Here are some quick facts to get you started:
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​Employment in Germany: Involves high employer costs and termination is hard.

Onboarding: The onboarding process typically takes around 22 days.

Leave: Germany offers a minimum of 20 working days paid annual leave, exclusive of public holidays.

Payroll & Tax: The payroll cycle is monthly.

You can use the OmniAtlas for more information and to compare hiring in different countries.