I spent a few weeks migrating and then fixing a bunch of bugs in 20-year old Perl codebase (cyber security had their sights set on it). Basically used by a huge

I spent a few weeks migrating and then fixing a bunch of bugs in 20-year old Perl codebase (cyber security had their sights set on it). Basically used by a huge amount of people to record data for all kinds of processes at work. Original developer is long gone. Me and another guy are two of the only people (we aren't a tech company) who can re-learn Perl, upgrade multiple versions of Linux/Apache/MySQL, make everything else work like Kerberos etc... Or maybe I'm one of the only people dumb enough to take it on. Either way, nobody will get so much as an attaboy at the next department meeting. But, they'll know who to go to the next time some other project is resurrected from the depths of hell and needs to be brought up to date.