I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
Sometimes there's a part of your code which works but nobody remembers how, something legacy that nobody wants to touch for fear of breaking it.
Fear of fragility is a major reason these bugs go on so long, so periodically revisiting your code or getting another set of eyes on it will go a long way to preventing these sorts of things in the first place.
I have just finished going through this process for an authentication system on a big, sprawling project which was tripping up in various ways but seemed too big to replace. It took a while, and it took me working on a separate branch and having maintenance tickets deflected to other developers for longer than the client wanted, but it's all better now. I can pat it on the head and give it a lollipop.
Incidentally, this is why my Mac is so out of date. It tells me it needs to reboot every day and I deny it because I have no confidence it'll come back up. MacOS has tricked me too many times. At some point I'll wipe it and start from scratch, or get a replacement. But the OS is so fragile that I avoid going anywhere near updates and patches.
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Sometimes there's a part of your code which works but nobody remembers how, something legacy that nobody wants to touch for fear of breaking it.
Fear of fragility is a major reason these bugs go on so long, so periodically revisiting your code or getting another set of eyes on it will go a long way to preventing these sorts of things in the first place.
I have just finished going through this process for an authentication system on a big, sprawling project which was tripping up in various ways but seemed too big to replace. It took a while, and it took me working on a separate branch and having maintenance tickets deflected to other developers for longer than the client wanted, but it's all better now. I can pat it on the head and give it a lollipop.
Incidentally, this is why my Mac is so out of date. It tells me it needs to reboot every day and I deny it because I have no confidence it'll come back up. MacOS has tricked me too many times. At some point I'll wipe it and start from scratch, or get a replacement. But the OS is so fragile that I avoid going anywhere near updates and patches.