The Australian company need to prove that there are no available Australian or Australian PR to fill the job for a reasonable amount of time. Same as all other countries. So unless yor job is very skillful or niche, chances are slim. There are alot of unemployed Australians looking for jobs in the market

Talk to an agent first to see what are the components you need to do the visa?? You can check out my agent if you want to.  I am applying my PR with them.  Migration Avenue -  www.migrationavenue.com

I also thought about getting a work visa first (so at least got job waiting there mah), but after consulting and find out about the differences between work visa holder and PR holder, I think applying your own PR is worth the investment lah...

If the company in Australia wants to hire you, you can get your employer sponsored visa (457) within 3-4 months which can last you for 4 years before it expires.

Nope, 8 months. Hence I'll have to get my ACS skill assessment done. (Which I already did)

To qualify for Employer sponsorship, you either need to:

-Work in Australia for 2 years (including 1 year in the current company)
-Get a positive skill assessment from your occupation's governing body in Australia. (In my case, ACS - Australian Computing Society) .You can circumvent the 2 years policy in this case.

And most importantly, a willing Employer.

Employer sponsorship has the highest priority in the migration list. (Got a colleague who got his PR in a week!). But in most cases, PR is usually granted anywhere between 3 to 6 months.

I think the lengthy process is where you need to get all your reference letters from your previous employment and have them certified.

457 Visa and Employer Nomination Scheme - ENS (121/856) visa are 2 different visas. 457 is a temporary business visa and expires after 4 years. You are tied to the company and you don't get the benefits of a PR. It's the fastest way an Australian employer can get you to work with them.

ENS visa on the other hand is a permanent visa (PR) and once you get it, well you're considered a PR and don't have any work restrictions and obligations to your sponsoring company. This visa is not a given once you've worked with the company and it's based on the sole discretion of the company to sponsor your ENS. In fact, most companies are unwilling to sponsor your PR as they know there's a high chance of you leaving them once you've got your PR. Usually, if you're in a niche skill trade / bring lots of profit to the company / hard to replace someone with your skillset then they'll sponsor your PR.