Atlassian's largest source of income is almost certainly the US.
And even if Australia is unaffected by an American recession, much of Europe, and much of Asia won't be (especially with China's growth slowing down).
Which brings me to my second point, which is the only reason Australia was able to avoid a US recession was selling itself to China, something which it is politically unlikely to do so anymore (although I'm not up to date on the new PM's China policy) and anyways, China may not have the capacity or willingness to support Australia anymore.
And even if Australia is unaffected by an American recession, much of Europe, and much of Asia won't be (especially with China's growth slowing down).
Which brings me to my second point, which is the only reason Australia was able to avoid a US recession was selling itself to China, something which it is politically unlikely to do so anymore (although I'm not up to date on the new PM's China policy) and anyways, China may not have the capacity or willingness to support Australia anymore.