Currently working on a project like this. It's a 20 year old codebase, so it's gotten so bad that we spend 2 weeks planning something that could take me 1 week

Currently working on a project like this. It's a 20 year old codebase, so it's gotten so bad that we spend 2 weeks planning something that could take me 1 week to write in the current codebase or 1 day to write in a sane codebase, on a product that I could probably re-write from scratch in a month.