A worker who employs their own employees at the work site, conducts their own business, is not subject to control as to how work is performed, and whose formal arrangements lack the indicia of employment (tax deductions, leave, superannuation) is an independent contractor notwithstanding a high degree of control exercised over what work is to be done and when. An employer's duty of care (or equivalent duty to an independent contractor under Stevens v Brodribb) does not extend to risks that the employer did not know and could not reasonably have known about, including the specific method of work chosen by the worker and the worker's fitness to perform that work.
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