Portugal job market

Hi all, I have some questions regarding jobs in Portugal.

I was going through the adverts and I have noticed they are all missing a salary - is it normal? How would I know what they are offering? Would they respond with a salary if I just email them?

Are there international companies in Portugal where working language would be English rather than Portuguese?

How do Portuguese companies look at working from home? Is coming to the office once a week an option? I am referring to more senior positions.