It is great feeling, to leave company and leave all your crap code to others :D

500 lines bash generic wrapper to curl (just to catch and print errors, not just silently fail as most devs tell curl to do).

It was monster that used "function overload" and "subclasses" (based on dynamic source files). Also dynamically created inline AWK script to parse curl output. It kinda worked, but amount of high-level hacks I had to use was enormous.

Never use Bash when you do not have to. Even if you have experience with it. Others don't have it and will fail miserably trying to patch your code. Just leave bash for fast bridging between programs, leave python/java/c#/go or any other proper OOP language for a job. Please ?