I've noticed a startling lack of any average engineers or scientists who could concievably show up in the actual show. I've found maybe two scientifically oriented OCs, both of which aren't really feasible in the environments they might wind up being used in.

I have one-eh, might not be best. Here he is-
Name- Monkey Wrench
Race-Earth Pony
Gender- Male
Coat Color- Light gray
Mane and tail color- Silver
Mane and tail style- Short and choppy
Eye- Burnt Orange
Cutie Mark- An orange wrench
Backstory- I'll let you give him one.