Melbourne is easily the worst city in the country for this. Most of the tech sector is in the very large enterprise space lead by the banks, and as a result it's who you know and whether you went to Melbourne Grammar or Geelong Grammar that will determine which company you work for once you reach a certain level. Sydney is better just because there's more smaller stuff going on, and because CBA is better than NAB and ANZ combined on tech. (I hate Sydney otherwise and am based out of Melbourne)

Some places in Melbourne get real work done, even in the data sector. They're hard to find, but they exist.