Job titles for designing and building small electrical and mechanical systems

[AchillesWrathfulLove]

> A person who works on small scale electrical and mechanical systems
> The design and construction of such systems
> From toys to hand-held devices such as phones

What job titles fit this description?

 

[berkeman]

EE, ME.

 

[CWatters]

Electro mechanical engineer
or
Product design engineer