Start your own company? But even that I think is futile.
The causes of manure code are usually out of your control - tight deadlines; new devs touching stuff without properly understanding the whole; organization prioritizing short-term reward over long-term sustainability.
You also have to consider the inherent survivorship bias - only successful businesses live long enough that their codebase has time to grow into a big mess. Any company that lives more than a few years inevitably ends up with "manure". You'd have to be in the extremely rare position where you are profitable and have no pressure to keep growing (investors) in order to invest enough time into technical craft to not end up with manure code.
The causes of manure code are usually out of your control - tight deadlines; new devs touching stuff without properly understanding the whole; organization prioritizing short-term reward over long-term sustainability.
You also have to consider the inherent survivorship bias - only successful businesses live long enough that their codebase has time to grow into a big mess. Any company that lives more than a few years inevitably ends up with "manure". You'd have to be in the extremely rare position where you are profitable and have no pressure to keep growing (investors) in order to invest enough time into technical craft to not end up with manure code.