This probably wouldn't translate well to software. But it works great if you are installing ducts. Same goes for plumbers and electricians. My sisters first husband was a union electrician. That is why I looked into getting a union gig. I hate job hunting.
In the years I did it I worked for five different companies. I didn't have to run around dropping off resumes and doing practice tests. I just got a call from the union and was told where to go to work. And I made significantly more than my non-union counterparts. Easily more than the dues I had to pay.