I don't get that. Just do what I did: open a single person company and charge them monthly for your (pre-tax) salary. This has drawbacks like not being protecte

I don't get that. Just do what I did: open a single person company and charge them monthly for your (pre-tax) salary. This has drawbacks like not being protected by the employment laws of the country you live in (are any of us really concerned about losing a job?) but advantages such as having a lot more flexibility tax-wise along with usually very significantly lower tax rates due to you paying yourself via dividends instead of salary, also you can have multiple clients simultaneously if you can handle the workload. Details on tax optimization vary depending on your country of residence and the country where you opened your company. For the "employer" company this is also very simple as they're just paying the invoices you send them.