Well - my "hobby" project is running the league website for a pool hall that was written in PHP ~12 years ago. There are 4 different leagues, each on their own database, all running very similar (but not the same) versions of the code on similar but not the same db schemas.
So I'm trying to modernize it by building a separate app that can interoperate with the 4 different schemas and do all the same things that the old app did. It's an interesting exercise in replacing legacy code piece by piece while still using it (all the leagues would not function if the site didn't work, and there's basically 3 weeks out of the year when the leagues aren't playing).
Professionally, on the other hand, I work at a startup where I've more or less had my hands in the code from day one.
