For long-term employment, you must obtain a residence visa. A residence visa does not automatically grant you a right of residence but allows you to enter Portugal for the purpose of applying for a residence permit, when the requirements are met.
The Ministry of Science, Technology and Higher Education (MCTES) is responsible for granting visas to highly-skilled workers. The online information is found on the website of the Ministry of Foreign Affairs. (Highly qualified subordinate activity)
You must prove that you have an adequate consignment, a work contract or a written proposal.
Residency visas allow two entries and is valid for a period of 4 months. During that time, the holder of a residency visa is required to request a residency permit with the Immigration and Border Services (SEF).
Extended information can be found on Europe's Immigration portal - Portugal
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