Australian Worker in a Specialty Occupation
The E-3 is a visa category only for Australians coming to the U.S. to work temporarily in a specialty occupation.
This classification currently applies only to nationals of Australia as well as their spouses and children. E-3 principal applicants must be coming to the United States solely to work in a specialty occupation. The spouse and children need not be Australian citizens. However the U.S. does not recognize De Facto relationships or same-sex Civil Partnerships for the purposes of immigration, and to qualify as a spouse you will need a marriage certificate from the Department of Births, Deaths and Marriages.
E-3 Applications: no earlier than 6 months in advance but no later than 1 1/2 month prior to the status expiration date/start of employment.