How to obtain a long-term residence permit in Germany?

You don't have to go back to China to re-sign, which has nothing to do with any immigration office. There is no immigration office in Germany, and there is only one place to manage foreigners' visas and stay: BH (the abbreviation of bra in German is also this, ha).

Your German company must have its own lawyer. Let the boss sign a work contract with you and leave the rest to the lawyer. The lawyer will tell you what materials you need to provide. Under normal circumstances, 1 month will definitely get a visa.

Of course, you can't get a long sign. You can get a visa for up to two years. It's more likely to be a year. You have to sign it every year after that. Remember to ask your company's lawyer to bring all his formalities, and then you can fill out the form and sign it yourself for the second time (that's what we did). Of course, if your boss is willing to pay you a lawyer's fee every year, you don't have to bother (in fact, it only takes an hour or two to fill out the form, then send the materials to BH and get a visa before running).

You can apply for a long-term visa after living for 5 years, or you can apply for it yourself. The so-called long-term visa is a permanent residence visa, but you have to go to BH to change that visa card every five years.

Congratulations to the landlord. Under the current unemployment rate in Germany, you can get a job as a foreigner. Work hard. Working in Germany is more comfortable than being a boss.