> The important part of this is that I never be under any illusion that I something that I toss together and make capable of ‘running’ be definitive code that can be put into production or used as-is, and that under no circumstances must the coders have any bright ideas about fudging the underlying mathematics.

But there should be some cross germination between you and your coders? You must have learned ways to make your spaghetti code less cumbersome for them and they probably have learned something about the underlying economics so that they know what it is you’re doing and how to keep everything to your needs. Similarly you’re not reinventing the wheel each time so you must be using tools developed by them more and more as time goes on?