embix

Just rewrite it with 80% functionality and force migrations on the users. Once the remaining 20% “edge cases” that require serious effort hop to the next job - where you where hired to “maintain” such a system and “just add a small feature here and there”. Ooops.

all other employers demand modern technologies

There are a lot of employers that’ll throw good money at you for maintaining and extending their outdated crap. Have you ever considered learning COBOL?

And while you’re at it, could you bring some wine and cake to GeoCities?