Lukas is exactly right, of course.
It’s not “getting hired at a company” (because it’s always on a self-employed basis) but there also businesses generally known as “prop shops” (proprietary trading firms) where you might get a look-in.
Some are real/physical, others online/virtual.
At most of them, you have to put up some capital of your own (as well as having a good, proven record etc.) to get some degree of backing from them. But many are very scammy businesses, extending you some nominal backing for leverage purposes only, and any losses will be taken from your own funds, not from theirs.
After those, there are also a couple where you don’t need your own capital at all, if you can prove your trading skills to them on one of their demo accounts (which you have to pay a very nominal fee for), but their qualification criteria are pretty tough.
The main thing, as Lukas mentioned, is that you have to convince anyone backing you that your trading is ultra-safe and coming from a place of capital-preservation and risk management, not from aiming for big profits.
In short, the more professional trading is, the more it has to do with risk management and capital preservation.
“How much you can make” doesn’t matter.
What matters is how big your biggest drawdown might be.
Anything over 5% and nobody will ever be letting you trade with their money, on any arrangement at all.
It’s ALL about risk management, when you want to trade OPM.