Builds and instruments the hardware that engineers only ever see as a report.

Somebody has to build the test article, wire in the strain gauges and pressure taps, and get a rig running before an engineer’s analysis can be checked against anything real. Aerospace engineering technicians do that: fabricating and modifying prototypes, setting up instrumentation, and operating the test equipment that turns a design into data. It is a licensed, well-paid trade that does not require a four-year degree.
Aerospace, mechanical or manufacturing technology programmes feed this role directly, in about two years.
Several aerospace primes and test facilities train technicians on the job, paid from day one.
Aerospace Engineering and Operations Technologists and Technicians · US Bureau of Labor Statistics, Occupational Outlook Handbook, May 2024 wages and 2024–34 projections.
You build to a drawing that was not written with your hands in mind, and you are the one who finds out where it does not quite work. Test schedules are set by engineers and programme managers, and the article is often needed faster than it can honestly be built. The work is genuinely physical, and a rig has to be exactly right before anyone trusts the data that comes out of it.