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At most tech companies, you can work 5 hours per week or 100 and your salary remains the same. If they see you working 5 hours per week and don't think you're productive enough, they can fire you, but you aren't paid any more for working more hours. That's what "salaried" means. It's why you've never heard someone getting paid "time and a half" for working weekends in tech.
It depends on the state. In California there are minimum salary requirements, that are adjusted every year, that must be met to be an exempt position. Otherwise you are required to pay hourly.
It's honestly one of the nice features of the state.