What was Carlos's job?

Looking back at the series, I find it interesting that of the 4 women, Gabrielle was the most materialistic and most well-off, with many plotlines revolving around money or the lack of it. Yet, she is the one where we don't know much about where that money came from. We know Carlos had high-earning corporate jobs, but besides that we really don't know what he was actually doing. Was the a finance guy? A business major? Data analytics? In marketing? (probably not because then he wouldn't have hired Lynette, another marketing professional). He was described as a "shark" (ruthless businessman) multiple times in the series and looking back, I find it funny that we never really knew what he actually did, or what industry he even worked in.

And this is even more interesting when we have such a clear understanding of how other characters made their money:
Susanne - children's book illustrations + Mike - plumber
Bree - Doctor husbands, family money and then later the catering business
Lynette - Marketing executive and later restaurant owner.

And then we have Gabrielle an ex-model and eventual personal shopper, and Carlos taking care of her. Except he is the only one where we don't have a clear idea of what he did except the general "he was a businessman" blanket. And he was a masseur for that short time.