MOSTLY AI Inc. (USA) uses ADP Total Source as a Professional Employer Organization in the USA for services such as payroll, https://mostly-ai.atlassian.net/wiki/spaces/Public/pages/897125427 and compliance.
If you are hired in the USA:
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always keep your profile up to date on ADP (ex. address, phone number, tax info, etc)
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become familiar with its “Basic Employment Policies” below: