Can I streak my hair purple......?

Question

........ if I'm interning as an engineer in a very professional workplace?

Answer 1

I wouldn't.

Answer 2

i don't think so

Answer 3

you would need to ask your work.

Added: An employer can discriminate on how you look.  They are called "Dress Codes".

Answer 4

An employer can't discriminate you on the basis of how you look. But they may be less inclined to hire you in the fist place. I would consult them before you did it.