You Fixed One Bug and Broke Three Others

🧠 Daily Dev Motivation — 2026-08-08
You Fixed One Bug and Broke Three Others
It started simple. A user reported that file uploads over 10MB were failing silently — no error message, no retry, just a spinner that eventually timed out. You find the issue quickly: the middleware that enforces upload size limits has a bug where it returns a 200 with an empty body instead of a proper 413. Five minutes of work. You patch the middleware to return the correct status code, write a test that reproduces the 10MB scenario, watch it pass, commit, and push.

The CI turns green. You merge it.

Three hours later, the monitoring dashboard lights up like a Christmas tree. The mobile app is getting 413 errors on profile photo uploads. You check the code — the mobile app uploads avatars as part of the user profile endpoint, which reuses the same middleware. The mobile app's photos are compressed to around 3-4MB, which should be fine. But you just changed the threshold calculation from "file size in bytes" to "payload size including headers and multipart boundaries," and the multipart overhead for a 4MB photo with a large auth token and metadata pushes it over. You didn't break the logic — you fixed the logic, and the logic was more correct than the system could handle.

You roll back. The monitoring dashboard goes green. You open the issue again and realize you can't just fix the size check — you need to fix the size check AND update the mobile client's upload logic AND change the middleware to handle the threshold differently for different endpoints AND add proper error messages for every case.

Five minutes became five hours. And you know the worst part: when you eventually land the right fix, something else is going to break because someone depends on the old, wrong behavior.

... [full post saved locally]

"A bug fix that doesn't have a test is just a promise you'll forget you made."

#devmotivation #shipit #codebetter