Temporary Work (Short Stay Specialist) visa – subclass 400.
The subclass 400 visa is for people who want to travel to Australia to do short-term, highly specialised, non-ongoing work. ​
You must be invited, or supported, by the organisation you will be working for, and have specialist skills, knowledge or experience that is needed but cannot be found in Australia.
The normal stay period is up to three months.
The cost for this visa is from about $300.
Source: https://www.homeaffairs.gov.au/trav/visa-1/400-
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