There are 63 mainframes (insourced and outsourced) in Australia and they aren’t going anywhere soon.
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.
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Westpac, the Reserve Bank of Australia, Harvey Nash, Suncorp, a number of government agencies
and Bankwest are all currently seeking people with mainframe experience.
Any Aussie System Z guys looking for employment?
https://www.cio.com.au/article/633869/last-mainframers-big-iron-big-crisis/