while i worked for money ( as most of us have to do )
i sell, designed, configured, tested, trained on
DCS Distributed Control Systems ( or Process Control Systems )
for many years, in many countries, living in dirty hotels and work on horrible construction sites, training

• ex rice farmers to run a chemical production plant.
• and electricians to do instrumentation, computer and networks
• and windows game specialists to keep the computer system running.

but the engineering work i loved, so now retired i found i still do the same work, just as a hobby.
ok, the computer equipment is smaller / from room size to palm.