Being able to release safely during the week is super important for eg financial services, for fairly obvious reasons.

In trading and market making contexts for instance, we release 100s of times a day — including Fridays. This includes bog-standard infra changes like roleswaps and server rebuilds. The releases that happen on weekends tend to be highly disruptive infra changes, eg unexpected changes to some kind of physical connectivity where we’re not comfortable with carrying weekday risk.

We didn’t explicitly set to to optimise QoL for engineers (the real driver for safe intraday change was being responsive as a business) but not usually being on call on weekends was a big plus.