I used to work on trading systems which were managed in real time by a rotating team of traders (i.e. mathematically oriented people as opposed to software engineers).
You design the system so that if it breaks there are at least workarounds that anyone can employ without needing to write code. For example, a big stop button, manual adjustments, manual trading, etc.
Maybe it stops printing money overnight and you take an opportunity cost loss. That's fine, post mortem at work, fix it.
In the worst case if you're not available then someone with ownership steps in like a CTO/founder level (who are of course always on call almost by definition, though they generally have the executive power to say - sod this, we'll just leave it down for a while).