Here are some quick facts to get you started:
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​Employment in Spain: Involves average employer costs and termination is very complex.

Onboarding: The onboarding process typically takes around 16 days.

Leave: Spain offers a minimum of 30 calendar days (approximately 23 working days) paid annual leave.

Payroll & Tax: The payroll cycle is monthly.

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