your phone rings, right on schedule. “I posted an announcement on the website, but the text looks weird. There are question marks everywhere.” The person on the other end insists they “just typed it normally, nothing special.” But if you’ve dealt with Korean systems long enough, you already know where this is going. A few more questions confirm it: they copied and pasted from an HWP document directly into the web editor. It looked fine in the preview. But after saving, this is what appeared on screen: ...