I worked with someone who described his job like that, working on a suite of actuarial software at an insurance company, originally written in Fortran II someti

I worked with someone who described his job like that, working on a suite of actuarial software at an insurance company, originally written in Fortran II sometime in the early 60s and subsequently ported from system to system in the years that followed. I was involved doing some Y2K work there because I didn't mind playing with Fortran, and part of it involved changing a year field from 2 digits to 4, because who'd have imagined their code would still be in use nearly 40 years later?