In the UK many companies' full time hours are 36-37.5 instead of 40 (still 5 days a week). I know that's not really what you're asking for, just wanted to point out that 40 and above isn't the norm everywhere.

Any software engineering job can have reasonable hours if you pace yourself and set boundaries

My company has a 34 hour, four day workweek. We are looking for a Golang dev. Civo.com/careers

There’s a web app for that:

https://4dayweek.io/