The double challenge here is doing this all whilst essentially keeping it in the background out of any customer sight. Even if you know exactly what you need af

The double challenge here is doing this all whilst essentially keeping it in the background out of any customer sight. Even if you know exactly what you need after a while from a business perspective, you still need to reimplement it in a way that doesn't cause your product / service / platform to lose customers. I find this always to be an extreme challenge. It's a bit of a treadmill too: doing it this way (without causing breaking changes) certainly takes longer too. So it all piles up into a big messy stack of work :)