Amusingly, there is literally not even a 7 day work week ban for companies in the US. You can require employees work every day. Employers are just required to pay employees overtime under various conditions beyond 40 hours / five days a week, which is why you don't see it.
And what's more, software engineers are exempt from these rules because of their pay grades. If you're a SWE making a salary the odds are your employer could require you work on Saturdays without running afowl of labor laws.
it's not powered by norms. In the US, if you want to employ someone more than 40 hours you have to give them extra overtime pay. It's called the Fair Labor Standards Act and it was passed in 1938
Unless you are exempt. Guess what profession tends to be considered exempt?
If you are a SWE, you don't get paid overtime for working that incident on the weekend or going over 40 hours in a week. The only reason you work five days a week is tradition.
"Yeah, hello, Peter. What's happening? Listen, um, I'm going to need you to go ahead and come in on Saturday. So, if you could be here around 9, that would be great. Mmhkay? Oh, oh, and I almost forgot. I'm also going to need you to go ahead and come in on Sunday too."
And what's more, software engineers are exempt from these rules because of their pay grades. If you're a SWE making a salary the odds are your employer could require you work on Saturdays without running afowl of labor laws.
This is all powered by norms.