Strangely enough; unionization could actually facilitate this in a better way. If the trade union and not labour union model was used.
In a trade union, you contact the union and request a number of qualified skilled workers for the job; they do the job on contract and leave. So if you were renovating a building you might contact the Electrician union and get 3 Master Electricians and 5 Journeymen to do a job. They'll come and do the wiring, and you pay their union rate and when the job is over they're employment ends. The union takes care of benefits. If Jack shows up and you hate him you fire him and get a different person from the union. The union polices the skill of their members, and provides benefits from their dues.
So you would call the IT union and get your certified IT workers to complete the job and you pay the union rates. Of course, to square this analogy we might have to get licensed architects for the design to start with too. Maybe we take this further and the designs have to be signed of on by a PE and filed for reference too, so no more do you have confidential system architecture; for the public good needs to be regulated for safety. And then the system inspectors have to approve in test as well.
The more I think about this the more I expect that there will be a trade union for these type jobs; it solves many issues; at least as many for the companies as for the workers.