You can write you proposal and budget and post it on Marketplace.
But if a company is big enough and it’s in a country with strong work and employments laws, it’s a full time job with a giant team just to keep up with it, because:
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You have thousands of employees
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Everyone have different working hours, vacation days, sick days, overtime, etc. Also this changes every day.
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New laws come and go every year
Why would you invest time doing this twice?