Hi Douglas, I've just registered here to reply to this. You seem to be in a similar position to myself before I came to Australia. I have worked in IT for over 10 years in the UK, albeit at L2 service desk support and for the last 5 years within service desk management. Before I came to Australia I saw online that there were lots of jobs that I could apply for based on my experience which is true there is plently of IT work here and that was a large factor in me moving here. I have found it difficult to seek permanent employment due to being on a 417.
What I would advise if that if you do arrive in Aus and start applying for jobs focus on applying for contract/temp roles, employers aren't that interested in taking someone on who can only work for them for 6 mnths into a perm position. I have had so many kickbacks from employers who have said "yeah, we are really interested but your visa is an issue"
Focus on getting a 3 - 6 mnth contract role and work like hell, hopefully you'll land in a position where they would then like to take you on via sponsorship and as the previous person said, 12 mnths is a good timeframe to find a suitable employer and to get sponsored. At your age as also advised you can go and do the rural work and get a 2nd year extn. Some advice I got too late was to do the 88 days of work when you 1st get here, you then will have 1 year and 9 mnths to find a sponsor.
I know all of this seems pretty obvious but I spent the 1st mnth applying for jobs I was sure I would get only to be kicked back due to my 417 visa, as soon as I focused on contract/temp roles I got a job in 7-10 days.
But you can work for any 1 employer for a max of 6 mnths.
Hope this is useful! Thanks